MVVM将DataGrid绑定到DataTable显示错误的列名

Question

I am new to C# WPF, Anyone have come across the case before? (MVVM)

I bind the ItemSource of a DataGrid to a DataTable. When I use SQL command "Select * from Testing1" (its connecting to a MDB file), all the data are corrected populated in the DataGrid, except the column Name has some issue. "Underscore" was missing strangely in the column name. I tested below case:

• The correct Column Name is "Testing_Field_3", while it display "TestingField_3".
• The correct Column Name is "Testing_ Field_ _4", while it display "Testing_Field_4". (Displaying underscore in this website have some issue. The case should be that 2 underscore converted to 1 underscore)

When debugging, I checked the DataTable/Recordset, and the column name is correct and no issue.

Below is the extracted part of my xaml:

<DataGrid Grid.Column="0" Grid.Row="1" Width="650" Height="300" Margin="5,5,0,0" AutoGenerateColumns="True" HorizontalAlignment="Left" VerticalAlignment="Top" ItemsSource="{Binding Path=SqlDataTbl, Mode=OneWay, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}" />

If it was a bug in C#, any alternative for this?

Kindly appreciate help from you guys and thanks in advance.

Answer 1

Reason for this behaviour is ContentPresenter.RecognizesAccessKey which is by default true for datagrid header contentPresenter . If this property is true, it uses AccessText in text of header.

Workaround for this is to hook to AutoGeneratingColumn event of dataGrid and replace all single underscore with double underscores. Sample is shown below -

<DataGrid AutoGeneratingColumn="DataGrid_AutoGeneratingColumn"/> 

and in event handler -

private void DataGrid_AutoGeneratingColumn(object sender, 
                                    DataGridAutoGeneratingColumnEventArgs e)
{
   e.Column.Header = e.Column.Header.ToString().Replace("_", "__");
}

---

Also you can achieve that by overriding ContentTemplate of DataGridColumnHeader . Use TextBlock inside it which does not recognizes access key from a text.

<DataGrid ItemsSource="{Binding Objects}">
  <DataGrid.ColumnHeaderStyle>
     <Style TargetType="{x:Type DataGridColumnHeader}"
            BasedOn="{StaticResource {x:Type DataGridColumnHeader}}">
        <Setter Property="ContentTemplate">
            <Setter.Value>
                <DataTemplate>
                    <TextBlock Text="{TemplateBinding Content}" 
                               HorizontalAlignment="Center"/>
                 </DataTemplate>
            </Setter.Value>
        </Setter>
     </Style>
  </DataGrid.ColumnHeaderStyle>
</DataGrid>