Question

C# winform datagridview 里的下拉框中 既可以从下拉框里选择数据，也可以让客户自己手动往里输入数据，怎

Answer 1

DataGridViewComboBoxColumn cmbox = dataGridView1.Columns["绑定列"] as DataGridViewComboBoxColumn;
cmbox.DataSource = ds.Tables[0];
cmbox.DisplayMember = "ctype";
cmbox.ValueMember = "ctype";
cmbox.DataPropertyName = "ctype";
comboBox1.DataSource = CommonSerivce.GetDataSetByColomnName("Customer_Info", "clevel");

或者采用以下方法：
((DataGridViewComboBoxColumn)dataGridView1.Columns["绑定列"]).DataSource = ds;
((DataGridViewComboBoxColumn)dataGridView1.Columns["绑定列"]).DisplayMember = "clevel";
((DataGridViewComboBoxColumn)dataGridView1.Columns["绑定列"]).ValueMember = "clevel";
((DataGridViewComboBoxColumn)dataGridView1.Columns["绑定列"]).DataPropertyName = "company";

Answer 2

这很简单，自定义列，列的类型选择Combobox就行了
定义列在DataGridView属性中进行

Answer 3

楼上正解