vb.net传参数 vbnet sender

vb.net引用传递

Private Function ReadFile(ByRef a As String) As String

a = "bian"

End Function

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim a As String = "yuanlai"

ReadFile(a)

''想要的结果就是在这里使用a的值是"bian"

MsgBox(a)

End Sub

===================

以上就可以，不知道你“ByRef a As b”的b是什么东西

相关问答

Q1: VB.NET 将参数传入 存储过程 的 问题?

//存储过程代码

CREATE PROCEDURE [AddNewInvoiceInfo] (@sUserID int,@sClaimMethod varchar(50),@sInvoiceNum varchar(50),@sInvoiceDate datetime,@sBuyCity varchar(50))AS

Insert Into SMB_InvoiceInfo (MemberID,ClaimMethod,InvoiceNum,InvoiceDate,InvoiceCity) Values (@sUserID,@sClaimMethod,@sInvoiceNum,@sInvoiceDate,@sBuyCity)

return @@IDENTITY

GO

//调用存储过程代码

Dim CN As New SqlConnection()

Dim InvoiceID As String

Try

CN.ConnectionString = DBConStr

CN.Open()

Dim CMD As SqlCommand

CMD = New SqlCommand(AddNewInvoiceInfo, CN)

CMD.CommandType = CommandType.StoredProcedure

CMD.Parameters.Add(New SqlParameter(@sUserID, SqlDbType.Int))

CMD.Parameters(@sUserID).Value = CInt(UserID.Text)

CMD.Parameters.Add(New SqlParameter(@sClaimMethod, SqlDbType.VarChar, 50))

CMD.Parameters(@sClaimMethod).Value = TransName.Text

CMD.Parameters.Add(New SqlParameter(@sInvoiceNum, SqlDbType.VarChar, 50))

CMD.Parameters(@sInvoiceNum).Value = InvoiceNum.Text

CMD.Parameters.Add(New SqlParameter(@sInvoiceDate, SqlDbType.DateTime))

CMD.Parameters(@sInvoiceDate).Value = InvoiceDate.SelectedDate.Date

CMD.Parameters.Add(New SqlParameter(@sBuyCity, SqlDbType.VarChar, 50))

CMD.Parameters(@sBuyCity).Value = BuyCity.Text

CMD.Parameters.Add(New SqlParameter(@sInvoiceID, SqlDbType.Int))

CMD.Parameters(@sInvoiceID).Direction = ParameterDirection.ReturnValue

CMD.ExecuteNonQuery()

InvoiceID = CMD.Parameters(@sInvoiceID).Value.ToString()

CMD.Dispose()

Catch ex As Exception

Response.Write(ex.ToString())

Finally

CN.Close()

End Try

Q2: c# 或vb.net Sub过程中定义传递参数

使用可选参数,(以C#4.0为例)

static int plus(int a,int b, int c=0)

{

return a+b+c;

}

Q3: vb.net2005:2个form之间传递参数的问题，高手进

把form1设为启动项在form3中调用当然是空啊。因为这时候还没有发生form2的load事件。你可以在form1的load事件里面对form2的变量付值然后把form2对象传给form3，或者fom2里的变量设为静态的这样不用传对象

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