Question

当我针对以下代码运行代码分析时：

Protected Function GetOrderEntry() As IList(Of OE)
    Dim results As IList(Of OE) = New List(Of OE)()
    Using connection As IDbConnection = DbProviderFactories.GetFactory("System.Data.SqlClient").CreateConnection()
        connection.ConnectionString = ConfigurationManager.AppSettings("OrderEnterConnection")
        Using command As IDbCommand = connection.CreateCommand()
            command.CommandTimeout = 120
            command.CommandText = "Exec up_ViewOrderDetail_2012_Order '" & MemberNo1.Value & "','" & CustNo.Value & "','DEFAULT','" & OrderNo.Value & "','" & DeliveryDate.SelectedDate & "','','','','1'"
            connection.Open()
            Try
                Dim reader As IDataReader = command.ExecuteReader()
                results = PopulateGrid(reader)
            Catch ex As SqlException
                results.Clear()
                connection.Close()
            End Try
        End Using
    End Using
    Return results
End Function

......我明白了，

＆＃34; CA2202多次弃置物品对象＆＃39;连接＆＃39;可以在方法＆＃39; OrderConfirm.GetOrderEntry（）＆＃39;中多次处理。为避免生成System.ObjectDisposedException，不应在对象上多次调用Dispose ＆＃34;

光标位于最终＆＃34;结束时使用＆＃34;线;这被视为双重处置对象？并不是＆＃34;使用＆＃34;块需要以这种方式终止吗？

Answer 1

我尝试删除connection.createcommand和connection.Close()。它运作良好

Protected Function GetOrderEntry() As IList(Of OE)
    Dim results As IList(Of OE) = New List(Of OE)()
    Using connection As IDbConnection = DbProviderFactories.GetFactory("System.Data.SqlClient").CreateConnection()
        connection.ConnectionString = ConfigurationManager.AppSettings("OrderEnterConnection")
        Using command As New IDbCommand 
            Command.connection = connection
            command.CommandTimeout = 120
            command.CommandText = "Exec up_ViewOrderDetail_2012_Order '" & MemberNo1.Value & "','" & CustNo.Value & "','DEFAULT','" & OrderNo.Value & "','" & DeliveryDate.SelectedDate & "','','','','1'"
            connection.Open()
            Try
                Dim reader As IDataReader = command.ExecuteReader()
                results = PopulateGrid(reader)
               Reader.close()
            Catch ex As SqlException
                results.Clear()

            End Try
        End Using
    End Using
    Return results
End Function

如何防止此代码多次处理对象？

1 个答案: