c# - 图像拖放(WPF 窗口)

Question

我需要从Image img2拖放到Image img1。这意味着当我将 img2 拖动到 img1 上时，我想复制它。程序正在启动，但在将 Image img2 拖到目标 Image img1 上后，目标 Image img1 没有改变。

How to solve this problem to make it work ?

我的代码如下:

XAML:

<Canvas Name="va">
        <Image Name="img1" Height="100" Width="100" AllowDrop="True" Drop="img1_Drop" />
        <Image Name="img2" Height="100" Width="100" Source="Resources/eye.bmp" 
               MouseLeftButtonDown="img2_MouseLeftButtonDown" AllowDrop="True" />
</Canvas>

C# 代码:

private void img2_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    Image image = e.Source as Image;
    DataObject data = new DataObject(typeof(ImageSource), image.Source);
    DragDrop.DoDragDrop(image, data, DragDropEffects.All);
}

private void img1_Drop(object sender, DragEventArgs e)
{
    Image imageControl = (Image)sender;
    if ((e.Data.GetData(typeof(ImageSource)) != null))
    {
        ImageSource image = e.Data.GetData(typeof(ImageSource)) as ImageSource;
        imageControl = new Image() { Width = 100, Height = 100, Source = image };
        img1 = imageControl;
    }
}

Answer 1

分配img1 = imageControl;不会向 Canvas 添加新的图像控件。

您应该简单地分配 img1 的 Source 属性:

img1.Source = (ImageSource)e.Data.GetData(typeof(ImageSource));