C#-RowHeaderTemplateSelector对象参数为null

嗨,我正在使用WpfToolKit DataGrid并想根据项目类型动态设置RowHeaderTemplate,在我的代码中object参数始终为null
这是我的代码

a

  <DataTemplate x:Key="WithCheckBox">
            <Grid>
                <CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type wpftk:DataGridRow}}}"/>
            </Grid>
     </DataTemplate>
    <viewModel:CheckBoxRowDataTemplate x:Key="CheckBoxRowDataTemplate"/> 

   <wpftk:DataGrid   RowHeaderTemplateSelector="{StaticResource CheckBoxDataDataTemplate}">

C#

 public class CheckBoxRowDataTemplate : DataTemplateSelector
{

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        FrameworkElement element = (FrameworkElement)container;

        if(element != null && item != null & item is Item)
        {
            if(((Item)item).ItemType  != 3 )
            {
                return element.FindResource("WithCheckBox") as DataTemplate;
            }
            else
            {
               return element.FindResource("WithoutCheckBox") as DataTemplate;
            }
        }
        return null;
    }
}

解决方法:

我知道这是一岁的帖子,但是希望这对某人有帮助！

微软是这样说的：

The RowHeaderTemplate does not inherit the data context from the
DataGrid.

该文档进一步说：

To set the row header content to display values based on the row data,
bind to the Content property of the DataGridRowHeader by using the
RowHeaderStyle property.

这是链接：https://msdn.microsoft.com/en-us/library/system.windows.controls.datagrid.rowheadertemplate(v=vs.110).aspx

因此,您需要做的是在datagrid xaml中添加以下内容：

<DataGrid.RowHeaderStyle>
<Style TargetType="{x:Type DataGridRowHeader}">
<Setter Property="Content" Value="{Binding}" />
</Style>
</my:DataGrid.RowHeaderStyle>

现在,object参数应该带回绑定到DataGridRow的项目.

标签：datatemplate,xaml,c
来源： https://codeday.me/bug/20191120/2040580.html