在WPF中把Canvas儲存為圖片,文字檔案,xps檔案
阿新 • • 發佈:2019-02-19
由於wpf的UI使用xaml來表達的,所以我們們可利用這個優點,把WPF中的xaml元素另存為各樣的檔案,在很多時候我們都不須要這樣的操作。把xaml儲存為圖片、字串、XPS等等。這裡我寫了一些方法,以供大家參考.。
注意:以下儲存操作前,一定要確保引數中的canvas有高和寬。
1.把canvas儲存為文字檔案
using System.IO; public void Export(Uri path, Canvas surface) { if (path == null) return; if (surface == null) return; string xaml = XamlWriter.Save(surface); File.WriteAllText(path.LocalPath, xaml);
}
2.把canvas儲存為xps檔案,xps名稱空間在ReachFramework.dll中
using System.IO.Packaging;
using System.Windows.Xps;
using System.Windows.Xps.Packaging;
using System.IO;
public void Export(Uri path, Canvas surface)
{
if (path == null) return;
Transform transform = surface.LayoutTransform;
surface.LayoutTransform = null;
Size size = new Size(surface.Width, surface.Height);
surface.Measure(size);
surface.Arrange(new Rect(size));
Package package = Package.Open(path.LocalPath, FileMode.Create);
XpsDocument doc = new XpsDocument(package);
XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);
writer.Write(surface);
doc.Close();
package.Close();
surface.LayoutTransform = transform;
}
3.把canvas儲存為圖片
public void ExportToPng(Uri path, Canvas surface)
{
if (path == null) return;
Transform transform = surface.LayoutTransform;
surface.LayoutTransform = null;
Size size = new Size(surface.Width, surface.Height);
surface.Measure(size);
surface.Arrange(new Rect(size));
RenderTargetBitmap renderBitmap =
new RenderTargetBitmap(
(int)size.Width,
(int)size.Height,
96d,
96d,
PixelFormats.Pbgra32);
renderBitmap.Render(surface);
using (FileStream outStream = new FileStream(path.LocalPath, FileMode.Create))
{
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
encoder.Save(outStream);
}
surface.LayoutTransform = transform;
}
這幾種都是WPF for win中使用的,希望能對你有所幫助。