Changing Column Type to DataGridComboBoxColumn in DataGrid with AutoGenerateColumns

Environment

Control	Author
DataGrid for MAUI	Dobrinka Yordanova

Description

When using the RadDataGrid with AutoGenerateColumns set to True, you may need to customize specific columns during the auto-generation process. Specifically, changing a column to a DataGridComboBoxColumn type based on the property it is bound to. This article demonstrates how to achieve this customization by using the DataGridCommandId.GenerateColumn command.

This knowledge base article also answers the following questions:

• How do I customize column types in auto-generated columns in RadDataGrid?
• Can I change a specific column to a ComboBox column in RadDataGrid?
• How to bind a DataGridComboBoxColumn to a list in RadDataGrid?

Solution

To customize a column's type during the auto-generation process in the RadDataGrid, implement a custom command by inheriting from DataGridCommand. Override the Execute method to specify the custom logic for generating a DataGridComboBoxColumn.

Here's how to implement and apply the custom generate column command:

1. Define the custom generate column command:

public class CustomGenerateColumnCommand : DataGridCommand
{
    public CustomGenerateColumnCommand()
    {
        this.Id = DataGridCommandId.GenerateColumn;
    }

    public override void Execute(object parameter)
    {
        var context = parameter as GenerateColumnContext;

        if (context.PropertyName == "Model")
        {
            // Customize and return the column here.
            context.Result = new DataGridComboBoxColumn
            {
                PropertyName = context.PropertyName,
                HeaderText = context.PropertyName,
                ItemDisplayBindingPath = "Name",
                ItemsSource = (this.BindingContext as ViewModel).Championships,
                Width = 100,
            };
        }
        else
        {
            // Execute the default command for other properties.
            this.Owner.CommandService.ExecuteDefaultCommand(DataGridCommandId.GenerateColumn, parameter);
        }
    }
}

1. Add the custom command to the RadDataGrid commands collection in your XAML:

<telerik:RadDataGrid x:Name="dataGrid" AutoGenerateColumns="True">
    <telerik:RadDataGrid.Commands>
        <local:CustomGenerateColumnCommand />
    </telerik:RadDataGrid.Commands>
</telerik:RadDataGrid>

Ensure the ItemsSource for the DataGridComboBoxColumn is correctly bound to your data source, such as a List of enum models.

See Also

• DataGrid Overview
• DataGrid Columns
• Commanding Overview