WPF DataGrid：空行缺失 [英] WPF DataGrid: Blank Row Missing

问题描述

我正在使用 DataGrid 创建一个WPF窗口，我想显示网格底部的空白新项目行，允许我添加一个新项目到网格。由于某些原因，空白行不会显示在我的窗口上的网格上。以下是我用来创建 DataGrid 的标记：

I am creating a WPF window with a DataGrid, and I want to show the blank "new item" row at the bottom of the grid that allows me to add a new item to the grid. For some reason, the blank row is not shown on the grid on my window. Here is the markup I used to create the DataGrid:

<toolkit:DataGrid  x:Name="ProjectTasksDataGrid" 
                   DockPanel.Dock="Top" 
                   Style="{DynamicResource {x:Static res:SharedResources.FsBlueGridKey}}"
                   AutoGenerateColumns="False" 
                   ItemsSource="{Binding SelectedProject.Tasks}" 
                   RowHeaderWidth="0" 
                   MouseMove="OnStartDrag" 
                   DragEnter="OnCheckDropTarget" 
                   DragOver="OnCheckDropTarget" 
                   DragLeave="OnCheckDropTarget" 
                   Drop="OnDrop" 
                   InitializingNewItem="ProjectTasksDataGrid_InitializingNewItem">
    <toolkit:DataGrid.Columns>
        <toolkit:DataGridCheckBoxColumn HeaderTemplate="{DynamicResource {x:Static res:SharedResources.CheckmarkHeaderKey}}" Width="25" Binding="{Binding Completed}" IsReadOnly="false"/>
        <toolkit:DataGridTextColumn Header="Days" Width="75" Binding="{Binding NumDays}" IsReadOnly="false"/>
        <toolkit:DataGridTextColumn Header="Due Date" Width="75" Binding="{Binding DueDate, Converter={StaticResource standardDateConverter}}" IsReadOnly="false"/>
        <toolkit:DataGridTextColumn Header="Description" Width="*" Binding="{Binding Description}" IsReadOnly="false"/>
    </toolkit:DataGrid.Columns>
</toolkit:DataGrid>

我不知道为什么空白行不显示。我已经尝试了明显的东西（ IsReadOnly =false， CanUserAddRows =True），没有运气。任何想法为什么空白行被禁用？感谢您的帮助。

I can't figure out why the blank row isn't showing. I have tried the obvious stuff (IsReadOnly="false", CanUserAddRows="True"), with no luck. Any idea why the blank row is disabled? Thanks for your help.

推荐答案

Vincent Sibal发布了一个文章描述添加新行到DataGrid需要什么。有很多可能性，大部分取决于您使用的集合类型 SelectedProject.Tasks 。

Vincent Sibal posted an article describing what is required for adding new rows to a DataGrid. There are quite a few possibilities, and most of this depends on the type of collection you're using for SelectedProject.Tasks.

我建议确保任务不是只读集合，并且它支持所需的接口之一（在上一个链接中提到），以允许使用DataGrid正确添加新项。

I would recommend making sure that "Tasks" is not a read only collection, and that it supports one of the required interfaces (mentioned in the previous link) to allow new items to be added correctly with DataGrid.

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