Save+as+Image+using+DrawingImage()+in+WPF

using System.Windows;

using System.Windows.Controls;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using Amwell.Gps.MapControl.Interface;

using Amwell.Gps.MapControl.General;

using System.Security.Permissions;

using System.IO;

// Creates thumbnail image form the webbrowser control in wpf

// Or Thumbnail of web pages image created can be easily loaded in any

// image control..

public string GetThumbnailImage(WebBrowser CurrentBrowser,string filepath)

{

Guid guid = Guid.NewGuid();

//string ThumbnailPath = @"E:\" + guid.ToString() + ".png";

string ThumbnailPath = filepath + ".png";

Image imgScreen = new Image();

imgScreen.Width = CurrentBrowser.ActualWidth;

imgScreen.Height = CurrentBrowser.ActualHeight;

imgScreen.Source = new DrawingImage(VisualTreeHelper.GetDrawing(CurrentBrowser));

FileStream stream = new FileStream(ThumbnailPath, FileMode.Create);

DrawingVisual vis = new DrawingVisual();

DrawingContext cont = vis.RenderOpen();

cont.DrawImage(imgScreen.Source, new Rect(new Size(CurrentBrowser.ActualWidth, CurrentBrowser.ActualHeight)));

cont.Close();

RenderTargetBitmap rtb = new RenderTargetBitmap((int)imgScreen.Width,

(int)imgScreen.Height, 96d, 96d, PixelFormats.Default);

rtb.Render(vis);

PngBitmapEncoder encoder = new PngBitmapEncoder();

encoder.Frames.Add(BitmapFrame.Create(rtb));

encoder.Save(stream);

stream.Close();

return ThumbnailPath;

}

public void SaveCurrentMapToPicture()

{

Microsoft.Win32.SaveFileDialog dialogOpenFile = new Microsoft.Win32.SaveFileDialog();

dialogOpenFile.DefaultExt = "png";//默认扩展名

dialogOpenFile.AddExtension = true;//是否自动添加扩展名

dialogOpenFile.Filter = "*.png|.png";

dialogOpenFile.OverwritePrompt = true;//文件已存在是否提示覆盖

dialogOpenFile.FileName = "文件名";//默认文件名

dialogOpenFile.CheckPathExists = true;//提示输入的文件名无效

dialogOpenFile.Title = "保存当前地图";

//显示对话框

bool? b = dialogOpenFile.ShowDialog();

if (b == true)//点击保存

{

GetThumbnailImage(map, dialogOpenFile.FileName);

}

}

copy from http://nethelp.wikidot.com/save-as-image-using-drawingimage-in-wpf
thanks