Question

我的表单中有一些文本框，它们的定义如下：

<TextBox Grid.Column="1" Grid.Row="0" x:Name="titleTextBox" Text="{Binding Path=Title}"  IsEnabled="{Binding Path=IsEditing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ec:DetailDataControl}}}"/>

但是我在运行时遇到了这个错误：

System.Windows.Data错误：4：无法找到绑定源，引用'RelativeSource FindAncestor，AncestorType ='MyProject.Controls.DetailDataControl'，AncestorLevel ='1''。 BindingExpression：路径= IsEditing;的DataItem = NULL; target元素是'TextBox'（Name ='titleTextBox'）; target属性为'IsEnabled'（类型'Boolean'）

为什么会这样，我该如何解决？

UPDATE1

IsEditting定义如下：

public static readonly DependencyProperty IsEditingProperty = DependencyProperty.Register(
            "IsEditing", typeof(Boolean), typeof(DetailDataControl), new PropertyMetadata(false));

public Boolean IsEditing
{
    get { return (Boolean)GetValue(IsEditingProperty); }
    set { SetValue(IsEditingProperty, value); }
}

UPDATE2

XAMl结构如下:(我删除了一些不相关的parst）

<ad:DocumentContent x:Class="MyProject.Controls.DetailDataControl"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:ec="clr-namespace:MyProject.Controls"
         xmlns:ecc="clr-namespace:MyProject.Classes.Converters"
         xmlns:ad="clr-namespace:AvalonDock;assembly=AvalonDock"
         mc:Ignorable="d"
         d:DesignHeight="300" d:DesignWidth="300">



<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
    <Grid.RowDefinitions>
        <RowDefinition Height="20"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition  Height="*"/>
    </Grid.RowDefinitions>
    <WrapPanel HorizontalAlignment="Right"  VerticalAlignment="Stretch" Grid.Row="0" >
        <Button Content="Edit" HorizontalAlignment="Right"  Name="editButton1" VerticalAlignment="Stretch" Click="editButton1_Click" />
    </WrapPanel>

    <Grid x:Name="pDataGrid" Margin="10,10,10,10" Grid.Row="1">
        <Grid.Resources>
            <ecc:InvertBooleanConverter  x:Key="boolConvert"/>
            <Style x:Key="BaseStyle" TargetType="Control">
                <Setter Property="HorizontalAlignment" Value="Stretch"/>
                <Setter Property="VerticalAlignment" Value="Stretch"/>
                <Setter Property="FontFamily" Value="Arial"/>
                <Setter Property="FontSize" Value="12" />

            </Style>

            <Style TargetType="Label" BasedOn="{StaticResource BaseStyle}" >
                <Setter Property="HorizontalAlignment" Value="Stretch"/>
                <Setter Property="VerticalAlignment" Value="Stretch"/>
                <Setter Property="Foreground" Value="Blue"/>
            </Style>
            <Style TargetType="TextBox" BasedOn="{StaticResource BaseStyle}">
            </Style>
            <Style TargetType="DatePicker" BasedOn="{StaticResource BaseStyle}" >
                <Setter Property="HorizontalAlignment" Value="Stretch"/>
                <Setter Property="VerticalAlignment" Value="Stretch"/>
                <Setter Property="IsHitTestVisible"  Value="{Binding Path=IsEditing, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ec:DetailDataControl}}}" />

            </Style>
            <Style TargetType="ComboBox" BasedOn="{StaticResource BaseStyle}">
                <Setter Property="IsEnabled" Value="{Binding Path=IsEditing, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ec:DetailDataControl}}}" />
            </Style>
            <Style TargetType="Button" BasedOn="{StaticResource BaseStyle}">
                <Setter Property="Width" Value="75" />
            </Style>
            <Style TargetType="RowDefinition"   >
                <Setter Property="Height" Value="30" />
                <Setter Property="SharedSizeGroup" Value="RowzSize"/>
            </Style>
            <Style x:Key="LabelColumnStyle" TargetType="ColumnDefinition"  >
                <Setter Property="Width" Value="*" />
                <Setter Property="SharedSizeGroup" Value="LabelColumnszSize"/>
            </Style>
            <Style x:Key="TextColumnStyle" TargetType="ColumnDefinition"   >
                <Setter Property="Width" Value="3*" />

            </Style>
        </Grid.Resources>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Style="{StaticResource LabelColumnStyle}"/>
            <ColumnDefinition Style="{StaticResource TextColumnStyle}"/>


        </Grid.ColumnDefinitions>

        <Label Content="Title" Grid.Column="0" Grid.Row="0" />
        <TextBox Grid.Column="1" Grid.Row="0" x:Name="titleTextBox" Text="{Binding Path=Title}"  IsEnabled="{Binding Path=IsEditing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ec:DetailDataControl}}}"/>

      </Grid>
    <TabControl Grid.Row="2" HorizontalAlignment="Stretch"  Name="tabControl1" VerticalAlignment="Stretch" >
        <TabItem Header="Address" Name="addresTabItem">
            <DataGrid  Name="addressDataGrid"  AutoGenerateColumns="False" ItemsSource="{Binding}" IsReadOnly="True">
                <DataGrid.Columns>
                    <DataGridTextColumn Binding="{Binding Path='Order'}" Header="Order" Width="*" />
                    <DataGridTextColumn Binding="{Binding Path='Address1'}" Header="Address1"   Width="3*" />
                    <DataGridTextColumn Binding="{Binding Path='Address2'}" Header="Address2" Width="3*" />
                    <DataGridTextColumn Binding="{Binding Path='Postcode'}" Header="Postcode" Width="*" />
                    <DataGridTextColumn Binding="{Binding Path='TelNo'}" Header="TelNo" Width="*" />
                    <DataGridTextColumn Binding="{Binding Path='MovedToAddressDate', StringFormat={}\{0:dd/MM/yyyy\}}" Header="Moved Date" Width="*" />
                    <DataGridTemplateColumn>
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button Content="Button" Tag="{Binding Path=ID}"  Name="editAddressButton" Click="editAddressButton_Click" />
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>

            </DataGrid>
        </TabItem>


    </TabControl>

</Grid>

Answer 1

如果你想做一些像

这样的事情

<ec:DetailDataControl></ec:DetailDataControl>

        <TextBox Grid.Column="1" Grid.Row="0" x:Name="titleTextBox" Text="{Binding Path=Title}"  IsEnabled="{Binding Path=IsEditing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ec:DetailDataControl}}}" Width="100"/>

肯定会给出

找不到引用'RelativeSource的绑定源 FindAncestor，AncestorType ='WpfApplication1.DetailDataControl'， AncestorLevel = '1'”。 BindingExpression：路径= IsEditing;的DataItem = NULL; target元素是'TextBox'（Name ='titleTextBox'）;目标属性是 'IsEnabled'（输入'Boolean'）

因为相对源查找祖先将始终搜索ec：DetailDataControl类型的父类。它永远不会考虑兄弟元素（同一级别的元素）查找祖先将查找ec：DetailDataControl类型的父级如果找不到ec：DetailDataControl类型的父级，那么它将查找下一级父级，它将搜索到它达到顶级父母，但从不考虑兄弟姐妹。

这是解决问题的一个简单方法。

<ec:DetailDataControl x:Name="ddc"></ec:DetailDataControl>

        <TextBox Grid.Column="1" Grid.Row="0" x:Name="titleTextBox" Text="{Binding Path=Title}"  IsEnabled="{Binding Path=IsEditing, ElementName=ddc}" Width="100"/>

WPF绑定不起作用

UPDATE1

UPDATE2

1 个答案: