combol赋值空字符串
我在程序中用到了控件combol,我在程序中有两个combol,当两个选择的项相同时,会弹出错误对话框,我想把一个combol选择的项赋值空字符串,重现选择,可是我试验了,用combol.text=""不行,那位师傅做过此类有关项目,希望有经验的能给指点 --------------------编程问答-------------------- 首先你要允许输入,而不是只能挑选下拉内容其次combol.text=" ",加个空格 --------------------编程问答-------------------- 为什么当两个选择的项相同时,会弹出错误对话框??? --------------------编程问答-------------------- ComboBox1.SelectedIndex = -1 --------------------编程问答-------------------- 也可以
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ComboBox1.Items.Clear()
ComboBox1.Items.Add("A")
ComboBox1.Items.Add("B")
ComboBox1.Items.Add("")
ComboBox1.SelectedIndex = 0
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
ComboBox1.SelectedIndex = 2
End Sub --------------------编程问答-------------------- 楼上都有说。。 --------------------编程问答--------------------
++ --------------------编程问答-------------------- 鄙视发帖不结贴的家伙,拒绝回答你问题了 --------------------编程问答--------------------
--------------------编程问答-------------------- select case combox1.text
case "A"
combox2.items.clear
combox2.text=" "
combox2.items.add("B")
combox2.items.add("C")
case "B"
combox2.items.clear
combox2.text=" "
combox2.items.add("A")
combox2.items.add("C")
case "C"
combox2.items.clear
combox2.text=" "
combox2.items.add("A")
combox2.items.add("B")
end slect
补充:.NET技术 , VB.NET