下拉datagridview:ComboBoxDataGridView

引自：梦在脚下，让心灵去飞翔
http://www.cnblogs.com/CodeAnyWhere/archive/2005/12/13/296461.html

项目需要，稍微修改了ComboBoxDataGridView


代码如下：

  1using System;
  2using System.Collections.Generic;
  3using System.ComponentModel;
  4using System.Drawing;
  5using System.Data;
  6using System.Text;
  7using System.Windows.Forms;
  8using System.Drawing.Design;
  9
 10namespace WindowsApplication21
 11{
 12    public class ComboBoxDataGridView : ComboBox
 13    {
 14        成员变量#region 成员变量
 15        private const int WM_LBUTTONDOWN = 0x201, WM_LBUTTONDBLCLK = 0x203;
 16        ToolStripControlHost dataGridViewHost;
 17        ToolStripDropDown dropDown;
 18        private string m_sDefaultColumn;
 19        private bool m_blPopupAutoSize = false;
 20        private DataGridViewRow m_dgvRow;
 21        public event EventHandler AfterSelector;
 22        /**/////声明一个委托
 23        public delegate void ComboBoxDataGridViewScroll(object sender, bool vscroll);
 24        public event ComboBoxDataGridViewScroll OnScroll;
 25        private const int WM_HSCROLL = 0x114;
 26        private const int WM_VSCROLL = 0x115;
 27
 28        #endregion
 29
 30        构造函数#region 构造函数
 31        public ComboBoxDataGridView()
 32        {
 33
 34            DrawDataGridView();
 35            this.OnScroll += new ComboBoxDataGridViewScroll(ComboBoxDataGridView_OnScroll);
 36        }
 37
 38        public void ComboBoxDataGridView_OnScroll(object sender, bool vscroll)
 39        {
 40            this.dataGridViewHost.Focus();
 41        }
 42        #endregion
 43
 44        属性#region 属性
 45        [Description("设置DataGridView属性"), Browsable(true), Category("N8")]
 46        public DataGridView DataGridView
 47        {
 48            get
 49            {
 50                return dataGridViewHost.Control as DataGridView;
 51            }
 52        }
 53        [Description("下拉表格尺寸是否为自动"), Browsable(true), Category("N8")]
 54        public bool PopupGridAutoSize
 55        {
 56            set
 57            {
 58                m_blPopupAutoSize = value;
 59            }
 60        }
 61  
 62        [Description("设置默认值"), Browsable(true), Category("N8")]
 63        public string DefaultColumn
 64        {
 65            set
 66            {
 67                m_sDefaultColumn = value;
 68            }
 69            get
 70            {
 71                if (m_sDefaultColumn == null)
 72                {
 73                    return String.Empty;
 74                }
 75                else
 76                {
 77                    return m_sDefaultColumn;
 78                }
 79            }
 80        }
 81        #endregion
 82
 83        实现方法#region 实现方法
 84        绘制DataGridView以及下拉DataGridView#region 绘制DataGridView以及下拉DataGridView
 85        private void DrawDataGridView()
 86        {
 87            DataGridView dataGridView = new DataGridView();
 88            dataGridView.RowHeadersVisible = false;
 89            dataGridView.RowTemplate.Resizable = DataGridViewTriState.False; //固定行高不允许调节
 90            dataGridView.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
 91            dataGridView.BackgroundColor = SystemColors.ActiveCaptionText;
 92            dataGridView.BorderStyle = BorderStyle.None;
 93            dataGridView.ReadOnly = true;
 94            dataGridView.AllowUserToAddRows = false;
 95            dataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
 96            dataGridView.Click += new EventHandler(dataGridView_Click);
 97            
 98            //设置DataGridView的数据源
 99            Form frmDataSource = new Form();
100            frmDataSource.Controls.Add(dataGridView);
101            frmDataSource.SuspendLayout();
102
103            dataGridViewHost = new ToolStripControlHost(dataGridView);
104            dataGridViewHost.AutoSize = m_blPopupAutoSize;
105
106            dropDown = new ToolStripDropDown();
107            dropDown.Width = this.Width;
108            dropDown.Items.Add(dataGridViewHost);
109        }
110
111        public void dataGridView_Click(object sender, EventArgs e)
112        {
113            PopupGridView(e);
114        }
115
116        public string GetDataProperty(string sColumn) //
117        {
118            string sValue = "";
119            if (m_dgvRow != null)
120            {
121                if (DataGridView.Columns.Contains(sColumn))
122                {
123                    sValue = m_dgvRow.Cells[sColumn].Value.ToString();
124                }
125            }
126            return sValue;
127        }
128        public void dataGridView_DoubleClick(object sender, EventArgs e)
129        {
130            PopupGridView(e);
131        }
132
133        PopupGridView#region PopupGridView
134        /**//// <summary>
135        /// 弹出下拉表格并触发选择后事件
136        /// </summary>
137        /// <param name="e"></param>
138        private void PopupGridView(EventArgs e)
139        {
140            if (DataGridView.SelectedRows.Count > 0)
141            {
142                m_dgvRow = DataGridView.SelectedRows[0];
143                if (m_sDefaultColumn != String.Empty)
144                {
145                    string[] sColumnList = m_sDefaultColumn.Split(',');
146                    foreach (string sColumn in sColumnList)
147                    {
148                        if (DataGridView.Columns.Contains(sColumn))
149                        {
150                            Items.Clear();
151                            Items.Add(m_dgvRow.Cells[sColumn].Value.ToString());
152                            SelectedIndex = 0;
153                        }
154                    }
155                }
156
157                if (AfterSelector != null)
158                {
159                    AfterSelector(this, e);
160                }
161            }
162            dropDown.Close();
163        }
164        #endregion       
165      
166        private void ShowDropDown()
167        {
168            if (dropDown != null)
169            {
170                dataGridViewHost.Size = new Size(DropDownWidth - 2, DropDownHeight);
171                dropDown.Show(this, 0, this.Height);
172            }
173        }
174
175        重写方法#region 重写方法
176        protected override void WndProc(ref Message m)
177        {
178            if (m.Msg == WM_LBUTTONDBLCLK || m.Msg == WM_LBUTTONDOWN || m.Msg == 0x114 || m.Msg == 0x115)
179            {
180                ShowDropDown();
181                if (OnScroll != null)
182                {
183                    OnScroll(this, m.Msg == 0x115);
184                }
185                return;
186            }
187            base.WndProc(ref m);
188        }
189        protected override void Dispose(bool disposing)
190        {
191            if (disposing)
192            {
193                if (dropDown != null)
194                {
195                    dropDown.Dispose();
196                    dropDown = null;
197                }
198            }
199            base.Dispose(disposing);
200        }
201        #endregion
202        #endregion
203        #endregion
204    }
205}

