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我已经得到了下面的一段代码,但它没有给我任何输出。{BR​​}

Dim objc As New DistrictPreviousTrends

            Dim objlist As New List(Of DistrictPreviousTrends)

 

            objlist = objc.GetTrends()

 

            Chart3.DataBindCrossTable(objlist, "District_Name", "AcademicYear", "Rate", "")

            For Each item In Chart3.Series

                item.ChartType = SeriesChartType.Area

                item.IsValueShownAsLabel = True

            Next

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