Wpf datatemplate不绑定属性值 [英] Wpf datatemplate does not binding property value

问题描述

我有一个带标题的组框应该在xaml中显示带按钮的文本。使用我的viewmodel中定义的IsbtnVisibility属性设置Header按钮的可见性。

I have one group box with header should display a text with button in xaml. setting visibility of Header button using IsbtnVisibility property defined in my viewmodel.

IsbtnVisibility 

是bool属性。如果它是假的，按钮应该是collpase但它没有按预期工作。有没有办法解决它。



我尝试过的事情：

is bool property. when it is false the button should collpase but it is not working as expected. Is there any way to solve it.

What I have tried:

<GroupBox Grid.Row="0" Padding="3,5,3,3">

                                              <GroupBox.HeaderTemplate>
                                                  <DataTemplate>
                                                      <StackPanel Orientation="Horizontal" >
                                                          <TextBlock Text="Sample Header " FontWeight="Bold"/>
                                                          <UserCntrl:RoundedButton x:Name="btnRoundedButton" Visibility="{Binding Path=IsbtnVisibility,Converter={StaticResource FalseToCollapsedConverter}}"/>
                                                      </StackPanel>
                                                  </DataTemplate>
                                              </GroupBox.HeaderTemplate>
                                              </GroupBox>

推荐答案

HeaderTemplate 有自己的 DataContext ，因此您无法直接绑定到父 DataContext 上的属性。如果检查输出窗口，您将看到错误，告诉您找不到该属性。



您需要使用 RelativeSource 绑定以访问父 DataContext ：

The HeaderTemplate has its own DataContext, so you can't bind directly to properties on the parent DataContext. If you examine the output window, you will see errors telling you that the property was not found.

You need to use a RelativeSource binding to access the parent DataContext:

<UserCntrl:RoundedButton x:Name="btnRoundedButton" 
    Visibility="{Binding Path=DataContext.IsbtnVisibility,
    RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type GroupBox}}, Converter={StaticResource FalseToCollapsedConverter}}"
/>

WPF GroupBox HeaderTemplate和DataBinding - 堆栈溢出 [ ^ ]

在Visual Studio中执行项目时，您是否在输出窗口中看到BindingExpression错误？



c＃ - WPF Error 40 BindingExpression路径错误：'object'上找不到属性 - Stack Overflow [ ^ ]



如果是，那可能是你的意思我想看看修复。



如果不是，你可以在你遇到问题的绑定中使用布尔到布尔转换器。只需在转换器中设置一个断点，即可查看在视图和数据源之间传递的实际值...



WPF教程|调试数据绑定问题 [ ^ ]

Do you see a BindingExpression error being displayed in the Output Window when you execute your project in Visual Studio?

c# - WPF Error 40 BindingExpression path error: property not found on 'object' - Stack Overflow[^]

If Yes, that is probably something you want to look into fixing.

If No, You can use a Boolean to Boolean converter in the binding that you are having trouble with. Just set a breakpoint in the converter to see the actual values being passed forth and back between view and data source...

WPF Tutorial | Debug DataBinding Issues[^]

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