cropper .net后台截图

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public void ProcessRequest(HttpContext context)    {        context.Response.ContentType = "text/plain";        var files = context.Request.Files[0];        int x = (int)Convert.ToDouble(context.Request["name"].Split(',')[0].Split(':')[1]);        int y = (int)Convert.ToDouble(context.Request["name"].Split(',')[1].Split(':')[1]);        int w = (int)Convert.ToDouble(context.Request["name"].Split(',')[2].Split(':')[1]);        int h = (int)Convert.ToDouble(context.Request["name"].Split(',')[3].Split(':')[1]);        Stream sm = files.InputStream;        byte[] bt = new byte[sm.Length];        sm.Read(bt, 0, files.ContentLength);        System.Drawing.Image bm = System.Drawing.Image.FromStream(CropImageFile(bt, x, y, w, h), true);        bm.Save(context.Request.PhysicalApplicationPath + "upload\\" + files.FileName);        bm.Dispose();                context.Response.Write("Hello World");    }    //裁剪    protected MemoryStream CropImageFile(byte[] imageFile, int targetX, int targetY, int targetW, int targetH)    {        MemoryStream imgMemoryStream = new MemoryStream();        System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(new MemoryStream(imageFile));        Bitmap bmPhoto = new Bitmap(targetW, targetH, System.Drawing.Imaging.PixelFormat.Format24bppRgb);        bmPhoto.SetResolution(72, 72);        Graphics grPhoto = Graphics.FromImage(bmPhoto);        grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;        grPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;        grPhoto.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;        try        {            grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);            bmPhoto.Save(imgMemoryStream, System.Drawing.Imaging.ImageFormat.Png);        }        catch (Exception e)        {            throw e;        }        finally        {            imgPhoto.Dispose();            bmPhoto.Dispose();            grPhoto.Dispose();        }        return imgMemoryStream;    }
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