继续发布VS2005下开发ComboBoxDataGridView (下拉列表弹出DataGridView)

前一段时间,我写个两个控件, ComboBoxTreeView(下拉列表框弹出树) 与ToolStripComboBoxTreeView(下拉列表框工具条弹出树) ,不知道对大家在开发的过程中是否有帮助,今天继续发布VS2005下的ComboBox系列控件中的ComboBoxDataGridView (下拉列表弹出DataGridView),思路与ComboBoxTreeView差不多,唯一不同的是,在数据源设置的地方,大家可以看代码,也希望大家能够踊跃留言,把你们的问题说出来,以便我能开发更好的更实用的控件给大家．在以后的几天当中，我将陆续发布VS2005下的一些控件，请大家关注，好了，下面大家请看附图：

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Drawing;
using  System.Data;
using  System.Text;
using  System.Windows.Forms;
using  System.Drawing.Design;

namespace  WindowsApplication21
{
    public class ComboBoxDataGridView : ComboBox
    {
        成员变量#region 成员变量
        private const int WM_LBUTTONDOWN = 0x201, WM_LBUTTONDBLCLK = 0x203;
        ToolStripControlHost dataGridViewHost;
        ToolStripDropDown dropDown;
        private string m_sDefaultColumn;
        private string m_Separator = "|";
        private bool m_blPopupAutoSize = false;
        private DataGridViewRow m_dgvRow;
        public event EventHandler AfterSelector;
        #endregion
        构造函数#region 构造函数
        public ComboBoxDataGridView()
        {

            DrawDataGridView();

        }
        #endregion
        属性#region 属性
        [Description("设置DataGridView属性"), Browsable(true), Category("N8")]
        public DataGridView DataGridView
        {
            get
            {
                return dataGridViewHost.Control as DataGridView;
            }
        }
        [Description("下拉表格尺寸是否为自动"), Browsable(true), Category("N8")]
        public bool PopupGridAutoSize
        {
            set
            {
                m_blPopupAutoSize = value;
            }
        }
        [Description("分割符号"), Browsable(true), Category("N8")]
        public string SeparatorChar
        {
            set
            {
                m_Separator = value;
            }
        }
        [Description("设置默认值"), Browsable(true), Category("N8")]
        public string DefaultColumn
        {
            set
            {
                m_sDefaultColumn = value;
            }
            get
            {
                if (m_sDefaultColumn == null)
                {
                    return String.Empty;
                }
                else
                {
                    return m_sDefaultColumn;
                }
            }
        }
        #endregion
        方法#region 方法
        绘制DataGridView以及下拉DataGridView#region 绘制DataGridView以及下拉DataGridView
        private void DrawDataGridView()
        {
            DataGridView dataGridView = new DataGridView();

            dataGridView.BackgroundColor = SystemColors.ActiveCaptionText;
            dataGridView.BorderStyle = BorderStyle.None;
            dataGridView.ReadOnly = true;
            dataGridView.AllowUserToAddRows = false;
            dataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
            dataGridView.DoubleClick += new EventHandler(dataGridView_DoubleClick);

            //设置DataGridView的数据源
            Form frmDataSource = new Form();
            frmDataSource.Controls.Add(dataGridView);
            frmDataSource.SuspendLayout();

            dataGridViewHost = new ToolStripControlHost(dataGridView);
            dataGridViewHost.AutoSize = m_blPopupAutoSize;

            dropDown = new ToolStripDropDown();
            dropDown.Width = this.Width;
            dropDown.Items.Add(dataGridViewHost);
        }
        #endregion
        public string GetDataProperty(string sColumn)
        {
            string sValue = "";
            if (m_dgvRow != null)
            {
                if (DataGridView.Columns.Contains(sColumn))
                {
                    sValue = m_dgvRow.Cells[sColumn].Value.ToString();
                }
            }
            return sValue;
        }
        public void dataGridView_DoubleClick(object sender, EventArgs e)
        {
            PopupGridView(e);
        }
        /**//// <summary>
        /// 弹出下拉表格并触发选择后事件
        /// </summary>
        /// <param name="e"></param>
        private void PopupGridView(EventArgs e)
        {
            if (DataGridView.SelectedRows.Count > 0)
            {

                m_dgvRow = DataGridView.SelectedRows[0];
                if (m_sDefaultColumn != String.Empty)
                {
                    Text = "";
                    string[] sColumnList = m_sDefaultColumn.Split(',');
                    foreach (string sColumn in sColumnList)
                    {
                        if (DataGridView.Columns.Contains(sColumn))
                        {
                            Text += m_dgvRow.Cells[sColumn].Value.ToString() + m_Separator;
                        }
                    }
                    Text = Text.TrimEnd(m_Separator.ToCharArray());
                }
                else
                {
                    Text = m_dgvRow.Cells[0].Value.ToString();
                }
                if (AfterSelector != null)
                {
                    AfterSelector(this,e);
                }
            }
            dropDown.Close();
        }
      
        private void ShowDropDown()
        {
            if (dropDown != null)
            {
                dataGridViewHost.Size = new Size(DropDownWidth - 2, DropDownHeight);
                dropDown.Show(this, 0, this.Height);
            }
        }
        重写方法#region 重写方法
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_LBUTTONDBLCLK || m.Msg == WM_LBUTTONDOWN)
            {
                ShowDropDown();
                return;
            }
            base.WndProc(ref m);
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (dropDown != null)
                {
                    dropDown.Dispose();
                    dropDown = null;
                }
            }
            base.Dispose(disposing);
        }
        #endregion
        #endregion
    }
}

下面的代码是客户端调用的方法：
在下面的演示程序中
/Files/CodeAnyWhere/ComboBoxDataGridView.rar