如何在方法中獲得“對象發送者”的孩子？

Question

我的應用程序中有一個帶有15個邊框的圖像，它在MouseUp上調用一個方法..所有圖像都有不同的名稱..因此為什么我希望它們都調用這個方法

<GroupBox Width="75" Height="75">
      <Border MouseLeftButtonUp="Image_MouseUp1" Background="Transparent">
           <Image x:Name="RedPick5_Image" Height="Auto" Width="Auto"/>
      </Border>
</GroupBox>

我希望他們所有人都能夠設置孩子的圖像源（如果我理解正確，圖像就是邊框的孩子..我怎么能這樣做？

        private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
        {
            //want to set any image that calls this
            //something like Sender.Child.Source = ...
        }

Answer 1

你需要施放發件人並檢查

    private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
    {
        var border = sender as Border; // Cast to Border
        if (border != null)            // Check if the cast was right
        {
            var img = border.Child as Image;  // Cast to Image
            if (img != null)                  // Check if the cast was right
            {
                // your code
            }
            // else your Child isn't an Image her you could hast it to an other type
        }
        // else your Sender isn't an Border
    }

你也可以這樣做

    private void Image_MouseUp1(object sender, MouseButtonEventArgs e)
    {
        var border = sender as Border;
        if (border == null) // if the cast to Border failed
            return;         

        var img = border.Child as Image;
        if (img == null) // if the cast to Image failed
            return;

        // your code
    }

Answer 2

如果圖像只是邊框的直接子節點，你可以這樣做：

Image image = (Image)((Border)sender).Child;
image.Source = // Set image source here.

Answer 3

或者，您可以使用FindName

(Image)(sender as Border).FindName("RedPick5_Image");

它將以遞歸方式搜索Border的子節點，以獲取名為“RedPick5_Image”的元素。 如果未找到具有指定名稱的元素，則此參數可能返回null。