DataGirdView绑定多列combox联动

/两个combox多行联动
private ComboBox cb1 = new ComboBox();
private ComboBox cb2 = new ComboBox();
//设置combox高度，解决默认修改combox.Height属性不能改变高度的问题
[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
private const int CB_SETITEMHEIGHT = 0x153;
private bool SetComboBoxHeight(ComboBox cb, int height)
{
int rtn = SendMessage(cb.Handle, CB_SETITEMHEIGHT, -1, height);
cb.Refresh();
return rtn != -1;
}
public gvForm()
{
InitializeComponent();
}
/// <summary>
/// 不连接数据库，临时创建table
/// </summary>
/// <param name="paramsCols">列名</param>
/// <param name="name">表名</param>
/// <param name="rowCount">行数</param>
/// <returns></returns>
private DataTable CreateDataTable(string[] paramsCols, string name, int rowCount)
{
DataTable table = new DataTable(name);
foreach (string s in paramsCols)
table.Columns.Add(s, typeof(string));
for (int i = 0; i < rowCount; i++)
{
DataRow row = table.NewRow();
foreach (string s in paramsCols)
{
row[s] = s + "_" + i;
}
table.Rows.Add(row);
}
return table;
}
private void gvForm_Load(object sender, EventArgs e)
{
//创建整个datagridview的datasource
this.dataGridView1.DataSource = CreateDataTable(new[] { "ID", "Name", "CBOne", "CBTwo" }, "Main", 5);
this.cb1.Visible = false;
this.cb2.Visible = false;
//为combox添加selectindex消息响应
this.cb1.SelectedIndexChanged += new EventHandler(cb1_SelectedIndexChanged);
this.cb2.SelectedIndexChanged += new EventHandler(cb1_SelectedIndexChanged);
this.dataGridView1.Controls.Add(this.cb1);
this.dataGridView1.Controls.Add(this.cb2);
}
void cb1_SelectedIndexChanged(object sender, EventArgs e)
{
this.dataGridView1.CurrentCell.Value = ((ComboBox)sender).Text;
}
/// <summary>
/// 即时设定combox的动态数据源
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
{
if (this.dataGridView1.CurrentCell == null)
{
}
//第一个combox，根据ID
else if (this.dataGridView1.CurrentCell.ColumnIndex == 2)
{
this.cb1.Visible = false;
this.cb2.Visible = false;
string s = this.dataGridView1.Rows[this.dataGridView1.CurrentCell.RowIndex].Cells[0].Value.ToString() + "_Text";
this.cb1.Items.Clear();
DataTable cbt1 = CreateDataTable(new[] { s }, "cb1", 5);
foreach (DataRow row in cbt1.Rows)
{
this.cb1.Items.Add(row[s]);
}
this.cb1.DropDownStyle = ComboBoxStyle.DropDownList;
this.cb1.SelectedIndex = 0;
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb1.Left = rect.Left;
this.cb1.Top = rect.Top;
this.cb1.Width = rect.Width;
//设定高度，这个-6不知什么原因，不过减6后才是正确的值
this.SetComboBoxHeight(this.cb1, rect.Height - 6);
this.cb1.Visible = true;
}
//第二个combox，根据第一个combox绑定相应的数据源
else if (this.dataGridView1.CurrentCell.ColumnIndex == 3)
{
this.cb1.Visible = false;
this.cb2.Visible = false;
string s = this.dataGridView1.Rows[this.dataGridView1.CurrentCell.RowIndex].Cells[2].Value.ToString() + "_L_Text";
this.cb2.Items.Clear();
DataTable cbt2 = CreateDataTable(new[] { s }, "cb2", 5);
foreach (DataRow row in cbt2.Rows)
{
this.cb2.Items.Add(row[s]);
}
this.cb2.DropDownStyle = ComboBoxStyle.DropDownList;
this.cb2.SelectedIndex = 0;
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb2.Left = rect.Left;
this.cb2.Top = rect.Top;
this.cb2.Width = rect.Width;
this.SetComboBoxHeight(this.cb2, rect.Height - 6);
this.cb2.Visible = true;
}
else
{
this.cb1.Visible = false;
this.cb2.Visible = false;
}
}
//其他消息响应隐藏combox
private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
this.cb1.Visible = false;
this.cb2.Visible = false;
}
//改变列宽也改变combox的宽度
private void dataGridView1_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e)
{
if(e.Column.Name.Equals("CBOne"))
{
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb1.Left = rect.Left;
this.cb1.Top = rect.Top;
this.cb1.Width = rect.Width;
this.SetComboBoxHeight(this.cb1, rect.Height);
}
else if(e.Column.Name.Equals("CBTwo"))
{
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb2.Left = rect.Left;
this.cb2.Top = rect.Top;
this.cb2.Width = rect.Width;
this.SetComboBoxHeight(this.cb2, rect.Height - 6);
}
}
//改变行高也改变combox的高度
private void dataGridView1_RowHeightChanged(object sender, DataGridViewRowEventArgs e)
{
if (e.Row.Index == this.dataGridView1.CurrentCell.RowIndex)
{
Rectangle rect1 = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb1.Left = rect1.Left;
this.cb1.Top = rect1.Top;
this.cb1.Width = rect1.Width;
this.SetComboBoxHeight(this.cb1, rect1.Height);
Rectangle rect2 = this.dataGridView1.GetCellDisplayRectangle(this.dataGridView1.CurrentCell.ColumnIndex, this.dataGridView1.CurrentCell.RowIndex, true);
this.cb2.Left = rect2.Left;
this.cb2.Top = rect2.Top;
this.cb2.Width = rect2.Width;
this.SetComboBoxHeight(this.cb2, rect2.Height - 6);
}
}
}

时间： 2024-08-25 15:33:44

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