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Example E2578
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WinForms Data Grid - Add a column that behaves like a radio group

Each data cell has its own inplace editor. A cell can contain radio group items. You can select different items in different cells. Checking a radio item in one cell does not uncheck items in other cells.

This example shows how to make all cells in a column behave like one radio group.

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Example Code

Form1.cs(vb) 
C#
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1 {
    public partial class Form1 : Form {
        private DataTable CreateTable(int RowCount) {
            DataTable tbl = new DataTable();
            tbl.Columns.Add("Name", typeof(string));
            tbl.Columns.Add("ID", typeof(int));
            tbl.Columns.Add("Number", typeof(int));
            tbl.Columns.Add("Date", typeof(DateTime));
            for(int i = 0; i < RowCount; i++)
                tbl.Rows.Add(new object[] { String.Format("Name{0}", i), i, 3 - i, DateTime.Now.AddDays(i) });
            return tbl;
        }

        private GridRadioGroupColumnHelper _Helper;
        public Form1() {
            InitializeComponent();
            gridControl1.DataSource = CreateTable(20);
            _Helper = new GridRadioGroupColumnHelper(gridView1);
            _Helper.SelectedRowChanged += _Helper_SelectedRowChanged;

        }

        void _Helper_SelectedRowChanged(object sender, EventArgs e) {
            Text = _Helper.SelectedDataSourceRowIndex.ToString();
        }
        protected override void OnFormClosing(FormClosingEventArgs e) {
            base.OnFormClosing(e);
            _Helper.SelectedRowChanged -= _Helper_SelectedRowChanged;
            _Helper.Disable();
            _Helper = null;
        }
    }
}
Helper/GridRadioGroupColumnHelper.cs(vb) 
C#
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraGrid.Columns;
using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraEditors;

namespace WindowsApplication1
{
    public class GridRadioGroupColumnHelper
    {

        public event EventHandler SelectedRowChanged;
        private GridView _GridView;

        private RepositoryItemCheckEdit _RepositoryItem = new RepositoryItemCheckEdit();
        public RepositoryItemCheckEdit RadioRepositoryItem
        {
            get { return _RepositoryItem; }
            set { _RepositoryItem = value; }
        }

        private GridColumn _RadioGroupColumn = new GridColumn();
        public GridColumn RadioGroupColumn
        {
            get { return _RadioGroupColumn; }
            set { _RadioGroupColumn = value; }
        }


        private int _SelectedDataSourceRowIndex;
        public int SelectedDataSourceRowIndex
        {
            get { return _SelectedDataSourceRowIndex; }
            set
            {
                if (_SelectedDataSourceRowIndex != value)
                {
                    int oldRowIndex = _SelectedDataSourceRowIndex;
                    _SelectedDataSourceRowIndex = value;
                    SetRowChecked(oldRowIndex, false);
                    OnSelectedRowChanged(oldRowIndex, value);
                }
            }
        }

        private void SetRowChecked(int dataSourceRowIndex, bool value)
        {
            int rowHandle = _GridView.GetRowHandle(dataSourceRowIndex);
            _GridView.SetRowCellValue(rowHandle, RadioGroupColumn, value);
        }
        public GridRadioGroupColumnHelper(GridView gridView)
        {
            _GridView = gridView;
            _GridView.BeginUpdate();
            InitGridView();
            InitColumn();
            InitRepositoryItem();
            _GridView.EndUpdate();
        }
        private void InitGridView()
        {
            _GridView.CustomUnboundColumnData += _GridView_CustomUnboundColumnData;
        }

        void _GridView_CustomUnboundColumnData(object sender, CustomColumnDataEventArgs e)
        {
            if (e.Column == RadioGroupColumn)
            {
                if (e.IsGetData)
                    e.Value = e.ListSourceRowIndex == SelectedDataSourceRowIndex;
                if (e.IsSetData)
                    if (e.Value.Equals(true))
                        SelectedDataSourceRowIndex = e.ListSourceRowIndex;
            }
        }
        private void InitColumn()
        {
            RadioGroupColumn.FieldName = "RadioGroupColumn";
            _GridView.Columns.Add(RadioGroupColumn);
            RadioGroupColumn.Visible = true;
            RadioGroupColumn.ColumnEdit = RadioRepositoryItem;
            RadioGroupColumn.Caption = "Radio";
            RadioGroupColumn.UnboundType = DevExpress.Data.UnboundColumnType.Boolean;
            RadioGroupColumn.MaxWidth = 50;
        }
        private void InitRepositoryItem()
        {
            RadioRepositoryItem.CheckStyle = DevExpress.XtraEditors.Controls.CheckStyles.Radio;
            RadioRepositoryItem.EditValueChanged += RadioRepositoryItem_EditValueChanged;
            _GridView.GridControl.RepositoryItems.Add(RadioRepositoryItem);
        }


        void RadioRepositoryItem_EditValueChanged(object sender, EventArgs e)
        {
            _GridView.PostEditor();
        }

        private void OnSelectedRowChanged(int oldValue, int newValue)
        {
            RaiseSelectedRowChanged();
        }
        protected virtual void RaiseSelectedRowChanged()
        {
            if (SelectedRowChanged != null)
                SelectedRowChanged(_GridView, EventArgs.Empty);
        }
        public void Disable() {
            RadioRepositoryItem.EditValueChanged -= RadioRepositoryItem_EditValueChanged;
            _GridView.CustomUnboundColumnData -= _GridView_CustomUnboundColumnData;
            _GridView = null;
            RadioRepositoryItem = null;
        }
    }
}

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