Question

Label.Binding外TextBox.Template确实可行，但当我想将ViewModel.Value绑定到TextBox内的TextBox.Template时，我总是得到

错误：40：BindingExpression路径错误：'object'上找不到'ViewModel'属性

有没有办法将DataContext内TextBox.Template设置为DataContext中的Parent？

<Style TargetType="{x:Type fields:CustomDateFieldView}">
     <Label Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ViewModel.Label}"/>
     <Setter Property="Template">
         <Setter.Value>
             <ControlTemplate TargetType="{x:Type fields:CustomDateFieldView}">
              ....
                <TextBox.Template>
                     <ControlTemplate> 
                         <StackPanel Orientation="Horizontal">
                         <TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ViewModel.Value}"/>
                          ....
                         </Stackpanel>
                    </ControlTemplate>
                </TextBox.Template>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 1

<Style TargetType="{x:Type fields:CustomDateFieldView}">
        <Label Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ViewModel.Label}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type fields:CustomDateFieldView}">
                                  ....
                   <TextBox.Template>
                        <ControlTemplate> 
                        <StackPanel Orientation="Horizontal">
                        <TextBox Text="{Binding ViewModel.Value, ElementName = myControlName}"/>
                           ....
                        </Stackpanel>
                   </TextBox.Template>

如果为CustomDateFieldView控件指定x：Name，则可以使用此方法。在我的例子中，我把ElementName myControlName。这要求myControlName.DataContext当然是你的viewmodel

编辑：如果第一种方法不起作用，你可以试试这个：

<Style TargetType="{x:Type fields:CustomDateFieldView}">
            <Label Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ViewModel.Label}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type fields:CustomDateFieldView}">
                                      ....
                       <TextBox.Template>
                            <ControlTemplate> 
                            <StackPanel Orientation="Horizontal">
                            <TextBox Text="{Binding ViewModel.Value, RelativeSource={RelativeSource AncestorType={x:Type fields:CustomDateFieldView}}}"/>
                               ....
                            </Stackpanel>
                       </TextBox.Template>

如何在TextBox.Template中获取Parent的DataContext？

1 个答案: