WPF Image 控件 Source 绑定 ImageSource

不用通过 string 路径的方式，而用绑定 ImageSource 的方式。

XAML:

<Window.DataContext>
    <local:MainVM/>
</Window.DataContext>

<Grid>
    <Border BorderThickness="1" BorderBrush="Red">
        <Image Source="{Binding MyImage}" />
    </Border>
</Grid>

ViewModel：

internal static class ImageConvert
{
    [System.Runtime.InteropServices.DllImport("gdi32.dll")]
    public static extern bool DeleteObject(IntPtr hObject);

    public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)
    {
        IntPtr hBitmap = bitmap.GetHbitmap();

        ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
            hBitmap,
            IntPtr.Zero,
            Int32Rect.Empty,
            BitmapSizeOptions.FromEmptyOptions());

        // 释放内存
        if (!DeleteObject(hBitmap))
        {
            throw new System.ComponentModel.Win32Exception();
        }

        return wpfBitmap;
    }
}

public class MainVM : ViewModelBase
{
    private ImageSource _myImage;
    public ImageSource MyImage
    {
        get
        {
            if (_myImage == null)
            {
                Bitmap bitmap = new Bitmap("0.jpg");
                try
                {
                    _myImage = ImageConvert.ChangeBitmapToImageSource(bitmap);
                }
                catch(Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

            // GC.Collect();
            return _myImage;
        }
        set
        {
            _myImage = value;
            RaisePropertyChanged(nameof(MyImage));
        }
    }
}

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