VB错误：“未声明\'mAuto1\'由于其保护级别，它可能无法访问”需要解决方案

问题描述

| 我是C＃和Visual Basic编程的新手。我正在使用Visual Studio 2010，并且尝试从mysql数据库中检索一些数据。使用wamp安装。 我已经通过转到\'Project \'，\'Application Properties \'，\'Settings \'设置了到数据库的连接。 我有此错误\“ \'mAuto1 \'未声明。由于其保护级别，它可能无法访问\”，我似乎无法解决。 下面的代码是一个简单的检索：

Public Class Form1

    Private procAuto As CALCOM.Auto

    Private Function Connect_To_Database() As Boolean
        Dim mErrorNumQuery As Long
        Dim mReturn As Boolean
        procAuto = New CALCOM.Auto
        procAuto.Connect(mErrorNumQuery)
        If mErrorNumQuery = 0 Then
            mReturn = True
        Else
            mReturn = False
        End If
        Connect_To_Database = mReturn
    End Function

    Private Function Get_Weight_By_TicketNumber(ByVal mTicketNumber As String,ByRef mAuto1 As Long,ByRef mAuto2 As Long,ByRef mTotalWeight As Long) As Boolean
        Dim mErrorNumQuery As Long
        Dim mXtr As New CALCOM.xTr
        Dim mRec As ADODB.Recordset
        Dim mReturn As Boolean
        mRec = mXtr.GetList(\"Select Auto1,Auto2,TotalWeight From txticket Where TicketCode = \'\" & mTicketNumber & \"\'\",mErrorNumQuery)
        If mErrorNumQuery = 0 Then
            mReturn = True
            If mRec.RecordCount <> 0 Then
                mRec.MoveFirst()
                mRec.MoveFirst()
                mAuto1 = mRec.Fields(\"Auto1\").Value
                mAuto2 = mRec.Fields(\"Auto2\").Value
                mTotalWeight = mRec.Fields(\"TotalWeight\").Value
            End If
        Else
            mReturn = False
        End If
        Get_Weight_By_TicketNumber = mReturn
    End Function

    Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Label1.Text = mAuto1 <--------------------problem here
    End Sub
End Class

这个程序只是一个ѭ1，以查看我是否可以在表单标签上显示mysql查询的结果。我想通过单击按钮来显示结果 如何解决错误？任何帮助表示赞赏。     

解决方法

mAuto1变量是Get_Weight_By_TicketNumber函数的本地变量，您不能在函数外部使用它。如果需要，可以声明一个类级别的变量并将其设置为mAuto1的值。