Show “No record found” message on a WPF DataGrid w

问题:

If there is no record available, I want to add a TextBlock on data grid, below the header, showing the message "No Record Found."

Consider the attached image for reference.

回答1:

Its been a long time since the question has been posted. But I thought this might be useful to someone else.

<Window.Resources>
   <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
</Window.Resources>

<DataGrid Name="dgProjects" ItemsSource="{Binding Projects}" AutoGenerateColumns="True" />

<TextBlock Text="Employee has no projects" Visibility="{Binding Items.IsEmpty, Converter={StaticResource BooleanToVisibilityConverter}, ElementName=dgProjects}" />

For simplicity purpose I have set AutoGenerateColumns="True". Please define the columns. This way when a empty datasource is bound, the column names will be shown along with 'Empty row' message.

回答2:

Finally I am able to findout the way.

1. When the grid in empty, add a default row on grid

2. Create a RowDetailTemplate which contain a text block with a message "No Record Found"

   <DataGrid.RowDetailsTemplate>
       <DataTemplate>
           <StackPanel>
               <TextBlock Text="No Record Found" Width="400"></TextBlock>
           </StackPanel>
       </DataTemplate>
   </DataGrid.RowDetailsTemplate>
   

3. Set the style on datagrid

   <DataGrid.Style>
       <Style TargetType="DataGrid">
           <Setter Property="RowDetailsVisibilityMode" Value="Collapsed"></Setter>
           <Style.Triggers>
               <DataTrigger Binding="{Binding DataContext.IsRecordExists, 
                                       RelativeSource={RelativeSource Mode=FindAncestor,
                                       AncestorType={x:Type local:MainWindow}}}" Value="false">
                   <Setter Property="RowHeight" Value="0"></Setter>
                   <Setter Property="RowDetailsVisibilityMode" Value="Visible"></Setter>
               </DataTrigger>
           </Style.Triggers>
       </Style>
   </DataGrid.Style>
   

By default (record available on datagrid) row detail template will be collapsed.

DataTrigger that checks CLR poperty, if it is false then show the row detail template.

The reason for setting the rowheight as 0 to hide the default row which we haved added on 1st step.

回答3:

I find that it is easy to center a text block over the grid and set its visibility based on the number of rows. I am usually using MVVM and will bind the visibility to a View Model property:

<Grid>
    <toolkit:DataGrid>
        <toolkit:DataGrid.Columns>
           .
           .
           .
        </toolkit:DataGrid.Columns>
    </toolkit:DataGrid>
    <TextBlock Text="No Records Found" HorizontalAlignment="Center"  VerticalAlignment="Center" Visibility="{Binding EmptyMessageVisibility, Mode=OneWay, FallbackValue=Visible}" />
</Grid>

回答4:

1. Add the grid inside the stackpanel
2. Place below border code next to datagrid

<Border HorizontalAlignment="Stretch" VerticalAlignment="Center" 
        BorderThickness="1,0,1,1" BorderBrush="Black" Height="35">
    <Border.Style> 
        <Style TargetType="Border">
            <Setter Property="Visibility" Value="Collapsed" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding YourListName.Count}" Value="0">
                    <Setter Property="Visibility" Value="Visible" />
                </DataTrigger>
            </Style.Triggers>
        </Style> 
    </Border.Style> 
    <TextBlock Text="No record fount" HorizontalAlignment="Center"
               VerticalAlignment="Center" /> 
</Border>

It will show/hide based on your collection/list count.