विंडोज फोन 7 के लिए शुरू से आखिर तक एक एप्लिकेशन बनाएं। भाग 15. विंडोज फोन पर तस्वीरों तक पहुंच

पिछला हिस्सा

आप उपयोगकर्ता इंटरफ़ेस में उन्हें प्रदर्शित करने के लिए एप्लिकेशन संसाधनों के रूप में फ़ोटो और अन्य छवियों का उपयोग कर सकते हैं। आपका एप्लिकेशन फ़ोन के मीडिया लाइब्रेरी में फ़ोटो एक्सेस कर सकता है या उपयोगकर्ताओं को अंतर्निहित कैमरे के साथ तस्वीरें लेने की अनुमति दे सकता है।

इस भाग में आप सीखेंगे:

• विंडोज फोन पर फोटो कैसे एक्सेस करें।

विंडोज फोन पर एक्सेस फोटोज

मीडिया लाइब्रेरी और कैमरा छवियों से छवियों तक पहुंचने के लिए, PhotoChooserTask और CameraCaptureTask का उपयोग करें। इन वर्गों को चयनकर्ता (चयन) के रूप में जाना जाता है क्योंकि वे एक अलग विंडो खोलते हैं जिसमें उपयोगकर्ता एक विकल्प बनाता है, जिसे बाद में आपके आवेदन पर लौटा दिया जाता है। लॉन्चर (लॉन्च) भी हैं जो एक अलग विंडो खोलते हैं, लेकिन एप्लिकेशन को उपयोगकर्ता की पसंद वापस नहीं करते हैं।

PhotoChooserTask और CameraCaptureTask को समान कोड की आवश्यकता होती है, इसलिए हम केवल PhotoChooserTask का वर्णन करेंगे। इसके अलावा, यह वर्णन करेगा कि अलग-अलग भंडारण में चयनित फ़ोटो को कैसे बचाया जाए। आप XNA MediaLibrary क्लास के माध्यम से मीडिया लाइब्रेरी में चित्र प्राप्त और सहेज सकते हैं। हालांकि, इस वर्ग पर विचार नहीं किया जाएगा।

चयनकर्ता का उपयोग करने के लिए, आपको इसे तुरंत करने की आवश्यकता है। निम्न छवि PhotoChooserTask का एक उदाहरण दिखाती है।



उपयोगकर्ता द्वारा चयन किए जाने के बाद, आपको उचित कार्य करने के लिए पूर्ण की गई घटना को संभालना होगा। निम्न कोड स्निपेट (CarDetailsPage.xaml.cs से) दर्शाता है कि PhotoChooserTask कैसे बनाया जाए और इसकी पूर्ण घटना को कैसे हैंडल किया जाए। ध्यान दें कि PhotoChooserTask पृष्ठ के लिए एक वैश्विक चर होना चाहिए, और निर्माण में पूर्ण घटना को सक्षम किया जाना चाहिए।

private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .

1. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
3. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
4. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
5. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
6. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
8. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
9. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
11. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
12. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
13. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
14. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
16. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
17. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
18. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
19. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
20. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
21. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
22. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
23. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
24. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
25. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
26. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
27. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
28. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
29. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
30. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .
31. private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .

private readonly PhotoChooserTask photoTask = new PhotoChooserTask(); public CarDetailsPage() { InitializeComponent(); photoTask.Completed += PhotoTask_Completed; // ... other code ... } private void PhotoButton_Click( object sender, RoutedEventArgs e) { photoTask.Show(); } private void PhotoTask_Completed( object sender, PhotoResult e) { if (e.TaskResult == TaskResult.OK) { var image = new System.Windows.Media.Imaging.BitmapImage(); image.SetSource(e.ChosenPhoto); CarDataStore.SaveTempCarPhoto(image, delegate { MessageBox.Show( "There is not enough space on " + "your phone to save your selection. Free some " + "space and try again." , "Warning" , MessageBoxButton.OK); }); car.Picture = image; hasUnsavedChanges = true ; } } * This source code was highlighted with Source Code Highlighter .

