using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace DataGridViewDownComboBoxDemo

{

    public partial class Form1 : Form

    {

        //级联的列

        DataGridViewComboBoxColumn columns3 = null;

        public Form1()

        {

            InitializeComponent();

            this.dataGridView1.DataError += delegate (object sender, DataGridViewDataErrorEventArgs e) { };

        }

        /// <summary>

        /// 绑定GRIDVIEW

        /// </summary>

        public void GetData()

        {

            //第二列

            DataGridViewComboBoxColumn columns2 = new DataGridViewComboBoxColumn();

            columns2.Name = "col2";

            columns2.DataPropertyName = "Type"; //从数据源绑定列，这一列就是那个值

            columns2.HeaderText = "货区";

            string[] strTmp = new string[] { "货区A", "货区B", "货区C" , "货区D", "货区E", "货区F" };

            DgvCombobox(ref columns2, strTmp);//此方法是定义的关键

            //第三列

            columns3 = new DataGridViewComboBoxColumn();

            columns3.Name = "col3";

            columns3.HeaderText = "货架";

            //生成gridview数据源

            DataTable dt = new DataTable();

            dt.Columns.Add(new DataColumn("序号"));

            dt.Columns.Add(new DataColumn("物资名称"));

            dt.Columns.Add(new DataColumn("物资编号"));

            for (int i = ; i < ; i++)

            {

                DataRow dr = dt.NewRow();

                dr[] = i+;

                dr[] = "戴尔笔记本";

                dr[] = ""+(i+).ToString();

                dt.Rows.Add(dr);

            }

            this.dataGridView1.DataSource = dt;

            //gridview添加列

            dataGridView1.Columns.AddRange(new DataGridViewColumn[] { columns2, columns3 });

        }

        /// <summary>

        /// 绑定第二列

        /// </summary>

        /// <param name="column"></param>

        /// <param name="strTmp"></param>

        public void DgvCombobox(ref DataGridViewComboBoxColumn column, string[] strTmp)

        {

            DataTable dt = new DataTable();

            DataColumn dc = new DataColumn("tmp", typeof(string));

            dt.Columns.Add(dc);

            dt.Columns.Add(new DataColumn("ID", typeof(string)));

            DataRow dr;

            for (int i = ; i < strTmp.Length; i++)

            {

                dr = dt.NewRow();

                dr["tmp"] = strTmp[i];

                dr["id"] = i;

                dt.Rows.Add(dr);

            }

            //为combobox绑定生成的表

            column.DataSource = dt; //combobox列的数据源，绑定为生成的表

            column.DisplayMember = "tmp";//要显示的名称，表的文字例

            column.ValueMember = dt.Columns[].ToString();//文字对应的值，此列将和columns2.DataPropertyName 属性的值对应来显示选中的值  

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            this.GetData();

        }

        //添加委托事件

        private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)

        {

            if (this.dataGridView1.CurrentCell.OwningColumn.Name == "col2")

            {

                ((ComboBox)e.Control).SelectedIndexChanged +=

                                    new EventHandler(ComboBox_SelectedIndexChanged);

            }

        }

        private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)

        {

            if (this.dataGridView1.CurrentCell.OwningColumn.Name == "col2")

            { 

                string str = ((ComboBox)sender).Text.ToString();

                //绑定第二个COMBOX

                DataTable dt = new DataTable();

                dt.Columns.Add(new DataColumn("id"));

                dt.Columns.Add(new DataColumn("text"));

                for (int i = ; i < ; i++)

                {

                    DataRow dr = dt.NewRow();

                    dr[] = str + i;

                    dr[] = str + i;

                    dt.Rows.Add(dr);

                }

                ((DataGridViewComboBoxCell)this.dataGridView1.CurrentRow.Cells[]).DataSource = dt;

                ((DataGridViewComboBoxCell)this.dataGridView1.CurrentRow.Cells[]).DisplayMember = "text";

                ((DataGridViewComboBoxCell)this.dataGridView1.CurrentRow.Cells[]).ValueMember = "id";

                ((ComboBox)sender).SelectedIndexChanged -= new EventHandler(ComboBox_SelectedIndexChanged);

            }

        }

    }

}