保存BitmapSource时出错

Question

I have a problem when I try to save a BitmapSource. I alsways get an error in GDI+ or that the file is in use by another proces.

The methode to save the bitmapimage

protected override void Save()
{
    Bitmap bitmap = Thumbnail.ToBitmap();

    if (Angle % 360 == 0)
        bitmap.RotateFlip(RotateFlipType.RotateNoneFlipNone);
    else if (Angle % 270 == 0)
        bitmap.RotateFlip(RotateFlipType.Rotate270FlipNone);
    else if (Angle % 180 == 0)
        bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);
    else if (Angle % 90 == 0)
        bitmap.RotateFlip(RotateFlipType.Rotate90FlipNone);

    bitmap.Save(Objects[0].FilePath);
    Objects[0].RaisePropertyChanged("Thumbnail");
}

BitmapSource to Bitmap conversion

public static Bitmap ToBitmap(this BitmapSource bitmapsource)
{
    using (MemoryStream stream = new MemoryStream())
    {
        BitmapEncoder enc = new BmpBitmapEncoder();
        enc.Frames.Add(BitmapFrame.Create(bitmapsource));
        enc.Save(stream);

        using (var tempBitmap = new Bitmap(stream))
        {
            return new Bitmap(tempBitmap);
        }
    }
}

The "Thumbnail" that is used to save comes from a get-property

public BitmapSource Image
{
    get { return new BitmapImage(new Uri(FilePath)); }
}

And the thumbnail of the file is also used in a view. I get it with the windows shell api.

public static BitmapSource GetThumbnail(this string This, BitmapSize size = BitmapSize.Large)
{
    if (ShellObject.IsPlatformSupported)
    {
        ShellObject shellitem = ShellObject.FromParsingName(This);

        try
        {
            if (size == BitmapSize.Small)
                return shellitem.Thumbnail.SmallBitmap.ToBitmapSource();
            else if (size == BitmapSize.Medium)
                return shellitem.Thumbnail.MediumBitmap.ToBitmapSource();
            else if (size == BitmapSize.Large)
                return shellitem.Thumbnail.LargeBitmap.ToBitmapSource();
            else
                return shellitem.Thumbnail.ExtraLargeBitmap.ToBitmapSource(); ;
        }
        catch (Exception)
        {
            return null;
        }
    }

        return null;
    }

Does anyon has a solution?

Thanks Wim

Answer 1

尝试使用Application.current.dispatcher

Application.current.dispatcher(()=>Save());