WPF DataGrid - Why the extra column

Question

I have a WPF app that uses DataGrid to display some data. When I run the program there is an additional column as shown here:

Answer 1

Well since its unused space, another way around will be use a weighted width rather than fixed one. You can use a hybrid approach as well wherein some are fixed and some are weighted, in that case ensure one is weighted (*) So in your code it will be :

<DataGridTextColumn Header="PerceptionistID" Binding="{Binding PerceptionistID}" Width="4*" />
        <DataGridTextColumn Header="Week Of" Binding="{Binding WeekOf, StringFormat={}{0:MM/dd/yyyy}}" Width="3*" />
        <DataGridTextColumn Header="Regular Hours" Binding="{Binding WorkHours}" Width="4*" />
        <DataGridTextColumn Header="PTO Hours" Binding="{Binding PTOHours}" Width="4*" />
        <DataGridTextColumn Header="Holiday Hours" Binding="{Binding HolidayHours}" Width="4*" />

Answer 2

The "extra column" is actually just unused space. Each of your columns define a Width value, so once they get assigned there is space left over.

If you want to get rid of that space, make at least one of your columns a * column so it stretches to fill available space.

My best guess as to why it looks normal in Visual Studio is probably because you have the designer width set to something smaller than the runtime width. If it were larger, you'd see the same thing.

If you don't want your control to stretch, then be sure to set it's (or it's parent's) horizontal/vertical alignment to something other than Stretch

<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
    <ItemsControl ItemsSource="{Binding ViewModels}" Margin="3" />
</StackPanel>

Answer 3

Put ColumnWidth="*" in the XAML and it will surely be work.

<DataGrid x:Name="DG_FileShow" ColumnWidth="*" ItemsSource="{Binding}" 
 HorizontalAlignment="Left" VerticalAlignment="Top" Height="345" Width="654" 
 Margin="34,53,0,0" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Names" Binding="{Binding}" />
        </DataGrid.Columns>
 </DataGrid>

Answer 4

The area on the left that you are seeing is the Row Headers. Set the HeadersVisibility to either "Column" or "None" (depending on which you want)