DataGridView中的列类型设置为Combo，模式为可以选择&可以输入，解决方法。

 1 private void DgvLayerPringSetting_EditingControlShowing(object sender,DataGridViewEditingControlShowingEventArgs e)
 2         {
 3             var cb = e.Control as ComboBox;
 4             
 5             if (cb != null)
 6             {
 7                 cb.MaxLength = 2;
 8                 cb.DropDownStyle = ComboBoxStyle.DropDown;
 9                 cb.AutoCompleteMode = AutoCompleteMode.Suggest;
10                 cb.AutoCompleteSource = AutoCompleteSource.ListItems;
11             }
12         }
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原文地址：https://www.cnblogs.com/yume2015/p/3477940.html