DataGridTextColumn 的条件工具提示

Question

我的 DataGridTextColumn 目前遇到一个小问题。

我想在 DataGridTextColumn 上显示工具提示，但前提是文本不为空。

我怎样才能做到这一点？我目前使用的代码：

                <DataGridTextColumn IsReadOnly="True" Header="Person" Binding="{Binding SomeBinding, TargetNullValue='-'}" Width="Auto"
                CellStyle="{StaticResource SomeStyle}"/>

搭配风格

            <Style x:Key="SomeStyle" 
           TargetType="DataGridCell" BasedOn="{StaticResource InactiveStyle}">
        <Style.Setters>
            <Setter Property="ToolTip" Value="{Binding Path=SomeBinding}"/>
        </Style.Setters>
            </Style>

此代码确实为我提供了工具提示，但是，当没有文本时，它也会显示工具提示。如果有任何问题，请告诉我，我可以为您提供帮助。

Answer 1

尝试为string.Empty和null添加数据触发器：

<Style x:Key="SomeStyle" TargetType="DataGridCell" 
       BasedOn="{StaticResource InactiveStyle}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding Path=SomeBinding}" Value="">
            <Setter Property="ToolTip" Value="{x:Null}"/>
        </DataTrigger>
        <DataTrigger Binding="{Binding Path=SomeBinding}" Value="{x:Null}">
            <Setter Property="ToolTip" Value="{x:Null}"/>
        </DataTrigger>
    </Style.Triggers>
    <Style.Setters>
        <Setter Property="ToolTip" Value="{Binding Path=SomeBinding}"/>
    </Style.Setters>
</Style>

Answer 2

这是一种方法：

    //Create a class which inherits from IValueConverter
    public class CellToolTipConverter : IValueConverter
    {
     #region IValueConverter Membres

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string stringValue = (string)value;
        if (!string.IsNullOrEmpty(stringValue))
            return  "Your tooltip";//As you are in a c# class, you have many possibilities.
       else
        return string.Empty;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
   }



     //In your xaml :

     //Declare your namespace
     xmlns:CustomClasses="clr-namespace:YourAssamblyName.YourNameSpaceOfConverterClass"


     <UserControl.Resources>
         <CustomClasses:CellToolTipConverter x:Key="CustomToolTipConverter"/>              
     </UserControl.Resources>



        //In your grid view
        <GridView.RowStyle>
            <Style TargetType="{x:Type telerik:GridViewRow}">
                <Setter Property="MyCustomToolTipProperty" Value="{Binding YourProperty, Converter= 
     {StaticResource CustomToolTipConverter}}"/>
            </Style>
        </GridView.RowStyle>