Question

我正在使用MVVM，在我的ViewModel中，我有一些BitmapData集合。我希望它们通过数据绑定显示在我的视图中。

我该怎么做？

解决方案：

[ValueConversion(typeof(BitmapData), typeof(ImageSource))]
public class BitmapDataConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        BitmapData data = (BitmapData)value;
        WriteableBitmap bmp = new WriteableBitmap(
            data.Width, data.Height,
            96, 96,
            PixelFormats.Bgr24,
            null);
        int len = data.Height * data.Stride;
        bmp.WritePixels(new System.Windows.Int32Rect(0, 0, data.Width, data.Height), data.Scan0, len, data.Stride, 0, 0);
        return bmp;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

Answer 1

您可以从图像文件路径设置Image.Source这一事实可能会导致自动转换（由ImageSourceConverter提供）。

如果您想将Image.Source绑定到BitmapData类型的对象，则必须编写一个binding converter，如下所示。但是，您必须了解从BitmapData写入WritableBitmap的详细信息。

[ValueConversion(typeof(System.Drawing.Imaging.BitmapData), typeof(ImageSource))]
public class BitmapDataConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        System.Drawing.Imaging.BitmapData data = (System.Drawing.Imaging.BitmapData)value;
        WriteableBitmap bitmap = new WriteableBitmap(data.Width, data.Height, ...);
        bitmap.WritePixels(...);
        return bitmap;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

也许this question有助于实现转化。

Answer 2

解决方案，感谢Clemens。

[ValueConversion(typeof(BitmapData), typeof(ImageSource))]
public class BitmapDataConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        BitmapData data = (BitmapData)value;
        WriteableBitmap bmp = new WriteableBitmap(
            data.Width, data.Height,
            96, 96,
            PixelFormats.Bgr24,
            null);
        int len = data.Height * data.Stride;
        bmp.WritePixels(new System.Windows.Int32Rect(0, 0, data.Width, data.Height), data.Scan0, len, data.Stride, 0, 0);
        return bmp;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

如何将数据从BitmapData绑定到WPF图像控件？

2 个答案: