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どちらが速いですか？ foreach vs. List.ForEachと forループ

今日（ 翻訳者のメモ： 6年前）、foreachコンストラクトを使用してリストをソートし、少し満足して、それがどれほど効率的で、何であるかを認識して、ArrayListを使用してみました。 Genericの奇跡のおかげで、C＃コンパイラSystem.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
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, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

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: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

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, . ForEach .インスタンスを使用して、多数のパッケージ化操作をきちんと回避しますSystem.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
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, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

:
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: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

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, . ForEach . System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
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, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

:
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:
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: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

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, . ForEach .
 System.Collections.Generic.IEnumerator   System.Collections.IEnumerator .   : "     ?"   , , , ,     . 
  
 NET Framework 2.0 ( . : ,  )   ,    ,   .   ,      ,   Action, Converter<TInput,TOutput>   Predicate,    .   ,   .    ,        .  ,    List.ForEach(Action).   , ForEach ,           Foreach? 
   : 
 long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; } 
  C#   IL     ,    : 
 long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; } 
  ,  C #       : IEnumerator .MoveNext ()  IEnumerator .Current.   List.Enumerator (  IEnumerator)     IL   callvirt,        . 
  ,   : 
 long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; }    ,    : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; } 
 
  ,  List.ForEach      ,  Action<>  ,   .    callvirt IL ,    ,   callvirt. ,  ,  List.ForEach     . 
   ,     ,        List     : 
 for (int i = 0; i < List.Count; i++) 
 for (int i = 0; i < NUM_ITEMS; i++) 
 foreach (int i in List) 
 List.ForEach(delegate(int i) { result += i; }); 
 
 ,      : 
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   . ,   ,  List.ForEach  ,   !    ,  (  ) Foreach    ,   . ,    ,   ,  List.ForEach    . 
 ,        ,      " ": 
 画像 
    ,      ,     ,   ,  50% . ForEach-     20%. List.ForEach    ,  ,   -  Foreach-   . List.ForEach ,   Foreach. 
 
 ,       Dell Inspiron 9400  Core Duo T2400  2   .        ,      : ForEachTest.zip (3,82 ). 
        ,    ,      .    5  ,   10000000  50000000  . 
 
   : 
 画像 
 
   : 
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  :      ForEach     List,       .  Array.ForEach     ( )      ,    foreach.   ,     ,  IEnumerator  foreach-  .  ,     IL,      .  ,  foreach  ,     ,     Array.ForEach       . 
 
  : 
 ..     Unity3D   C#,            .     using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } } 
 
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  ,           .   ForEach    .
System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

, :
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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
画像
, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

:
画像

:
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: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

, , , 1000 . 1000 , . , , .
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, . ForEach .
 System.Collections.Generic.IEnumerator   System.Collections.IEnumerator .   : "     ?"   , , , ,     . 
  
 NET Framework 2.0 ( . : ,  )   ,    ,   .   ,      ,   Action, Converter<TInput,TOutput>   Predicate,    .   ,   .    ,        .  ,    List.ForEach(Action).   , ForEach ,           Foreach? 
   : 
 long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; } 
  C#   IL     ,    : 
 long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; } 
  ,  C #       : IEnumerator .MoveNext ()  IEnumerator .Current.   List.Enumerator (  IEnumerator)     IL   callvirt,        . 
  ,   : 
 long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; }    ,    : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; } 
 
  ,  List.ForEach      ,  Action<>  ,   .    callvirt IL ,    ,   callvirt. ,  ,  List.ForEach     . 
   ,     ,        List     : 
 for (int i = 0; i < List.Count; i++) 
 for (int i = 0; i < NUM_ITEMS; i++) 
 foreach (int i in List) 
 List.ForEach(delegate(int i) { result += i; }); 
 
 ,      : 
 画像 
   . ,   ,  List.ForEach  ,   !    ,  (  ) Foreach    ,   . ,    ,   ,  List.ForEach    . 
 ,        ,      " ": 
 画像 
    ,      ,     ,   ,  50% . ForEach-     20%. List.ForEach    ,  ,   -  Foreach-   . List.ForEach ,   Foreach. 
 
 ,       Dell Inspiron 9400  Core Duo T2400  2   .        ,      : ForEachTest.zip (3,82 ). 
        ,    ,      .    5  ,   10000000  50000000  . 
 
   : 
 画像 
 
   : 
 画像 
 
  :      ForEach     List,       .  Array.ForEach     ( )      ,    foreach.   ,     ,  IEnumerator  foreach-  .  ,     IL,      .  ,  foreach  ,     ,     Array.ForEach       . 
 
