WPF datagrid标题文本绑定 [英] WPF datagrid header text binding

问题描述

由于某些原因，DataGrid的列标题不是FrameWork元素，因此您无法使用绑定来设置标题文本。请更正我，如果这是错误的，如果这已经改变了.NET 4.0（我现在使用最新的WPFToolkit从CodePlex）。

The column header of the DataGrid is not a FrameWork element for some reason, and so you cannot use bindings to set things like the header text. Please correct me if that is wrong of if that has changed with .NET 4.0 (I am using the latest WPFToolkit from CodePlex now).

我试图使用DataGrid对于时间表介绍，日期应该是标题文本的一部分（即Sun，11月01日），我在XAML中有以下内容：

I am trying to use the DataGrid for a time sheet presentation where the day's date should be part of the header text (ie, "Sun, Nov 01"), and I have the following in my XAML:

        <dg:DataGrid.Columns>
        <dg:DataGridTextColumn Header="Description" Width="Auto" Binding="{Binding Description}" IsReadOnly="True"/>
        <dg:DataGridTextColumn Header="Mon" Width="50" Binding="{Binding Allocations[0].Amount}"  />
... every other day of the week ....
        <dg:DataGridTextColumn Header="Sun" Width="50" Binding="{Binding Allocations[6].Amount}"  />
        <dg:DataGridTextColumn Header="Total" MinWidth="50" Binding="{Binding TotalAllocatedAmount}" IsReadOnly="True" />
    </dg:DataGrid.Columns>

我想使用我用于数据的相同AllocationViewModel（即{Binding Allocations [0] .Amount}，并将其DisplayName属性绑定到标题文本。有人可以告诉我如何做到这一点吗？如果我必须使用静态资源，我该如何获取DataContext？

I'd like to use the same AllocationViewModel I am using for data (ie, "{Binding Allocations[0].Amount}" and bind it's DisplayName property to the header text. Can someone show me how to do that? If I have to use a static resource, how can I get the DataContext in there?

编辑----------------首选工作

EDIT ---------------- PREFERRED WORK-AROUND

Josh Smith发布了 DataContextSpy ，这是我遇到这个问题的最简单的解决方法，这是让它工作的类：

Josh Smith had posted about a DataContextSpy awhile back, and it is the cleanest workaround I have come across to this problem. Here is the class that makes it work:

/// <summary>
/// Workaround to enable <see cref="DataContext"/> bindings in situations where the DataContext is not redily available. 
/// </summary>
/// <remarks>http://blogs.infragistics.com/blogs/josh_smith/archive/2008/06/26/data-binding-the-isvisible-property-of-contextualtabgroup.aspx</remarks>
public class DataContextSpy : Freezable
{
    public DataContextSpy()
    {
        // This binding allows the spy to inherit a DataContext.
        BindingOperations.SetBinding(this, DataContextProperty, new Binding());
    }

    public object DataContext
    {
        get { return GetValue(DataContextProperty); }
        set { SetValue(DataContextProperty, value); }
    }

    // Borrow the DataContext dependency property from FrameworkElement.
    public static readonly DependencyProperty DataContextProperty = FrameworkElement
        .DataContextProperty.AddOwner(typeof (DataContextSpy));

    protected override Freezable CreateInstanceCore()
    {
        // We are required to override this abstract method.
        throw new NotImplementedException();
    }
}

有了这个，我可以劫持DC需要在xaml中：

With this in place, I can hijack the DC I need in xaml:

    <dg:DataGrid.Resources>
        <behavior:DataContextSpy x:Key="spy" DataContext="{Binding Allocations}" />
    </dg:DataGrid.Resources>

然后根据需要通过绑定进行申请：

And then apply as needed via binding:

            <dg:DataGridTextColumn Header="{Binding Source={StaticResource spy}, Path=DataContext[0].DisplayName}" 
                               Width="50" Binding="{Binding Allocations[0].Amount}"  />

Suh-weet！

推荐答案

这是将DataGridTextColumn头绑定到数据上下文的简单方法：

This is the easy way to bind the DataGridTextColumn header to the data context:

<DataGrid x:Name="summaryGrid" Grid.Row="3" AutoGenerateColumns="False" IsReadOnly="True" CanUserAddRows="False">
       <DataGrid.Columns>
            <DataGridTextColumn Header="Hard Coded Title" Width="*"/>
            <DataGridTextColumn Width="100">
                <DataGridTextColumn.Header>
                    <TextBlock Text="{Binding DataContext.SecondColumnTitle, 
                                              RelativeSource={RelativeSource AncestorType={x:Type local:MainWindow}}/>
                </DataGridTextColumn.Header>
            </DataGridTextColumn>
            <DataGridTextColumn Width="150">
                <DataGridTextColumn.Header>
                    <TextBlock Text="{Binding DataContext.ThirdColumnTitle, 
                                              RelativeSource={RelativeSource AncestorType={x:Type local:MainWindow}}/>
                </DataGridTextColumn.Header>
            </DataGridTextColumn>
        </DataGrid.Columns>
    </DataGrid>

你显然需要有属性： SecondColumnTitle 和 ThirdColumnTitle 实现在您的数据上下文类。

You will obviously need to have properties: SecondColumnTitle and ThirdColumnTitle implemented on your data context class.

我有这个解决方案在.net 4.5中工作，没有有机会也没有理由在早期版本的框架中尝试。

I have this solution working in .net 4.5 and did not have a chance nor reason to try it in earlier versions of the framework.

这篇关于WPF datagrid标题文本绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！