保存控件为PNG图片

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private void SaveToImage(FrameworkElement surface, string fileName)        {            var transform = surface.LayoutTransform;            surface.LayoutTransform = null;            var size = new Size(surface.Width, surface.Height);            surface.Measure(size);            surface.Arrange(new Rect(size));            var renderBitmap =             new RenderTargetBitmap(               (int)size.Width,               (int)size.Height,                96d,               96d,                PixelFormats.Pbgra32);            renderBitmap.Render(surface);            using (var outStream = new FileStream(fileName, FileMode.Create))            {                var encoder = new PngBitmapEncoder();                encoder.Frames.Add(BitmapFrame.Create(renderBitmap));                encoder.Save(outStream);            }            surface.LayoutTransform = transform;        }

surface为控件实例，fileName为保存的PNG图片的全路径名称。

下面的是另一段关于保存PNG的代码，但是和上面的没有什么直接的关系,只是为了自己记忆方便，所以这里放在一起。

private static void temp()    {      //428,243      var font10 = new Font("宋体", 10);      var font16b = new Font("宋体", 16, FontStyle.Bold);      Brush brush_b = new SolidBrush(Color.Black);      var img = new Bitmap(1501, 1001);      var g = Graphics.FromImage(img);      g.FillRectangle(new SolidBrush(Color.White), 0, 0, 1500, 1000);      const int gx0 = 428;      const int gy0 = 243;      var pen_b = new Pen(Color.Black);      for (var x = 0; x < 31; x++)      {        g.DrawLine(pen_b, x * 50, 0, x * 50, 1000);      }      for (var y = 0; y < 21; y++)      {        g.DrawLine(pen_b, 0, y * 50, 1500, y * 50);      }      for (var x = 0; x < 31; x++)      {        for (var y = 0; y < 21; y++)        {          g.DrawString((gx0 + x).ToString(CultureInfo.InvariantCulture), font10, brush_b, x * 50 + 1, y * 50 + 1);          g.DrawString((gy0 + y).ToString(CultureInfo.InvariantCulture), font10, brush_b, x * 50 + 1, y * 50 + 13);        }      }      DataTable dt = conn.GetDataTable(" select gx,gy,count(*) as c from (select gx,gy,ci from ModelMR where gx>=428 and gx<=457 and gy>=243 and gy<=263 group by gx,gy,ci) a group by gx,gy order by c,gx,gy");      foreach (DataRow row in dt.Rows)      {        var c = int.Parse(row["c"].ToString());        if (c > 2) continue;        var gx = int.Parse(row["gx"].ToString()) - gx0;        var gy = int.Parse(row["gy"].ToString()) - gy0;        g.DrawString(c.ToString(CultureInfo.InvariantCulture), font16b, brush_b, gx * 50 + 33, gy * 50 + 30);      }      img.Save(@"D:\1111.png", ImageFormat.Png);      img.Dispose();    }

上面是WPF保存控件为图片的例子，下面是转载Silverlight把控件转为PNG图片的文章：

第一篇文字地址：http://dingtao-wgs.blog.163.com/blog/static/502607142010815105212137/

第二篇文字地址：http://www.cnblogs.com/ampedZ/archive/2012/12/29/GetBMP24Stream.html