获取绑定属性类中的其他属性

发布于 2024-12-07 03:34:14 字数 648 浏览 0 评论 0原文

如果我有一个要绑定的嵌套类，我如何检索该父类。例如，我已绑定到 SecondClass.ImageSource。我现在想在点击图像时获取SecondClass的信息，我该如何实现呢？

我想更改 SecondClass 属性，但问题是我有一个包含相同图像项目的网格。

图像的绑定已经起作用。

XAML：

<Image Source="{Binding Path=SecondClass.ImageSource}" Width="48" Height="48" MouseUp="Image_MouseUp_1" />

代码：

public class FirstClass {
    public int number { get; set; }
    public SecondClass SecondClass

}

public class SecondClass {
    public ImageSource ImageSource { get; set; }
}


private void Image_MouseUp_1(object sender, MouseButtonEventArgs e) {
     FirstClass item = ????        
}

原文

If I got a nested class that I am binding to, how could I retrieve that parent class. For example, I have bound to SecondClass.ImageSource. I now want to get the information of the SecondClass when I click on the Image, how can I achieve this?

I would like to change the SecondClass property, but the problem is that I have a grid of the same image items.

The binding of the image works already.

Xaml:

<Image Source="{Binding Path=SecondClass.ImageSource}" Width="48" Height="48" MouseUp="Image_MouseUp_1" />

Code:

public class FirstClass {
    public int number { get; set; }
    public SecondClass SecondClass

}

public class SecondClass {
    public ImageSource ImageSource { get; set; }
}


private void Image_MouseUp_1(object sender, MouseButtonEventArgs e) {
     FirstClass item = ????        
}

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那片花海 2024-12-14 03:34:14

您只能绑定到 SecondClass.ImageSource，因为 Image 的 DataContext 是 FirstClass 的实例。所以在处理程序中你只需要强制转换它：

private void Image_MouseUp_1(object sender, MouseButtonEventArgs e) {
     FirstClass item = (sender as Image).DataContext as FirstClass;
     //<Change item.SecondClass or do whatever you want>
}

You can only bind to SecondClass.ImageSource because the DataContext of the Image is an instance of FirstClass. So in the handler you only need to cast it:

private void Image_MouseUp_1(object sender, MouseButtonEventArgs e) {
     FirstClass item = (sender as Image).DataContext as FirstClass;
     //<Change item.SecondClass or do whatever you want>
}

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花伊自在美 2024-12-14 03:34:14

您的数据对象需要知道它的父对象，或者您可以使用 RelativeSource 或 ElementName 绑定来引用父对象。例如

<Window x:Name="RootWindow" DataContext="{Binding FirstClass}">
    <Grid DataContext="{Binding SecondClass.SomeProperty}">

        <!-- Binding using ElementName -->
        <Button Context="{Binding ElementName=RootWindow, 
                Path=DataContext.SecondClass}" />

        <!-- Binding using RelativeSource -->
        <Button Context="{Binding RelativeSource=
                {RelativeSource AncestorType={x:Type Window}}, 
                Path=DataContext.SecondClass}" />
    </Grid>
</Window>

Your Data Object either needs to know it's parent object, or you can use a RelativeSource or ElementName binding to reference a parent object. For example

<Window x:Name="RootWindow" DataContext="{Binding FirstClass}">
    <Grid DataContext="{Binding SecondClass.SomeProperty}">

        <!-- Binding using ElementName -->
        <Button Context="{Binding ElementName=RootWindow, 
                Path=DataContext.SecondClass}" />

        <!-- Binding using RelativeSource -->
        <Button Context="{Binding RelativeSource=
                {RelativeSource AncestorType={x:Type Window}}, 
                Path=DataContext.SecondClass}" />
    </Grid>
</Window>

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