save image into isolated storage [duplicate]

问题:

Possible Duplicate:
store image into isolated storage in windows phone 7

I am using Visual Studio/Expression Blend to create my app for windows phone 7. The user should be able to select a picture that he/she wants to edit and after editing, the user can click a "save" button and the specific edited image will be saved in isolated storage. But I'm having trouble saving the image to Isolated Storage from the button click event.

Does anyone have a code example of how this can be achieved? Thanks!

My codes for the button :

using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication()) 

{ 

var bi = new BitmapImage(); bi.SetSource(pic); 

var wb = new WriteableBitmap(lion.jpg,lion.jpg.RenderTransform); 

using (var isoFileStream = isoStore.CreateFile("somepic.jpg")) 

{ 

var width = wb.PixelWidth; 

var height = wb.PixelHeight;

Extensions.SaveJpeg(wb, isoFileStream, width, height, 0, 100); 

 } 
}

回答1:

To save an image to IsolatedStorage from a PhotoChooserTask, use this (the e object in the task callback holds the stream):

public static void SaveImage(Stream imageStream, string fileName, int orientation, int quality)
{
    using (var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
    {
        if (isolatedStorage.FileExists(fileName))
            isolatedStorage.DeleteFile(fileName);

        IsolatedStorageFileStream fileStream = isolatedStorage.CreateFile(fileName);
        BitmapImage bitmap = new BitmapImage();
        bitmap.SetSource(imageStream);

        WriteableBitmap wb = new WriteableBitmap(bitmap);
        wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, orientation, quality);
        fileStream.Close();
    }
}