如何为基于ItemsControl的控件(如ListView或DataGrid)定义空的DataTemplate [英] How-to define Empty DataTemplate for the ItemsControl based controls like ListView or DataGrid

问题描述

像ListView这样的ASP.NET控件允许通过设置

ASP.NET controls like ListView allows providing a custom template by setting the ListView.EmptyDataTemplate property, this template will be rendered in case of empty data source.

对于 ItemsControl 的控件，例如 ListView 和 DataGrid ?因此，当 ItemsSource 为空.

How to do the same in WPF (XAML only preferrable) for ItemsControl based controls like ListView and DataGrid? So I want to show my custom DataTemplate in case when ItemsSource is empty.

推荐答案

您可以使用基于DataTrigger的Template属性设置

You can use set the Template property based on a DataTrigger

例如

在资源中:

<ControlTemplate x:Key="EmptyListBoxTemplate">
     <TextBlock Text="Items count == 0" />
</ControlTemplate>

控件本身:

<ListBox ItemsSource="{Binding SomeCollection}">
    <ListBox.Style>
        <Style TargetType="{x:Type ListBox}">
            <Style.Triggers>
                <DataTrigger Value="{x:Null}" Binding="{Binding DataContext.SomeCollection, RelativeSource={RelativeSource Self}}">
                    <Setter Property="Template" Value="{StaticResource EmptyListBoxTemplate}" />
                </DataTrigger>
                <DataTrigger Value="0" Binding="{Binding DataContext.SomeCollection.Count, RelativeSource={RelativeSource Self}}">
                    <Setter Property="Template" Value="{StaticResource EmptyListBoxTemplate}" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ListBox.Style>
</ListBox>

可能会有一种更简单的绑定方法，但是我现在没有编译器来弄清楚它是什么:)

There might be an simplier way of doing the binding, but I don't have a compiler on me right now to figure out what it would be :)

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