Unable to set DataGridColumn's ToolTip

问题:

I tried the following:

<tk:DataGridTextColumn 
    Header="Item" 
    Binding="{Binding Item.Title}" 
    ToolTipService.ToolTip="{Binding Item.Description}" />

And I don't see any tool tip.

Any ideas? Is it even implemented?

回答1:

This works for me:

<Style TargetType="{x:Type Custom:DataGridColumnHeader}">
   <Style.Triggers>
      <Trigger Property="IsMouseOver" Value="True">
          <Setter Property="ToolTip" Value="{Binding Column.(ToolTipService.ToolTip), RelativeSource={RelativeSource Self}}"/>
      </Trigger>
   </Style.Triggers>
</Style>

回答2:

pls, check if the code below would work for you, it should be displaying tooltips for columns headers and cells, cell's tooltip should be bent the Description field of the data object:

<DataGridTextColumn Width="SizeToCells"   
                    MinWidth="150" 
                    Binding="{Binding Name}">

    <DataGridTextColumn.Header>
        <TextBlock Text="Name" ToolTipService.ToolTip="Header ToolTip" />
    </DataGridTextColumn.Header>

    <DataGridTextColumn.ElementStyle>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="ToolTip" Value="{Binding Description}" />
            <Setter Property="TextWrapping" Value="Wrap" />
        </Style>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>

solution found here: 5 Random Gotchas with the WPF DataGrid

回答3:

The DataGridTextColumn is not visible. You have to set tooltips on the header or the content.

To set a ToolTip on the header, change the Header to a TextBlock:

<tk:DataGridTextColumn
  Binding="{Binding Item.Title}">
  <tk:DataGridTextColumn.Header>
    <TextBlock
      Text="Text" 
      ToolTipService.ToolTip="Tooltip for header" />
  </tk:DataGridTextColumn.Header>
</tk:DataGridTextColumn>

To set a ToolTip on the column contents, set it in the Style:

<tk:DataGridTextColumn
  Binding="{Binding Item.Title}"
  Heading="Text">
  <tk:DataGridTextColumn.ElementStyle>
    <Style>
      <Setter Property="ToolTipService.ToolTip" Value="{Binding Item.Description}" />
    </Style>
  </tk:DataGridTextColumn.ElementStyle>
</tk:DataGridTextColumn>

You may also want to set EditingElementStyle.

回答4:

Additionally, if your column is a DataGridTemplateColumn instead of a DataGridTextColumn, you can do it like this:

<DataGridTemplateColumn x:Name="MyCheckBoxColumn" CellStyle="{StaticResource MyCellStyle}" >
    <DataGridTemplateColumn.HeaderTemplate>
        <DataTemplate>
            <TextBlock Text="MyHeaderName" ToolTip="This is my column description" />
        </DataTemplate>
    </DataGridTemplateColumn.HeaderTemplate>
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <CheckBox ... />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

回答5:

Set ToolTipService.ToolTip Property in Header style:

<Setter Property="ToolTipService.ToolTip" Value="{x:Static res:StringResources.List_Dialog_SelectAll_Checkbox}"/>

Here it is how I used it when I had image in DataGridCheckBoxColumn instead of text. XAML:

    <Window x:Class="MyProject.GUI.ListDialog"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:viewModel="clr-MyProject.GUI.ViewModels" 
            Title="{Binding Title}"  Height="350" Width="650"
            MinHeight="350" MinWidth="650"
            xmlns:res="clr-MyProject.GUI.Resources" Closing="Window_Closing" WindowStyle="ToolWindow">
    <Window.Resources>
            <BitmapImage x:Key="MyImageSource" UriSource="Resources/Images/SelectDeselect.png" />
           <Style x:Key="CheckBoxHeader"  TargetType="DataGridColumnHeader">
                <Setter Property="HorizontalContentAlignment" Value="Center"/>
                <Setter Property="VerticalContentAlignment" Value="Center"/>
                            <Setter Property="ToolTipService.ToolTip" Value="{x:Static res:StringResources.List_Dialog_SelectAll_Checkbox}"/>
                <Setter Property="ContentTemplate">
                    <Setter.Value>
                        <DataTemplate>
                            <Image Width="15" Height="15" Source="{StaticResource MyImageSource}" />
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
    </Window.Resources>

C#:

DataGridCheckBoxColumn checkColumn = new DataGridCheckBoxColumn();
checkColumn.HeaderStyle = new System.Windows.Style();
checkColumn.CanUserSort = checkColumn.CanUserResize = false;
checkColumn.Width = new DataGridLength(25);
checkColumn.HeaderStyle = (Style)Resources["CheckBoxHeader"];
checkColumn.CellStyle = (Style)Resources["CenterAlignedCellStyle"];
checkColumn.IsReadOnly = false;
dataGrid.Columns.Add(checkColumn);