  : 
 ..     Unity3D   C#,            .     using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } } 
 
  ,        ,   ,       1000  .       1000 ,    .          ,    ,    . 
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  ,           .   ForEach    .
System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

, :
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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
画像
, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

:
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:
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: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

, , , 1000 . 1000 , . , , .
:
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, . ForEach .
 System.Collections.Generic.IEnumerator   System.Collections.IEnumerator .   : "     ?"   , , , ,     . 
  
 NET Framework 2.0 ( . : ,  )   ,    ,   .   ,      ,   Action, Converter<TInput,TOutput>   Predicate,    .   ,   .    ,        .  ,    List.ForEach(Action).   , ForEach ,           Foreach? 
   : 
 long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; } 
  C#   IL     ,    : 
 long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; } 
  ,  C #       : IEnumerator .MoveNext ()  IEnumerator .Current.   List.Enumerator (  IEnumerator)     IL   callvirt,        . 
  ,   : 
 long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; }    ,    : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; } 
 
  ,  List.ForEach      ,  Action<>  ,   .    callvirt IL ,    ,   callvirt. ,  ,  List.ForEach     . 
   ,     ,        List     : 
 for (int i = 0; i < List.Count; i++) 
 for (int i = 0; i < NUM_ITEMS; i++) 
 foreach (int i in List) 
 List.ForEach(delegate(int i) { result += i; }); 
 
 ,      : 
 画像 
   . ,   ,  List.ForEach  ,   !    ,  (  ) Foreach    ,   . ,    ,   ,  List.ForEach    . 
 ,        ,      " ": 
 画像 
    ,      ,     ,   ,  50% . ForEach-     20%. List.ForEach    ,  ,   -  Foreach-   . List.ForEach ,   Foreach. 
 
 ,       Dell Inspiron 9400  Core Duo T2400  2   .        ,      : ForEachTest.zip (3,82 ). 
        ,    ,      .    5  ,   10000000  50000000  . 
 
   : 
 画像 
 
   : 
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  :      ForEach     List,       .  Array.ForEach     ( )      ,    foreach.   ,     ,  IEnumerator  foreach-  .  ,     IL,      .  ,  foreach  ,     ,     Array.ForEach       . 
 
  : 
 ..     Unity3D   C#,            .     using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } } 
 
  ,        ,   ,       1000  .       1000 ,    .          ,    ,    . 
     : 
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  ,           .   ForEach    .
System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
:
long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
C# IL , :
long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
, C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
, :
long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

, List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
, , List :
for (int i = 0; i < List.Count; i++)
for (int i = 0; i < NUM_ITEMS; i++)
foreach (int i in List)
List.ForEach(delegate(int i) { result += i; });

, :
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. , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
, , " ":
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, , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

, Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
, , . 5 , 10000000 50000000 .

:
画像

:
画像

: ForEach List, . Array.ForEach ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

:
.. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

, , , 1000 . 1000 , . , , .
:
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, . ForEach .
  1. System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

    NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
    :
    long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
    C# IL , :
    long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
    , C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
    , :
    long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

    , List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
    , , List :
    for (int i = 0; i < List.Count; i++)
    for (int i = 0; i < NUM_ITEMS; i++)
    foreach (int i in List)
    List.ForEach(delegate(int i) { result += i; });

    , :
    画像
    . , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
    , , " ":
    画像
    , , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

    , Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
    , , . 5 , 10000000 50000000 .

    :
    画像

    :
    画像

    : ForEach List, . Array.ForEach     ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

    :
    .. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

    , , , 1000 . 1000 , . , , .
    :
    画像
    , . ForEach .
    System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

    NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
    :
    long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
    C# IL , :
    long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
    , C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
    , :
    long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

    , List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
    , , List :
    for (int i = 0; i < List.Count; i++)
    for (int i = 0; i < NUM_ITEMS; i++)
    foreach (int i in List)
    List.ForEach(delegate(int i) { result += i; });

    , :
    画像
    . , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
    , , " ":
    画像
    , , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

    , Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
    , , . 5 , 10000000 50000000 .

    :
    画像

    :
    画像

    : ForEach List, . Array.ForEach     ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

    :
    .. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

    , , , 1000 . 1000 , . , , .
    :
    画像
    , . ForEach .
     System.Collections.Generic.IEnumerator   System.Collections.IEnumerator .   : "     ?"   , , , ,     . 
      
