Silverlight DataGrid.Celltemplate 绑定到 ViewModel [英] Silverlight DataGrid.Celltemplate Binding to ViewModel

问题描述

我正在实施 MVVC 模式，但无法从数据网格中的 DataTemplate 中绑定视图模型中的属性.如果我在列中的 DataTemplate 之外有一个文本块，它可以正常工作(因为我直接引用了 UserConrol 的数据上下文，即 VM)，但是在 DataTemplate 中它不会返回纯文本属性.然而，它将从迭代的 IEnumerable 项返回一个属性.

I am in the process of implimenting the MVVC pattern and am having trouble binding a property in the viewmodel from within a DataTemplate within a datagrid. If I have a textblock outside the DataTemplate in the column it works fine (since I am directly referencing the datacontext of the UserConrol, i.e. the VM) however from within the DataTemplate it wont return the plain text property. It will however return a property from the iterated IEnumerable item.

<UserControl xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"  
    x:Class="Timesheet.Silverlight.Modules.Views.HistoryView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     
    xmlns:Commands="clr-namespace:Microsoft.Practices.Composite.Presentation.Commands;assembly=Microsoft.Practices.Composite.Presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:ViewModels="clr-namespace:Timesheet.Silverlight.Modules.ViewModels" 
   x:Name="View">
    <StackPanel>            
    <TextBlock Text="{Binding Path=DataContext.testText, ElementName=View}" />    
            <data:DataGrid  Height="280" Width="500" ItemsSource="{Binding TimeSlots}" AutoGenerateColumns="False" >                        
            <data:DataGrid.Columns>
                <data:DataGridTextColumn Header="Allocation Area" Binding="{Binding TimeAllocationArea.TimeAllocationName}" Width="200" />
                <data:DataGridTextColumn Header="Start" Binding="{Binding StartTime}" Width="80" />
                <data:DataGridTextColumn Header="End" Binding="{Binding Path=DataContext.testText, ElementName=View}" Width="80" />
                <data:DataGridTemplateColumn Header="Modify" Width="200" >
                    <data:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="{Binding Path=DataContext.testText, ElementName=View}" />
                            </StackPanel>
                        </DataTemplate>
                    </data:DataGridTemplateColumn.CellTemplate>
                </data:DataGridTemplateColumn>
            </data:DataGrid.Columns>
        </data:DataGrid>    
    </StackPanel>
</UserControl>

我忽略的 DataTemplate 有什么问题吗??请注意，{Binding Path=DataContext.testText, ElementName=View}"适用于除 DataTemplate 中的元素之外的所有元素.(请注意，我知道 DG 外的第一个 Textblock 不需要 ElementName 等，但我只是通过这种方式向自己证明它引用了正确的内容)

Is there some sort of problem with the DataTemplate that im ignoring?? Note the "{Binding Path=DataContext.testText, ElementName=View}" works for all elements except the one in the DataTemplate. (Note I know that the 1st Textblock outside the DG doesnt need the ElementName etc but i have just done it this way to prove to myself that its referencing the right thing)

推荐答案

我不知道这是否适用于 SL，但您可以查看:

I don't know if this applies to SL, but you can check this out:

Columns 集合只是 Datagrid 中的一个属性；这个集合不在逻辑(或可视化)树中，因此 DataContext 没有被继承，这导致没有任何东西可以绑定."

"The Columns collection is just a property in the Datagrid; this collection is not in the logical (or visual) tree, therefore the DataContext is not being inherited, which leads to there being nothing to bind to."

http://blogs.msdn.com/jaimer/archive/2008/11/22/forwarding-the-datagrid-s-datacontext-to-its-columns.aspx

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