WPF - 简单的相对路径 - FindAncestor [英] WPF - simple relative path - FindAncestor

问题描述

在工具提示下方的XAML正确结合​​的RelativeSource自我。但是，我不能为我的生活工作如何获得文本块中的注释块指SelectedItem.Description

In the XAML below the ToolTip correctly binds to RelativeSource Self. However, I can't for the life of me work out how to get the TextBlock in the commented block to refer to SelectedItem.Description

<Controls:RadComboBoxWithCommand x:Name="cmbPacking"
                                 Grid.Row="2"
                                 Grid.Column="5"
                                 ItemsSource="{Binding PackingComboSource}"
                                 DisplayMemberPath="DisplayMember"
                                 SelectedValuePath="SelectedValue"
                                 SelectedValue="{Binding ElementName=dataGrid1, Path=SelectedItem.PackingID}"
                                 ToolTip="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItem.Description}"
                                 IsSynchronizedWithCurrentItem="True"
                                 Style="{StaticResource comboBox}">
 <!--                    <Controls:RadComboBoxWithCommand.ToolTip>-->
                <!--                        <TextBlock Text="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItem.Description}" TextWrapping="Wrap" Width="50"/>-->
 <!--                    </Controls:RadComboBoxWithCommand.ToolTip>-->                   
</Controls:RadComboBoxWithCommand>

我想AP preciate任何建议

I would appreciate any suggestions

谢谢 - 杰里米

推荐答案

看来，由于工具提示没有一个家长，你需要绑定到下面的位置目标：

It seems that since ToolTip does not have a parent, you need to bind to the placement target as below:

<Controls:RadComboBoxWithCommand Grid.Row="2"
                                             Grid.Column="5"
                                             ItemsSource="{Binding PackingComboSource}"
                                             DisplayMemberPath="DisplayMember"
                                             SelectedValuePath="SelectedValue"
                                             SelectedValue="{Binding ElementName=dataGrid1, Path=SelectedItem.PackingID}"
                                             IsSynchronizedWithCurrentItem="True"
                                             Style="{StaticResource comboBox}">
                <Controls:RadComboBoxWithCommand.ToolTip>
                    <ToolTip DataContext="{Binding RelativeSource={RelativeSource Self}, Path=PlacementTarget}">
                        <TextBlock Text="{Binding SelectedItem.Description}"
                                   TextWrapping="Wrap"
                                   Width="100" />
                    </ToolTip>
                </Controls:RadComboBoxWithCommand.ToolTip>
            </Controls:RadComboBoxWithCommand>

希望这是有用的人
杰里米

Hope this is useful for someone Jeremy

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