     NET Framework 2.0 ( . : ,  )   ,    ,   .   ,      ,   Action, Converter<TInput,TOutput>   Predicate,    .   ,   .    ,        .  ,    List.ForEach(Action).   , ForEach ,           Foreach? 
       : 
     long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }     
      C#   IL     ,    : 
     long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; } 
      ,  C #       : IEnumerator .MoveNext ()  IEnumerator .Current.   List.Enumerator (  IEnumerator)     IL   callvirt,        . 
      ,   : 
     long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; }    ,    : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }     
     
      ,  List.ForEach      ,  Action<>  ,   .    callvirt IL ,    ,   callvirt. ,  ,  List.ForEach     . 
       ,     ,        List     : 
     for (int i = 0; i < List.Count; i++)     
     for (int i = 0; i < NUM_ITEMS; i++) 
     foreach (int i in List) 
     List.ForEach(delegate(int i) { result += i; }); 
     
     ,      : 
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       . ,   ,  List.ForEach  ,   !    ,  (  ) Foreach    ,   . ,    ,   ,  List.ForEach    . 
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     ,       Dell Inspiron 9400  Core Duo T2400  2   .        ,      : ForEachTest.zip (3,82 ). 
            ,    ,      .    5  ,   10000000  50000000  . 
     
       : 
     画像 
     
       : 
     画像 
     
      :      ForEach     List,       .  Array.ForEach         ( )      ,    foreach.   ,     ,  IEnumerator  foreach-  .  ,     IL,      .  ,  foreach  ,     ,     Array.ForEach       . 
     
      : 
     ..     Unity3D   C#,            .     using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } } 
     
      ,        ,   ,       1000  .       1000 ,    .          ,    ,    . 
         : 
     画像 
      ,           .   ForEach    .
    System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

    NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
    :
    long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
    C# IL , :
    long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
    , C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
    , :
    long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

    , List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
    , , List :
    for (int i = 0; i < List.Count; i++)
    for (int i = 0; i < NUM_ITEMS; i++)
    foreach (int i in List)
    List.ForEach(delegate(int i) { result += i; });

    , :
    画像
    . , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
    , , " ":
    画像
    , , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

    , Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
    , , . 5 , 10000000 50000000 .

    :
    画像

    :
    画像

    : ForEach List, . Array.ForEach     ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

    :
    .. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

    , , , 1000 . 1000 , . , , .
    :
    画像
    , . ForEach .
    System.Collections.Generic.IEnumerator System.Collections.IEnumerator . : " ?" , , , , .

    NET Framework 2.0 ( . : , ) , , . , , Action, Converter<TInput,TOutput> Predicate, . , . , . , List.ForEach(Action). , ForEach , Foreach?
    :
    long Sum(List<int> intList) { long result = 0; foreach (int i in intList) result += i; return result; }
    C# IL , :
    long Sum(List<int> intList) { long result = 0; List<T>.Enumerator enumerator = intList.GetEnumerator(); try { while (enumerator.MoveNext()) { int i = enumerator.Current; result += i; } } finally { enumerator.Dispose(); } return result; }
    , C # : IEnumerator .MoveNext () IEnumerator .Current. List.Enumerator ( IEnumerator) IL callvirt, .
    , :
    long Sum(List<int> intList) { long result = 0; intList.ForEach(delegate(int i) { result += i; }); result result; } , : long Sum(List<int> intList) { long result = 0; intList.ForEach(i => result += i); return result; }

    , List.ForEach , Action<> , . callvirt IL , , callvirt. , , List.ForEach .
    , , List :
    for (int i = 0; i < List.Count; i++)
    for (int i = 0; i < NUM_ITEMS; i++)
    foreach (int i in List)
    List.ForEach(delegate(int i) { result += i; });

    , :
    画像
    . , , List.ForEach , ! , ( ) Foreach , . , , , List.ForEach .
    , , " ":
    画像
    , , , , 50% . ForEach- 20%. List.ForEach , , - Foreach- . List.ForEach , Foreach.

    , Dell Inspiron 9400 Core Duo T2400 2 . , : ForEachTest.zip (3,82 ).
    , , . 5 , 10000000 50000000 .

    :
    画像

    :
    画像

    : ForEach List, . Array.ForEach     ( ) , foreach. , , IEnumerator foreach- . , IL, . , foreach , , Array.ForEach .

    :
    .. Unity3D C#, . using UnityEngine; using System.Collections; using System.Collections.Generic; public class testspeed : MonoBehaviour { public enum LoopType {none, for_loop, for_loop_no_count, foreach_loop, ListintForEach} public LoopType type; public int Count=2; public int iterationCount=1000; private List<int> lint = new List<int>(); private int[] alint; private long result; void Start () { for (int i = 0 ; i<Count; i++) {int r=UnityEngine.Random.Range(0,1000); lint.Add(r);} } void Update () { for (int j =0; j<iterationCount;j++) { result=0; switch (type) { case LoopType.for_loop: for (int i = 0; i < lint.Count; i++) {result += lint[i];} break; case LoopType.for_loop_no_count: for (int i = 0; i < Count; i++){result += lint[i];} break; case LoopType.foreach_loop: foreach (int i in lint) {result += i;} break; case LoopType.ListintForEach: lint.ForEach(i => result += i); break; } } } }

    , , , 1000 . 1000 , . , , .
    :
    画像
    , . ForEach .


Source: https://habr.com/ru/post/J210616/

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