wpf datagrid : create a DatagridNumericColumn in wpf

Question

I have a requirement that I want to make a datagridcolumn which only accepts numeric values(integer) ,when the user enter something other than numbers handle the textbox . I tried a lot of webpages ,Iam tired of these ,I greately appreciate anybody have the helping mind.

Answer 1

Based on @nit suggestion, you can create your own class derived from DataGridTextColumn like this:

public class DataGridNumericColumn : DataGridTextColumn
{
    protected override object PrepareCellForEdit(System.Windows.FrameworkElement editingElement, System.Windows.RoutedEventArgs editingEventArgs)
    {
        TextBox edit = editingElement as TextBox;
        edit.PreviewTextInput += OnPreviewTextInput;

        return base.PrepareCellForEdit(editingElement, editingEventArgs);
    }

    void OnPreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
    {
        try
        {
            Convert.ToInt32(e.Text);
        }
        catch
        {
            // Show some kind of error message if you want

            // Set handled to true
            e.Handled = true;
        }
    }
}

In the PrepareCellForEdit method you register the OnPreviewTextInput method to the editing TextBox PreviewTextInput event, where you validate for numeric values.

In xaml, you simply use it:

    <DataGrid ItemsSource="{Binding SomeCollection}">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding NonNumericProperty}"/>
            <local:DataGridNumericColumn Binding="{Binding NumericProperty}"/>
        </DataGrid.Columns>
    </DataGrid>

Hope this helps