public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
DataGridViewComboBoxExEditingControl clt = DataGridView.EditingControl as DataGridViewComboBoxExEditingControl;
DataGridViewComboBoxExColumn col = (DataGridViewComboBoxExColumn)OwningColumn;
clt.Items.Clear();
clt.Items.AddRange(col.DataSource);//不能用DataSource，因为绑定数据之后就不行对Items执行clear和add事件；另外，绑定数据后会默认选择第一行，如果需要输入多个字符，这样会产生全选，覆盖的输入效果。
clt.AutoCompleteMode = AutoCompleteMode.Suggest;
//clt.FormattingEnabled = true;
clt.Text = Convert.ToString(this.Value);
}
public Form1()
{
InitializeComponent();
//TreeViewColumn cl1 = new TreeViewColumn();
//cl1.HeaderText = "树";
//dataGridView1.Columns.Add(cl1);
//DataGridViewComboBoxExColumn cl2 = new DataGridViewComboBoxExColumn();
//cl2.HeaderText = "下拉框";
//dataGridView1.Columns.Add(cl2);
DataTable table = new DataTable();
table.Columns.Add("AAA", typeof(DateTime));
table.Columns.Add("BBB", typeof(Decimal));
table.Columns.Add("CCC", typeof(String));
string[] tb2 = { "北京", "南京", "111" };
DataGridViewComboBoxExColumn col3 = new DataGridViewComboBoxExColumn();
col3.DataSource = tb2;
col3.Width = 200;
dataGridView1.Columns.Add(col3);
for (int i = 0; i < 3; i++)
{
DataRow row = table.NewRow();
row["AAA"] = DateTime.Now;
row["BBB"] = 123456789.1234567;
row["CCC"] = 2;
table.Rows.Add(row);
}
table.AcceptChanges();
CalendarColumn col4 = new CalendarColumn();
dataGridView1.Columns.Add(col4);
this.dataGridView1.AutoGenerateColumns = false;
this.dataGridView1.DataSource = table;
}
