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先断开绑定数据,然后重新读入数据就可以 例如: imports system.data imports system.data.oledb private sub duan() textbox1.databindings.clear() datagridview1.datasource=nothing combobox1.datasource=nothing end sub private sub jie() dim myconnection as new olednconnection(...) .... end sub 在需要地方条用duan()和jie()
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你可以直接写Public Sub New(ByVal name As String, ByVal price As Double,byval haskdisk as boolean)
,但在写这句之前要先引用父类的构造函数, 就是加上一句怕你不明白,完整的写法就是这样:
mybase(name , price);
Public Sub New(ByVal name As String, ByVal price As Double,byval haskdisk as boolean) ;
这样就行了,希望我的回答可以帮助你!
怎么会捏,你是不是没有加上mybase.keypress
正确的重写步骤:新建一个Component-类下面一行写上Inherits
TextBox-然后写入:
Protected
Overrides
Sub
OnKeyPress(ByVal
e
As
System.Windows.Forms.KeyPressEventArgs)
MyBase.OnKeyPress(e)'这个东东是原来的keypress执行的代码,它会引发keypress事件
'-----这里写代码
End
Sub
Public Class Form1
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim a As New month(1)
MessageBox.Show(a.ToString)
End Sub
End Class
Public Class month
Dim m As Integer
Public Sub New(i As Integer)
m = i
End Sub
Public Overrides Function ToString() As String
If m = 1 And m = 12 Then
Return Choose(m, "一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二") + "月"
Else
Return m.ToString
End If
End Function
End Class