我正在使用这个功能:
Private Sub Trigger_sales(HIden As Guid)
        Dim connection As New SqlConnection(connectionString)
        connection.Open()
        Dim Command As New SqlCommand()
        Command.Connection = connection
        Command.CommandType = CommandType.StoredProcedure
        Command.CommandText = "[WebSite].[ValidateWebTran]"
        Command.Parameters.Add("@UidWenTranGUID", SqlDbType.UniqueIdentifier)
        Command.Parameters("@UidWenTranGUID").Value = HIden
        Command.Parameters.Add("@sResultDesc", SqlDbType.VarChar)
        Command.Parameters("@sResultDesc").Direction = ParameterDirection.Output
        Command.ExecuteScalar()
        If (String.IsNullOrEmpty(error_process.text = Command.Parameters("@sResultDesc").Value.ToString)) Then
            complete_sales(HIden)
        End If
    End Sub
导致此错误:
String[1]:Size 属性的大小为 0 无效。
谁能看到我做错了什么?