Disable Editing in rows if first Cell is empty for a datagrid in WPF

Question

I am binding a DataTable to Datagrid. Number of columns and rows in datatable is determined at runtime. But number of rows displayed in datagrid is fixed to 36.

So if sometimes datatable have <36 rows, empty rows are displayed to maintain height of datagrid. Reason behind doing this is that I am printing the Grid containing datagrid and I dont want to mess up Height and Width of print template.

    <DataGrid x:Name="TestPointsDataGrid" ItemsSource="{Binding TestPointsTable,Mode=TwoWay}" HorizontalScrollBarVisibility="Disabled" 
CanUserResizeColumns="False" CanUserResizeRows="False" MouseRightButtonUp="DataGrid_MouseRightButtonUp"   
                                      CanUserAddRows="False" >

To disable first and last columns I did below style triggers :

    <Style TargetType="{x:Type DataGridCell}">
       <Style.Triggers>
          <Trigger Property="IsMouseOver" Value="True">
             <Setter Property="Background" Value="Aqua"></Setter>
          </Trigger>
          <DataTrigger Value="Type" Binding="{Binding Path=Column.Header, RelativeSource={RelativeSource Self}}">
              <Setter Property="IsEnabled"  Value="false" />
              <Setter Property="FontWeight" Value="DemiBold"/>
           </DataTrigger>
           <DataTrigger Value="B or A" Binding="{Binding Path=Column.Header, RelativeSource={RelativeSource Self}}">
               <Setter Property="IsEnabled"  Value="false" />
               <Setter Property="FontWeight" Value="DemiBold"/>
               <Setter Property="Foreground" Value="Black"/>
            </DataTrigger>
       </Style.Triggers>
   </Style>

Example :

As shown in above images, numbers of columns are unknown. First column and last column is always fixed in my case. i.e. "Type" and "B or A" respectively. I was able to set IsEnabled = false for these columns.

If there is something in first column, let user edit that row except first and last column. How do I set those empty rows' IsEnabled property to false ? Or just any workaround to prevent user from typing anything in those rows except not displaying those rows.

AQuirky AQuirky · Accepted Answer · 2017-03-29T16:40:53

The easiest thing for you to do is to add a BeginningEdit event handler and cancel the edit if the row that the user is trying to edit is empty...

<DataGrid x:Name="dataGrid" ItemsSource="{Binding PartCollection}" AutoGenerateColumns="True" BeginningEdit="dataGrid_BeginningEdit">

    private void dataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
    {
        if((e.Row.Item as Part).Manufacturer == "XYZ")
        {
            e.Cancel = true;
        }
    }

Disable Editing in rows if first Cell is empty for a datagrid in WPF

1 Answers