在窗体加载时在DataGridView中插入一次DataGridViewComboBoxColumn

问题描述

我在下面有此代码

I have this code below

cmb.HeaderText = "Promoted To"
cmb.Name = "cmb"
cmb.MaxDropDownItems = 4
cmb.items.add("Class 2")   
cmb.items.add("Class 3")
DataGridView.Columns.Insert(4, cmb)

此代码处于表单加载状态，每次我加载表单时，都会将DataGridViewComboBoxColumn插入位置4.但是我希望将DataGridViewComboBoxColumn插入一次，如果已经退出，则不应再次插入.

this code is at form load and each time i load the form, the DataGridViewComboBoxColumn is inserted at position 4.but i want the DataGridViewComboBoxColumn to be inserted once and if it already exit it should not be inserted again.

推荐答案

cmb.HeaderText = "Promoted To"
cmb.Name = "cmb"
cmb.MaxDropDownItems = 4
cmb.items.add("Class 2")
cmb.items.add("Class 3")
DataGridView.Columns.Insert(4, cmb)

如果

End If

If DataGridView.Columns.Count < 8 Then
                   Dim cmb As New DataGridViewComboBoxColumn()
                   cmb.HeaderText = "Promoted To"
                   cmb.Name = "cmb"
                   cmb.MaxDropDownItems = 4
                   DataGridView.Columns.Insert(4, cmb)
               End If

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