उपयोगकर्ता "फोटो" बटन पर क्लिक करने के बाद, PhotoChooserTask प्रदर्शित होता है। इसके कारण एप्लिकेशन निष्क्रिय हो जाता है। उपयोगकर्ता द्वारा एक तस्वीर का चयन करने के बाद, आवेदन को फिर से सक्रिय किया जाता है, हालांकि इस मामले में, PhotoChooserTask.Completed घटना OnNavigatedTo विधि को पुन: सक्रिय करने के लिए कहा जाता है।

पूरा किया गया ईवेंट हैंडलर एक नया बिटमैपइमेज बनाता है और चयनित फ़ोटो को इसके स्रोत के रूप में सेट करता है। अगला, ईवेंट हैंडलर छवि को अलग-अलग भंडारण में रखता है। छवियां क्रमबद्ध नहीं हैं, इसलिए उन्हें मेमोरी में संग्रहीत राज्य शब्दकोशों में संग्रहीत नहीं किया जा सकता है, न ही पृथक भंडारण के राज्य शब्दकोशों में। इसलिए, यदि आप किसी छवि को सहेजना चाहते हैं, तो आपको अलग-अलग संग्रहण वर्चुअल फ़ाइल सिस्टम इंटरफ़ेस का उपयोग करके इसे सहेजना होगा। उपयोगकर्ता द्वारा सेव बटन पर क्लिक करने के बाद CarDataStore वर्ग को फोटो को एक अलग स्टोरेज में रखना होगा। इस प्रकार, SaveTempCarPhoto और GetTempCarPhoto एक अस्थायी फ़ोटो को संसाधित करने के तरीके बस SaveCarPhoto और GetCarPhoto विधियों को सहेजे गए फ़ोटो को संसाधित करने के लिए उपयोग करते हैं। SaveCarPhoto और GetCarPhoto विधियों को "पृथक भंडारण: बचत और लोडिंग डेटा" अनुभाग में वर्णित किया गया था।

अंत में, ईवेंट हैंडलर कार फ़ील्ड में संग्रहीत कार ऑब्जेक्ट की पिक्चर प्रॉपर्टी को छवि प्रदान करता है। उसके बाद, तस्वीर चित्र संपत्ति से जुड़े छवि नियंत्रण में दिखाई देगी।

नोट:
PhotoResult वर्ग पूरा होने वाले ईवेंट हैंडलर के लिए उत्तीर्ण होता है जिसमें OriginalFileName गुण होता है। यह संपत्ति XNA MediaLibrary से चयनित फोटो प्राप्त करने के लिए उपयोग करने के लिए सुविधाजनक होगी ताकि आपको इसे अलग-अलग भंडारण में अलग से सहेजना न पड़े। हालांकि, लेखन के समय, ओरिजिनलनेम का कार्यान्वयन अपेक्षित रूप से व्यवहार नहीं कर रहा है: यह एक अस्थायी फ़ाइल नाम लौटाता है, जो बाद में XNA MediaLibrary क्लास से फ़ोटो पुनर्प्राप्त करने के लिए उपयोगी नहीं है। हालाँकि, यदि आप इस तरह से मीडिया लाइब्रेरी का उपयोग कर सकते हैं, तब भी आप सबसे अधिक संभावना है कि उपयोगकर्ता द्वारा चुनी गई छवियों को अलग-अलग स्टोरेज में रखना पसंद करेंगे। इस स्थिति में, वे आपके एप्लिकेशन के लिए उपलब्ध रहेंगे, भले ही उपयोगकर्ता बाद में मीडिया लाइब्रेरी से छवियों को हटा दें या अन्य एप्लिकेशन का उपयोग करके अपनी सामग्री को बदल दें।