Question

我想在var.NET更改时在VB.NET中做一个If。例如：

If var testvar change do this if Then
            Me.RichTextBox1.Text = "Hello World"
        End If

Answer 1

您要做的是创建一个Class来包装您的变量，以及一个在变量发生变化时引发的事件。例如，您的监听器（Form）订阅该事件并对其做出响应。

Imports System
Class MyClass
  Private x As Integer
  Public Sub SetX(ByVal i As Integer)
    x = i
  End Sub

  Public Function GetX() As Integer
    Return x
  End Function

  Public Event Changed(ByVal sender As Object, ByVal e As EventArgs)

  Protected Overridable Sub OnChanged(ByVal e As EventArgs)
    RaiseEvent Changed(Me, e)
  End Sub
End Class

有关详细信息，请参阅此处。

http://www.codeproject.com/Articles/5041/Step-by-Step-Event-handling-in-VB-NET http://msdn.microsoft.com/en-us/library/ms172877(v=vs.80).aspx

当Var改变时做IF

1 个答案: