Tootip 如何设置动态的样式。

Question

我的DataGrid中有很多不同类型的数据，在数据库中存储的是一样的。是在Grid中现在的时候没有特别的要求，可是在tootlip 中显现有一定的要求。他要更加不同的类型选择不同的方式，小弟只知道如何设置样式，可是在设置之前它的数据需要转换一次，根据不同的类型显示不同的数据。  本人在这里绞尽脑汁未能想到一个很好的办法。请高人指点，我在绑定的时候使用IValueConerter 方式转换数据，但是不知道如何设置tootlip 的模板选择器，或者样式。请高手赐教。

Answer 1

其实不用你这么麻烦，我们完全可以通过WPF提供的 DataTemplateSelector 来实现同台根据数据选择不同Template。 下面是一个简单的例子，用不同的模板来显示不同数据类型的。

      <DataGrid ItemsSource="{Binding Items}" CanUserAddRows="False" AutoGenerateColumns="False">
        <DataGrid.Resources>
          <DataTemplate x:Key="StringTemplate">
            <StackPanel>
              <TextBlock Text="This is String Type Cell - "/>
              <TextBlock Text="{Binding}"/>
            </StackPanel>
          </DataTemplate>

          <DataTemplate x:Key="IntTemplate">
            <StackPanel>
              <TextBlock Text="This is Int Type Cell - "/>
              <TextBlock Text="{Binding}"/>
            </StackPanel>
          </DataTemplate>

          <DataTemplate x:Key="DoubleTemplate">
            <StackPanel>
              <TextBlock Text="This is Double Type Cell - "/>
              <TextBlock Text="{Binding}"/>
            </StackPanel>
          </DataTemplate>
          
          <DataTemplate x:Key="CustomClassTemplate">
            <StackPanel>
              <TextBlock Text="This is CustomClass Type Cell - "/>
              <TextBlock Text="{Binding}"/>
            </StackPanel>
          </DataTemplate>
 
        </DataGrid.Resources>
        <DataGrid.Columns>
          <DataGridTextColumn Header="String" Binding="{Binding StringCell}" Width="*">
            <DataGridTextColumn.CellStyle>
              <Style TargetType="{x:Type DataGridCell}">
                <Setter Property="ToolTip">
                  <Setter.Value>
                    <ContentControl Content="{Binding StringCell}" ContentTemplateSelector="{StaticResource CellDataTemplateSelector}"/>
                  </Setter.Value>
                </Setter>
              </Style>
            </DataGridTextColumn.CellStyle>
          </DataGridTextColumn>
          <DataGridTextColumn Header="Int" Binding="{Binding IntCell}" Width="*">
            <DataGridTextColumn.CellStyle>
              <Style TargetType="{x:Type DataGridCell}">
                <Setter Property="ToolTip">
                  <Setter.Value>
                    <ContentControl Content="{Binding IntCell}" ContentTemplateSelector="{StaticResource CellDataTemplateSelector}"/>
                  </Setter.Value>
                </Setter>
              </Style>
            </DataGridTextColumn.CellStyle>
          </DataGridTextColumn>
          <DataGridTextColumn Header="Double" Binding="{Binding DoubleCell}" Width="*">
            <DataGridTextColumn.CellStyle>
              <Style TargetType="{x:Type DataGridCell}">
                <Setter Property="ToolTip">
                  <Setter.Value>
                    <ContentControl Content="{Binding DoubleCell}" ContentTemplateSelector="{StaticResource CellDataTemplateSelector}"/>
                  </Setter.Value>
                </Setter>
              </Style>
            </DataGridTextColumn.CellStyle>
          </DataGridTextColumn>
          <DataGridTextColumn Header="Custom Class" Binding="{Binding CustomClassCell}" Width="*">
            <DataGridTextColumn.CellStyle>
              <Style TargetType="{x:Type DataGridCell}">
                <Setter Property="ToolTip">
                  <Setter.Value>
                    <ContentControl Content="{Binding CustomClassCell}" ContentTemplateSelector="{StaticResource CellDataTemplateSelector}"/>
                  </Setter.Value>
                </Setter>
              </Style>
            </DataGridTextColumn.CellStyle>
          </DataGridTextColumn>
        </DataGrid.Columns>
      </DataGrid>

C#：

  public partial class MainWindow : Window
  {
    public ObservableCollection<Item> Items { get; set; }
    public MainWindow()
    {
      InitializeComponent();
      Items = new ObservableCollection<Item>();
      for (int i = 0; i < 100; i++)
        Items.Add(new Item());
      this.DataContext = this;
    }
  }
  public class CellDataTemplateSelector : DataTemplateSelector
  {
    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
      FrameworkElement element = container as FrameworkElement;

      if (element != null && item != null)
      {
        if (item is string)
          return element.FindResource("StringTemplate") as DataTemplate;
        else if (item is int)
          return element.FindResource("IntTemplate") as DataTemplate;
        else if (item is double)
          return element.FindResource("DoubleTemplate") as DataTemplate;
        else if (item is CustomClass)
          return element.FindResource("CustomClassTemplate") as DataTemplate;
      }
      return null;
    }
  }

  #region DataModel
  public class Item
  {
    static int ID;
    public string StringCell { get; set; }
    public int IntCell { get; set; }
    public double DoubleCell { get; set; }
    public CustomClass CustomClassCell { get; set; }

    public Item()
    {
      StringCell = "StringCell " + ID.ToString();
      IntCell = ID;
      DoubleCell = ID * 0.01;
      CustomClassCell = new CustomClass();
      ID++;
    }
  }
  public class CustomClass { }
  #endregion

完整例子下载： https://skydrive.live.com/?cid=51b2fdd068799d15#cid=51B2FDD068799D15&id=51B2FDD068799D15%21951

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Bob Bao [MSFT]
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