How to customize the appearance of the DataGridComboBox in MAUI DataGrid (SfDataGrid)?

This article demonstrates how to customize the appearance of the DataGridComboBox within a .NET MAUI DataGrid.

The .NET MAUI DataGrid (SfDataGrid) provides flexibility in customizing the appearance of the DataGridComboBox at the sample level by overriding the DataGridComboBoxRenderer.

To achieve this customization, follow these steps:

Create a class named CustomDataGridComboBoxRenderer that inherits from DataGridComboBoxRenderer. Inside the CustomDataGridComboBoxRenderer class, set the desired properties for the SfComboBox view within the OnInitializeEditView method. Register the custom DataGridComboBoxRenderer in the SfDataGrid.CellRenderers collection. This involves removing the existing entry with the corresponding key from the collection and adding a new entry with the same key, along with an instance of the custom renderer.

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
            xmlns:local="clr-namespace:MauiApp1"
            xmlns:dataGrid="clr-namespace:Syncfusion.Maui.DataGrid;assembly=Syncfusion.Maui.DataGrid"
            x:Class="MauiApp1.MainPage">

   <ContentPage.BindingContext>
       <local:OrderInfoRepository x:Name="viewModel"/>
   </ContentPage.BindingContext>

   <dataGrid:SfDataGrid x:Name="dataGrid"
                        AutoGenerateColumnsMode="None"
                        ColumnWidthMode="Auto"
                        SelectionMode="Single"
                        AllowEditing="True"
                        ItemsSource="{Binding OrderInfoCollection}">
       <dataGrid:SfDataGrid.Columns>
           <dataGrid:DataGridTextColumn MappingName="OrderID" 
                                        HeaderText="Order ID"/>
           <dataGrid:DataGridTextColumn MappingName="CustomerID" 
                                        HeaderText="Customer ID"/>
           <dataGrid:DataGridComboBoxColumn MappingName="Customer" 
                                            HeaderText="Customer Name"
                                            HeaderTextAlignment="Start"
                                            Width="200"
                                            ItemsSource="{Binding CustomerNames}"/>
           <dataGrid:DataGridTextColumn MappingName="ShipCity" 
                                        HeaderText="Ship City"/>
           <dataGrid:DataGridTextColumn MappingName="ShipCountry" 
                                        HeaderText="Ship Country"/>
           <dataGrid:DataGridTextColumn MappingName="Price" 
                                        HeaderText="Total Price"/>
       </dataGrid:SfDataGrid.Columns>
   </dataGrid:SfDataGrid>
</ContentPage>

using Syncfusion.Maui.DataGrid;
using Syncfusion.Maui.Inputs;

namespace MauiApp1
{
   public partial class MainPage : ContentPage
   {
       public MainPage()
       {
           InitializeComponent();
           dataGrid.CellRenderers.Remove("ComboBox");
           dataGrid.CellRenderers.Add("ComboBox", new CustomDataGridComboBoxRenderer());
       }
   }

   public class CustomDataGridComboBoxRenderer : DataGridComboBoxRenderer
   {
       public override void OnInitializeEditView(DataColumnBase dataColumn, SfComboBox view)
       {
           base.OnInitializeEditView(dataColumn, view);

           view.ClearButtonIconColor = Colors.Red;
           view.DropDownIconColor = Colors.Purple;
           view.TextColor = Colors.DeepPink;
           view.Placeholder = "Select a value";
           view.PlaceholderColor = Colors.DarkMagenta;
           view.TextColor = Colors.DarkViolet;
       }
   }
}