1. /两个combox多行联动
2.         private ComboBox cb1 = new ComboBox();
3.         private ComboBox cb2 = new ComboBox();
5.         //设置combox高度，解决默认修改combox.Height属性不能改变高度的问题
6.         [System.Runtime.InteropServices.DllImport("user32.dll")]
7.         private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
8.         private const int CB_SETITEMHEIGHT = 0x153;
9.         private bool SetComboBoxHeight(ComboBox cb, int height)
10.         {
11.             int rtn = SendMessage(cb.Handle, CB_SETITEMHEIGHT, -1, height);
12.             cb.Refresh();
13.             return rtn != -1;
14.         }
16.         public gvForm()
17.         {
18.             InitializeComponent();
19.         }
20.         /// <summary>
21.         /// 不连接数据库，临时创建table
22.         /// </summary>
23.         /// <param name="paramsCols">列名</param>
24.         /// <param name="name">表名</param>
25.         /// <param name="rowCount">行数</param>
26.         /// <returns></returns>
27.         private DataTable CreateDataTable(string[] paramsCols, string name, int rowCount)
28.         {
29.             DataTable table = new DataTable(name);
30.             foreach (string s in paramsCols)
31.                 table.Columns.Add(s, typeof(string));
32.             for (int i = 0; i < rowCount; i++)
33.             {
34.                 DataRow row = table.NewRow();
35.                 foreach (string s in paramsCols)
36.                 {
37.                     row[s] = s + "_" + i;
38.                 }
39.                 table.Rows.Add(row);
40.             }
41.             return table;
42.         }
44.         private void gvForm_Load(object sender, EventArgs e)
45.         {
46.             //创建整个datagridview的datasource
47.             this.dataGridView1.DataSource = CreateDataTable(new[] { "ID", "Name", "CBOne", "CBTwo" }, "Main", 5);
48.             this.cb1.Visible = false;
49.             this.cb2.Visible = false;
50.             //为combox添加selectindex消息响应
51.             this.cb1.SelectedIndexChanged += new EventHandler(cb1_SelectedIndexChanged);
52.             this.cb2.SelectedIndexChanged += new EventHandler(cb1_SelectedIndexChanged);
53.             this.dataGridView1.Controls.Add(this.cb1);
54.             this.dataGridView1.Controls.Add(this.cb2);
55.         }
57.         void cb1_SelectedIndexChanged(object sender, EventArgs e)
58.         {
59.             this.dataGridView1.CurrentCell.Value = ((ComboBox)sender).Text;
60.         }
61.         
62.         /// <summary>
63.         /// 即时设定combox的动态数据源
64.         /// </summary>
65.         /// <param name="sender"></param>
66.         /// <param name="e"></param>
67.         private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
68.         {
69.             if (this.dataGridView1.CurrentCell == null)
70.             { 
71.             }
72.             //第一个combox，根据ID
73.             else if (this.dataGridView1.CurrentCell.ColumnIndex == 2)
74.             {
75.                 this.cb1.Visible = false;
76.                 this.cb2.Visible = false;
77.                 string s = this.dataGridView1.Rows[this.dataGridView1.CurrentCell.RowIndex].Cells[0].Value.ToString() + "_Text";
78.                 
79.                 this.cb1.Items.Clear();
80.                 DataTable cbt1 =  CreateDataTable(new[] { s }, "cb1", 5);
81.                 foreach (DataRow row in cbt1.Rows)
82.                 {
83.                     this.cb1.Items.Add(row[s]);
84.                     
85.                 }
86.                 this.cb1.DropDownStyle = ComboBoxStyle.DropDownList;
87.                 this.cb1.SelectedIndex = 0;
89.                 Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
91.                 this.cb1.Left = rect.Left;
92.                 this.cb1.Top = rect.Top;
93.                 this.cb1.Width = rect.Width;
94.                 //设定高度，这个-6不知什么原因，不过减6后才是正确的值
95.                 this.SetComboBoxHeight(this.cb1, rect.Height - 6);
96.                 this.cb1.Visible = true;
97.             }
98.             //第二个combox，根据第一个combox绑定相应的数据源
99.             else if (this.dataGridView1.CurrentCell.ColumnIndex == 3)
100.             {
101.                 this.cb1.Visible = false;
102.                 this.cb2.Visible = false;
103.                 string s = this.dataGridView1.Rows[this.dataGridView1.CurrentCell.RowIndex].Cells[2].Value.ToString() + "_L_Text";
104.                 this.cb2.Items.Clear();
105.                 DataTable cbt2 = CreateDataTable(new[] { s }, "cb2", 5);
106.                 foreach (DataRow row in cbt2.Rows)
107.                 {
108.                     this.cb2.Items.Add(row[s]);
109.                 }
110.                 this.cb2.DropDownStyle = ComboBoxStyle.DropDownList;
111.                 this.cb2.SelectedIndex = 0;
113.                 Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
115.                 this.cb2.Left = rect.Left;
116.                 this.cb2.Top = rect.Top;
117.                 this.cb2.Width = rect.Width;
118.                 this.SetComboBoxHeight(this.cb2, rect.Height - 6);
119.                 this.cb2.Visible = true;
120.             }
121.             else
122.             {
123.                 this.cb1.Visible = false;
124.                 this.cb2.Visible = false;
125.             }
126.         }
127.         //其他消息响应隐藏combox
128.         private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
129.         {
130.             this.cb1.Visible = false;
131.             this.cb2.Visible = false;
132.         }
133.         //改变列宽也改变combox的宽度
134.         private void dataGridView1_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e)
135.         {
136.             if(e.Column.Name.Equals("CBOne"))
137.             {
138.                 Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
140.                 this.cb1.Left = rect.Left;
141.                 this.cb1.Top = rect.Top;
142.                 this.cb1.Width = rect.Width;
143.                 this.SetComboBoxHeight(this.cb1, rect.Height);
144.             }
145.             else if(e.Column.Name.Equals("CBTwo"))
146.             {
148.                 Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
150.                 this.cb2.Left = rect.Left;
151.                 this.cb2.Top = rect.Top;
152.                 this.cb2.Width = rect.Width;
153.                 this.SetComboBoxHeight(this.cb2, rect.Height - 6);
154.             }
155.         }
156.         //改变行高也改变combox的高度
157.         private void dataGridView1_RowHeightChanged(object sender, DataGridViewRowEventArgs e)
158.         {
159.             if (e.Row.Index == this.dataGridView1.CurrentCell.RowIndex)
160.             {
161.                 Rectangle rect1 = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
163.                 this.cb1.Left = rect1.Left;
164.                 this.cb1.Top = rect1.Top;
165.                 this.cb1.Width = rect1.Width;
166.                 this.SetComboBoxHeight(this.cb1, rect1.Height);
168.                 Rectangle rect2 = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
170.                 this.cb2.Left = rect2.Left;
171.                 this.cb2.Top = rect2.Top;
172.                 this.cb2.Width = rect2.Width;
173.                 this.SetComboBoxHeight(this.cb2, rect2.Height - 6);
174.             }
175.         }
176.     }

DataGirdView绑定多列combox联动