将 System.Drawing.Icon 转换为 Microsoft.UI.Xaml.ImageSource

Question

存在将

System.Drawing.Icon

转换为

System.Media.ImageSource

的解决方案（请参阅将 System.Drawing.Icon 转换为 System.Media.ImageSource）。但是当我使用WinUI而不是WPF时，这个分辨率似乎不可用。我需要将

System.Drawing.Icon

转换为

Microsoft.UI.Xaml.ImageSource

以在

Image

控件中显示应用程序的图标。

我尝试过使用

Microsoft.UI.Xaml.Media.Imaging.BitmapSource.FromAbi(System.Drawing.Icon.Icon.Handle)

，但它抛出了

System.AccessViolationException

。

那么，我怎样才能获得

Microsoft.UI.Xaml.ImageSource

版本的图标？

Answer 1

这是一段从 GDI+ Icon 转换为 WinUI3 BitmapSource 的 C# 代码，使用图标的像素从一个复制到另一个。

public static async Task<Microsoft.UI.Xaml.Media.Imaging.SoftwareBitmapSource> GetWinUI3BitmapSourceFromIcon(System.Drawing.Icon icon)
{
    if (icon == null)
        return null;

    // convert to bitmap
    using var bmp = icon.ToBitmap();
    return await GetWinUI3BitmapSourceFromGdiBitmap(bmp);
}

public static async Task<Microsoft.UI.Xaml.Media.Imaging.SoftwareBitmapSource> GetWinUI3BitmapSourceFromGdiBitmap(System.Drawing.Bitmap bmp)
{
    if (bmp == null)
        return null;

    // get pixels as an array of bytes
    var data = bmp.LockBits(new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, bmp.PixelFormat);
    var bytes = new byte[data.Stride * data.Height];
    Marshal.Copy(data.Scan0, bytes, 0, bytes.Length);
    bmp.UnlockBits(data);

    // get WinRT SoftwareBitmap
    var softwareBitmap = new Windows.Graphics.Imaging.SoftwareBitmap(
        Windows.Graphics.Imaging.BitmapPixelFormat.Bgra8,
        bmp.Width,
        bmp.Height,
        Windows.Graphics.Imaging.BitmapAlphaMode.Premultiplied);
    softwareBitmap.CopyFromBuffer(bytes.AsBuffer());

    // build WinUI3 SoftwareBitmapSource
    var source = new Microsoft.UI.Xaml.Media.Imaging.SoftwareBitmapSource();
    await source.SetBitmapAsync(softwareBitmap);
    return source;
}