綁定點

我有我試圖與一些從一個SqlDataSource一系列動態填充圖表控件，這裏是我的圖表控件：綁定點

<asp:Chart ID="chartMonthly" runat="server" Width="920px" ImageLocation="~/Images/Temp/ChartPic_#SEQ(300,3)" Palette="Berry"> 
     <ChartAreas> 
      <asp:ChartArea Name="line"></asp:ChartArea> 
     </ChartAreas> 
    </asp:Chart>

而這裏的我如何動態地添加系列指出：

Private Sub chartMonthly_DataBinding(sender As Object, e As System.EventArgs) Handles chartMonthly.DataBinding 

    Dim conStr As String = ConfigurationManager.ConnectionStrings("GenshenPOS").ConnectionString 
    Dim conn As New SqlConnection(conStr) 

    conn.Open() 

    Dim sqlPoints As New SqlCommand("SELECT [m] AS [月], [Store] AS [門市], SUM([amount]) AS [NTD] FROM vwMonthly WHERE [y] = " & dropYear.SelectedValue & " GROUP BY [m], [Store]", conn) 

    Dim reader As SqlDataReader = sqlPoints.ExecuteReader() 

    While reader.Read() 

     If chartMonthly.Series.IndexOf(reader.Item("門市")) = -1 Then 

      chartMonthly.Series.Add(reader.Item("門市")) 
      chartMonthly.Legends.Add(reader.Item("門市")) 
      chartMonthly.Series(reader.Item("門市")).ChartType = SeriesChartType.Line 
      chartMonthly.Series(reader.Item("門市")).ChartArea = "line" 

     End If 

     chartMonthly.Series(reader.Item("門市")).Points.AddXY("月", "NTD") 

    End While 

    conn.Close() 

End Sub

圖表是基於他們正確地讀取存儲的名稱和創建系列，但我的圖表是空的數據 - 無軸具有值和該系列的線在底部走的圖表爲0 /空值。

我已經單獨運行了底層查詢，並且數據在那裏，並且我假定它看到數據，否則系列和傳說不會被創建，所以我假設我從添加點的方式該系列？！

Image of chart control with series but displaying no datapoints

來源

2013-10-04 Ryan Gillies

你可以嘗試通過明確的鑄造日期時間

chartMonthly.Series(reader.Item("門市")).Points.AddXY(New DateTime(Integer.Parse(dropYear.SelectedValue), Integer.Parse(reader("月").ToString()), 1), "NTD")

（第一月）加入Points.AddXY

來源

2013-10-04 07:58:59

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