VB.NET 调用方法
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VB.NET Invoke Method
提问by Redder
I have this method in my code:
我的代码中有这个方法：
Private Sub Display()
Received.AppendText(" - " & RXArray)
End Sub
Whats the difference between this 2 calls:
这两个调用之间有什么区别：
Me.Invoke(New MethodInvoker(AddressOf Display))
AND
和
Display()
I know that is something about threading, but I'm not sure.
我知道这与线程有关，但我不确定。
Thanks in advance
提前致谢
回答by jor
Use the Invokeway when you're working in different threads. For example if the caller is not in the same thread as the GUI.
Invoke在不同线程中工作时使用该方式。例如，如果调用者与 GUI 不在同一个线程中。
If the caller doesn't need to wait for the result of the method, you could even use BeginInvoke:
如果调用者不需要等待方法的结果，您甚至可以使用BeginInvoke：
GuiObject.BeginInvoke(New MethodInvoker(AddressOf Display))
Or shorter:
或更短：
GuiObject.BeginInvoke(Sub() Display)
For more ease of writing you could move the invoking into the Displayfunction:
为了更易于编写，您可以将调用移动到Display函数中：
Private Sub Display()
If Me.InvokeRequired Then
Me.Invoke(Sub() Display)
Return
End IF
Received.AppendText(" - " & RXArray)
End Sub
That way the caller doesn't have to know whether he is in the same thread or not.
这样调用者就不必知道他是否在同一个线程中。
回答by Caglayan ALTINCI
Adding parameters to the other answer:
将参数添加到另一个答案：
Private Sub Display(ByVal strParam As String)
If Me.InvokeRequired Then
Me.Invoke(Sub() Display(strParam))
Return
End IF
Received.AppendText(" - " & RXArray)
End Sub
回答by Levis
For future readers, you could also update your UI object by doing the following
对于未来的读者，您还可以通过执行以下操作来更新您的 UI 对象
Private Sub Display()
If Me.InvokeRequired Then
Me.Invoke(Sub() Received.AppendText(" - " & RXArray))
Return
End IF
End Sub
