WPF把Canvas另存为

由于wpf的UI使用xaml来表达的，所以我们们可利用这个优点，把WPF中的xaml元素另存为各样的文件，在很多时候我们都不须要这样的操作。把xaml保存为图片、字符串、XPS等等。这里我写了一些方法，以供大家参考.

注意：以下保存操作前，一定要确保参数中的canvas有高和宽。

1.把canvas保存为文本文件

1:  using System.Windows.Markup;

2:  using System.IO;

1:  public void Export(Uri path, Canvas surface)

2:  {

3:      if (path == null) return;

4:      if (surface == null) return;

5:  

6:      string xaml = XamlWriter.Save(surface);

7:      File.WriteAllText(path.LocalPath, xaml);

8:  }

2.把canvas保存为xps文件,xps命名空间在ReachFramework.dll中

1:  using System.IO.Packaging;

2:  using System.Windows.Xps;

3:  using System.Windows.Xps.Packaging;

4:  using System.IO;

 1:  public void Export(Uri path, Canvas surface)

 2:  {

 3:      if (path == null) return;

 4:  

 5:      Transform transform = surface.LayoutTransform;

 6:      surface.LayoutTransform = null;

 7:  

 8:      Size size = new Size(surface.Width, surface.Height);

 9:      surface.Measure(size);

10:      surface.Arrange(new Rect(size));

11:  

12:      Package package = Package.Open(path.LocalPath, FileMode.Create);

13:      XpsDocument doc = new XpsDocument(package);

14:      XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);

15:      writer.Write(surface);

16:      doc.Close();

17:      package.Close();

18:  

19:      surface.LayoutTransform = transform;

20:  }

3.把canvas保存为图片

 1:  public void ExportToPng(Uri path, Canvas surface)

 2:  {

 3:      if (path == null) return;

 4:  

 5:      Transform transform = surface.LayoutTransform;

 6:      surface.LayoutTransform = null;

 7:  

 8:      Size size = new Size(surface.Width, surface.Height);

 9:      surface.Measure(size);

10:      surface.Arrange(new Rect(size));

11:  

12:      RenderTargetBitmap renderBitmap =

13:        new RenderTargetBitmap(

14:          (int)size.Width,

15:          (int)size.Height,

16:          96d,

17:          96d,

18:          PixelFormats.Pbgra32);

19:      renderBitmap.Render(surface);

20:  

21:      using (FileStream outStream = new FileStream(path.LocalPath, FileMode.Create))

22:      {

23:          PngBitmapEncoder encoder = new PngBitmapEncoder();

24:          encoder.Frames.Add(BitmapFrame.Create(renderBitmap));

25:          encoder.Save(outStream);

26:      }

27:      surface.LayoutTransform = transform;

28:  }

结束语：

这几种都是WPF for win中使用的，希望能对你有所帮助。