Question

创建一个WritableBitmap并保存它只是一个问题，因为WritableBitmap似乎只支持JPEG。显然，这是一个非常不方便，我真的不知道该怎么办。如何将我的WritableBitmap保存为支持Windows Phone 8.1透明磁贴w /背景的

请注意，我的定位是8.0。

我的代码：

private static void CreateBitmap(int width, int height) { WriteableBitmap b = new WriteableBitmap(width, height); var canvas = new Grid(); canvas.Width = b.PixelWidth; canvas.Height = b.PixelHeight; var background = new Canvas(); background.Height = b.PixelHeight; background.Width = b.PixelWidth; // Removed this area of code which contains the design for my live tile. b.Render(background, null); b.Render(canvas, null); b.Invalidate(); //Draw bitmap using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication()) { using (IsolatedStorageFileStream imageStream = new IsolatedStorageFileStream("/Shared/ShellContent/" + imagename + ".jpeg", System.IO.FileMode.Create, isf)) { b.SaveJpeg(imageStream, b.PixelWidth, b.PixelHeight, 0, 100); } } }

Answer 1

有一个名为Cimbalino WP的工具包，它有一个使用WriteableBitmap保存PNG的扩展方法。 Cimbalino可以在NuGet上获得，用于获取背景组件所需的SavePng扩展方法。

以下是有关如何使用它的代码示例：

 using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
    {
        using (IsolatedStorageFileStream imageStream = new IsolatedStorageFileStream("/Shared/ShellContent/" + imagename + ".png", System.IO.FileMode.Create, isf))
        {
              Cimbalino.Phone.Toolkit.Extensions.WriteableBitmapExtensions.SavePng(b, imageStream);

        }
    }

Answer 2

只需尝试使用此代码段即可。您似乎可以在ToImage上调用WriteableBitmap扩展方法，该方法是ImageTools的一部分。

var img = bitmap.ToImage();
var encoder = new PngEncoder();
using (var stream = new IsolatedStorageFileStream(fileName, FileMode.Create, store))
{
encoder.Encode(img, stream);
stream.Close();
}

详细了解这些主题。 Save WriteableBitmap to file using WPF http://www.codeproject.com/Questions/272722/Converting-WriteableBitmap-to-a-Bitmap-for-saving

希望它有所帮助！

WriteableBitmap - 将自定义动态磁贴另存为透明PNG

2 个答案: