WP7：如何存储PNG图片至图片库

Question

private void button1_Click(object sender, RoutedEventArgs e)
        {
            string tempJPEG = "WhiteParis.png";
            var store = IsolatedStorageFile.GetUserStoreForApplication();
            if (store.FileExists(tempJPEG))
            {
                store.DeleteFile(tempJPEG);
            }

            IsolatedStorageFileStream fileStream = store.CreateFile(tempJPEG);
            StreamResourceInfo sri = null;
            Uri uri = new Uri("Images/WhiteParis.png", UriKind.Relative);
            sri = Application.GetResourceStream(uri);

            BitmapImage bitmap = new BitmapImage();
            bitmap.SetSource(sri.Stream);
            WriteableBitmap wbmp = new WriteableBitmap(bitmap);

            Extensions.SaveJpeg(wbmp, fileStream, wbmp.PixelWidth, wbmp.PixelHeight, 0, 85);
            fileStream .Close ();


            fileStream = store.OpenFile(tempJPEG, FileMode.Open, FileAccess.Read);

            MediaLibrary mediaLibrary = new MediaLibrary();
            Picture pic = mediaLibrary.SavePicture("WhiteParis.png", fileStream);
            fileStream.Close();
        } 

我现在只会存取JPG格式，现在需要向媒体库里保存一张PNG格式的图片，请问怎么修改啊？

Answer 1

不行啊..我要写一个试衣间的应用，很多图片必须是背景透明吧.. 所以必须要PNG。。

Answer 2

http://forums.create.msdn.com/forums/t/90802.aspx

WP7上没法存储png图片，你可以先将png图片转换成 jpg 后使用你的老方法存储

Answer 3

额……有链接吗？我刚接触这个不久..请问怎么找呢？

Answer 4

msdn上有说