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public static class ToBitmapTool    {        /// 
        /// 截图转换成bitmap        /// 
        ///         /// 默认控件宽度        /// 默认控件高度        /// 默认0        /// 默认0        /// 
           public static Bitmap ToBitmap(this FrameworkElement element, int width = 0, int height = 0, int x = 0, int y = 0)        {            if (width == 0) width = (int)element.ActualWidth;            if (height == 0) height = (int)element.ActualHeight;            var rtb = new RenderTargetBitmap(width, height, x, y, System.Windows.Media.PixelFormats.Default);            rtb.Render(element);            var bit = BitmapSourceToBitmap(rtb);            //测试代码            DirectoryInfo d = new DirectoryInfo(System.IO.Path.Combine(Directory.GetCurrentDirectory(), "Cache"));            if (!d.Exists) d.Create();            bit.Save(System.IO.Path.Combine(d.FullName, "控件截图.png"));            return bit;        }        /// 
        /// BitmapSource转Bitmap        /// 
        ///         /// 
           public static Bitmap BitmapSourceToBitmap(this BitmapSource source)        {            return BitmapSourceToBitmap(source, source.PixelWidth, source.PixelHeight);        }        /// 
        /// Convert BitmapSource to Bitmap        /// 
        ///         /// 
           public static Bitmap BitmapSourceToBitmap(this BitmapSource source, int width, int height)        {            Bitmap bmp = null;            try            {                PixelFormat format = PixelFormat.Format24bppRgb;                /*set the translate type according to the in param(source)*/                switch (source.Format.ToString())                {                    case "Rgb24":                    case "Bgr24": format = PixelFormat.Format24bppRgb; break;                    case "Bgra32": format = PixelFormat.Format32bppPArgb; break;                    case "Bgr32": format = PixelFormat.Format32bppRgb; break;                    case "Pbgra32": format = PixelFormat.Format32bppArgb; break;                }                bmp = new Bitmap(width, height, format);                BitmapData data = bmp.LockBits(new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size),                    ImageLockMode.WriteOnly,                    format);                source.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);                bmp.UnlockBits(data);            }            catch            {                if (bmp != null)                {                    bmp.Dispose();                    bmp = null;                }            }            return bmp;        }    }

System.Windows.Forms.FolderBrowserDialog folderBrowserDialog = new System.Windows.Forms.FolderBrowserDialog();            if (folderBrowserDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)            {                string outDir = folderBrowserDialog.SelectedPath;                //CutScreen名称                System.Drawing.Bitmap bitmap= ToBitmapTool.ToBitmap(CutScreen);                bitmap.Save(System.IO.Path.Combine(outDir, Guid.NewGuid().ToString() + ".png"));                AutoCloseFrom ac = new AutoCloseFrom();                ac.Show();            }