このシナリオを説明する優れた MSDN の記事があります。
方法: Windows Phone 用に JPEG をエンコードし、ピクチャ ライブラリに保存する
ちなみに、これはGoogleとBingwindows phone save image to media library
の両方で検索した場合の最初の検索結果リンクでもあります。
このガイドに従ってみましたか?もしそうなら、何に問題がありますか?
それを保存するための重要なコード:
private void btnSave_Click(object sender, RoutedEventArgs e)
{
// Create a file name for the JPEG file in isolated storage.
String tempJPEG = "TempJPEG";
// Create a virtual store and file stream. Check for duplicate tempJPEG files.
var myStore = IsolatedStorageFile.GetUserStoreForApplication();
if (myStore.FileExists(tempJPEG))
{
myStore.DeleteFile(tempJPEG);
}
IsolatedStorageFileStream myFileStream = myStore.CreateFile(tempJPEG);
// Create a stream out of the sample JPEG file.
// For [Application Name] in the URI, use the project name that you entered
// in the previous steps. Also, TestImage.jpg is an example;
// you must enter your JPEG file name if it is different.
StreamResourceInfo sri = null;
Uri uri = new Uri("[Application Name];component/TestImage.jpg", UriKind.Relative);
sri = Application.GetResourceStream(uri);
// Create a new WriteableBitmap object and set it to the JPEG stream.
BitmapImage bitmap = new BitmapImage();
bitmap.CreateOptions = BitmapCreateOptions.None;
bitmap.SetSource(sri.Stream);
WriteableBitmap wb = new WriteableBitmap(bitmap);
// Encode the WriteableBitmap object to a JPEG stream.
wb.SaveJpeg(myFileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
myFileStream.Close();
// Create a new stream from isolated storage, and save the JPEG file to the media library on Windows Phone.
myFileStream = myStore.OpenFile(tempJPEG, FileMode.Open, FileAccess.Read);
// Save the image to the camera roll or saved pictures album.
MediaLibrary library = new MediaLibrary();
if (radioButtonCameraRoll.IsChecked == true)
{
// Save the image to the camera roll album.
Picture pic = library.SavePictureToCameraRoll("SavedPicture.jpg", myFileStream);
MessageBox.Show("Image saved to camera roll album");
}
else
{
// Save the image to the saved pictures album.
Picture pic = library.SavePicture("SavedPicture.jpg", myFileStream);
MessageBox.Show("Image saved to saved pictures album");
}
myFileStream.Close();
}