签名与委托不兼容 [英] Signature not compatible with delegate

问题描述

我收到以下错误:

I am getting the following error:

"Method ''Private Sub updatetext(text As Object)'' dose Not have a signature compatible with delegate Delegate Sub MethodInvoker()"

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

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(New MethodInvoker(AddressOf updatetext),New Object(){text})        
Else
        txtnam.Text &= text
        End If
    End Sub

推荐答案

MethodInvoker是不带参数的通用委托(签名).如果要将参数传递给委托，则需要创建自己的Invoker委托，如下所示:

The MethodInvoker is a generic Delegate with no arguments (signature). If you want to pass arguments to a delegate then you need to create your own Invoker Delegate Like this :

Private Delegate Sub UpdateTextInvoker(ByVal MyText As String)'Create your own Invoker Delegate 

    Private Sub UpdateText(ByVal MyText As String)

        If Me.InvokeRequired Then
            Me.Invoke(New UpdateTextInvoker(AddressOf UpdateText), New String() {MyText})'Call your custom invoker
        Else
            txtName.Text = MyText
        End If

    End Sub

希望这会有所帮助

快乐编码

Hope this helps

Happy Coding

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