委托中的多个杂项 [英] Multiple variales in delegate

问题描述

我一直在尝试找出如何向我的"委托中添加另一个变量
作为我的回调函数-但是经过数小时的网上搜索后，我仍然无法理解它是如何完成的:-(

所以这是我的问题:
如何扩展下面的代码以添加另一个变量(我可以在没有任何问题的委托语句[public proxy sub SetText ...]中做到这一点，但是当我创建它时，我无法将其传递给委托[Dim d as new SetText ...] ???)

感谢您的任何投入:)

I''ve been trying to figure out how to add another variable to "my" delegate
for my callback function - but after hours of searching the net I have not been able to understand how it''s done :-(

So here is my question:
How to I expand the code below to add another variable (I can do that In the delegate statement [public delegate sub SetText...]without problems but then i can not pass it to the delegate when I create it[Dim d as new SetText...] ???)

Thanks for any inputs :)

Delegate Sub SetTextCallback(ByVal [text] As String)



   Public Sub SetPRGMessageText(ByVal [text] As String)
       ' InvokeRequired required compares the thread ID
       ' If the creator thread of the control is different then the caller Thread
       ' this Sub will be called by cretor thread of the control
       If MenuStrip_Main.InvokeRequired Then
           Dim d As New SetTextCallback(AddressOf SetPRGMessageText) ' this is the call back to [SetPRGMessageText]using the creator
           Me.Invoke(d, New Object() {[text]})
       Else
           Me.ToolStripTxB_Message.Text = [text]
       End If
   End Sub

推荐答案

在将附加参数添加到签名后，应该将附加参数传递给调用.

所以，这个:

You should just be passing the additional parameter into the invoke after you''re done adding it to your signature.

So, this:

Me.Invoke(d, New Object() {[text]})

成为:

Becomes:

Me.Invoke(d, New Object() {[text], [text2]})

这样的事情.

--------

更新:

这是一个有效的代码段，无论哪种语法，您都可以调用invoke ...

Something like that.

--------

Update:

Here''s a snippet that would work, with either syntax you can call invoke...

Public Class Form1

    Delegate Sub SetTextCallback(ByVal A As String, ByVal B As String)

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim d As New SetTextCallback(AddressOf Method)

        Invoke(d, "A", "B")
        Invoke(d, New Object() {"One", "Two"})
    End Sub

    Private Sub Method(ByVal A As String, ByVal B As String)
        Trace.Write(String.Format("{0} {1}", A, B))
    End Sub
End Class

这篇关于委托中的多个杂项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！