小错误(线程) [英] A small error(thread)

问题描述

我不断收到以下错误:
"委托''system.windows.forms.methodinvoker"
需要"AddressOf"表达式或
lambda表达式是其构造函数的唯一参数."

请帮帮我.
-----------我的代码------------------

I keep getting the following error:
""Delegate ''system.windows.forms.methodinvoker''
requires an ''AddressOf''expression or
lambda expression as the only argument to its constructor.""

Please Help Me.
-----------my code------------------

Public Sub search()
        Try

            cmdoledb.CommandText = "SELECT NAME FROM table1 WHERE ID=" & CInt(txtid.Text)
            cmdoledb.CommandType = CommandType.Text
            cmdoledb.Connection = cnnoledb
            Dim rdroledb As OleDbDataReader = cmdoledb.ExecuteReader
            While rdroledb.Read = True
                updatetext(rdroledb.Item(0).ToString)
                Thread.Sleep(2000)
                tictac()
            End While
            t1.Abort()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
        cmdoledb.Dispose()
    End Sub
    Private Sub updatetext(ByVal text)
        If Me.InvokeRequired Then
            Me.Invoke(Me.Invoke(New MethodInvoker(AddressOf updatetext, text)))
        Else
            txtnam.Text &= text
        End If
    End Sub

推荐答案

您不理解错误中的英语吗?那是问题吗?

MethodInvoker没有允许多个参数的重载.该错误告诉您一切:

Do you not understand the English in the error? Is that the problem?

MethodInvoker does not have an overload that allows for multiple parameters. The error tells you everything:

ehsan6000写道:

ehsan6000 wrote:

删除"system.windows.forms.methodinvoker"
需要"AddressOf"表达式或
lambda表达式作为其构造函数的 only 参数.

Delegate ''system.windows.forms.methodinvoker''
requires an ''AddressOf''expression or
lambda expression as the only argument to its constructor.

MethodInvoker仅接受一个参数.如果要传递参数，请在调用..."中执行此操作，如下所示:

MethodInvoker only takes one argument. If you want to pass a parameter, you do that in the Invoke...as in:

Me.Invoke(New MethodInvoker(AddressOf updatetext),New Object(){text})

克里斯蒂安(Christian)是对的...我有什么事?两次调用?在进行此操作之前，您需要先了解自己在写什么.

and Christian is right...what''s up with Me.Invoke twice? You need to try to understand what you''re writing before doing it.

您的基本问题是无知和文盲的结合.我假设，尽管您没有告诉我们，但这行是错误的:

Your basic issue is a combination of cluelessness and illiteracy. I assume, despite you not telling us, that this line is the error:

ehsan6000写道:

ehsan6000 wrote:

Me.Invoke(Me.Invoke(New MethodInvoker(AddressOf updatetext，text)))

Me.Invoke(Me.Invoke(New MethodInvoker(AddressOf updatetext, text)))

你为什么打给我两次调用?是因为

一个-这实际上是对的，我.调用返回与AddressOf b-在网上盲目复制代码后出现错误，因此请在这里提出问题，因为您无法使用google，无法阅读并且不知道自己在做什么(因此无法诊断问题) ?

哦，您的代码仍然很糟糕-表示层中的SQL，假定文本框包含int的假设，等等.如果有人在该文本框中键入文本会发生什么?

Why are you calling me.invoke twice ? Is it because

a - this is actually right, me.invoke returns the same thing as AddressOf

b - you get an error after copying code blind off the web, so ask here because you can''t use google, can''t read, and have no idea what you''re doing ( and therefore cannot diagnose the problem ) ?

Oh, your code is still terrible - SQL in the presentation layer, the assumption that a textbox contains an int, etc. What happens if someone types text in to that textbox ?

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