客户端调用代码：

 1using System;
 2using System.Collections.Generic;
 3using System.ComponentModel;
 4using System.Data;
 5using System.Data.SqlClient;
 6using System.Drawing;
 7using System.Text;
 8using System.Windows.Forms;
 9
10namespace WindowsApplication21
11{
12    public partial class Form2 : Form
13    {
14        DataTable dt = new DataTable();
15        public Form2() //构造函数
16        {
17            InitializeComponent();
18            cmbdgv.DropDownWidth = 400;
19            cmbdgv.DropDownHeight = 200;
20            using (SqlConnection sqlconn = new SqlConnection("server=.;uid=sa;pwd=;database=smls"))
21            {
22                SqlDataAdapter sqlda = new SqlDataAdapter("select std_sg_code,std_text,sg_text,update_user_id from qp_standard_steel_grade", sqlconn);
23                sqlda.Fill(dt);
24            }
25            cmbdgv.DataGridView.DataSource = dt;
26            cmbdgv.DefaultColumn = "std_text"; //默认列
27            cmbdgv.AfterSelector += new EventHandler(cmbdgvAREA_NAME_AfterSelector);
28            for (int i = 0; i < cmbdgv.DataGridView.Columns.Count; i++)
29            {
30                cmbdgv.DataGridView.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
31            }
32        }
33
34        public void cmbdgv_AfterSelector(object sender, EventArgs e)
35        {
36            this.textBox1.Text = cmbdgv.GetDataProperty("std_sg_code"); //获得当前行某单元格的值
37            this.textBox2.Text = cmbdgv.GetDataProperty("sg_text");
38            this.textBox3.Text = cmbdgv.GetDataProperty("update_user_id");
39
40        }
41    }
42}