2

本质上，我有一个数据读取器，理论上它将调用一个存储过程，并将返回的查询绑定到图表。

这是我想绑定到图表的数据：

ForecastDesc    Previous    Current Budget  Forecast 4  Forecast 7 
Period1 966025.79   1466872.95  1000000.00  0.00    0.00
Period2 1051175.09  1489785.15  1000000.00  0.00    0.00
Period3 1205352.26  1552806.49  1000000.00  0.00    0.00
Period4 1261483.84  1544562.06  1000000.00  50.00   0.00
Period5 1298918.58  1681396.55  1000000.00  45.00   0.00
Period6 1314396.68  1611695.58  10000000.00 50.50   0.00
Period7 1465150.48  1622354.24  1000000.00  50.50   123.00
Period8 1426084.73  1632609.46  1000000.00  50.50   0.00
Period9 1395144.09  370334.88   1000000.00  50.50   0.00
Period10    1347280.57  0.00    1000000.00  50.50   0.00
Period11    1374741.53  0.00    1000000.00  50.50   0.00
Period12    1331704.11  0.00    1000000.00  50.20   0.00
Period13    1367272.27  0.00    1000000.00  50.70   0.00

我的vb代码如下：

    Protected Sub YearList_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles YearList.SelectedIndexChanged

    Chart1.Visible = True

    mySqlConn = New SqlConnection
    mySqlConn.ConnectionString = "Server=" + dbServerName + "; Database=" + dbCatalogName + "; Trusted_Connection=True;"


    pSql = New SqlCommand

    pSql.Connection = mySqlConn
    pSql.CommandType = CommandType.StoredProcedure
    pSql.CommandText = "dbo.[sp_DW_Transpose_BudgetForecast]"


    pSql.Parameters.Add("@seg1", SqlDbType.NVarChar)
    pSql.Parameters.Add("@seg2", SqlDbType.NVarChar)
    pSql.Parameters.Add("@seg3", SqlDbType.NVarChar)
    pSql.Parameters.Add("@year", SqlDbType.NVarChar)

    pSql.Parameters("@seg1").Value = Seg1.SelectedItem.Text
    pSql.Parameters("@seg2").Value = Seg2.SelectedItem.Text
    pSql.Parameters("@seg3").Value = Seg3.SelectedItem.Text
    pSql.Parameters("@year").Value = YearList.SelectedItem.Text

    pSql.Connection.Open()
    pReader = pSql.ExecuteReader(CommandBehavior.CloseConnection)

    While pReader.Read()
        Chart1.DataBindTable(pReader)
    End While

    pReader.Close()
    pReader = Nothing

    mySqlConn.Close()



End Sub

当我的 Web 程序准备好创建图表时，我收到以下错误：

Server Error in '/' Application.

Specified method is not supported.

Description: An unhandled exception occurred during the execution of the current web          request. Please review the stack trace for more information about the error and where it   originated in the code. 

Exception Details: System.NotSupportedException: Specified method is not supported.

Source Error: 


Line 111:
Line 112:        While pReader.Read()
Line 113:            Chart1.DataBindTable(pReader)
Line 114:        End While
Line 115:


Stack Trace: 


[NotSupportedException: Specified method is not supported.]
 System.Data.Common.DbEnumerator.Reset() +65
 System.Web.UI.DataVisualization.Charting.ChartImage.GetDataSourceMemberNames(Object     dataSource, Boolean usedForYValue) +2363
 System.Web.UI.DataVisualization.Charting.ChartImage.DataBindTable(IEnumerable dataSource, String xField) +59
 System.Web.UI.DataVisualization.Charting.Chart.DataBindTable(IEnumerable dataSource) +36
 Forecasting.WebForm1.YearList_SelectedIndexChanged(Object sender, EventArgs e) in 
 System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +113
 System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() +143
     System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +10
 System.Web.UI.Page.RaiseChangedEvents() +135
 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean    includeStagesAfterAsyncPoint) +4867

 Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET    Version:4.0.30319.1

无论如何，我不确定 Databindtable 是否是我应该使用的正确方法，甚至可能是 Databindcrosstable。我已经盯着这个问题看了四天了，现在我呼吁您的专业知识来指导我正确的方向。

4

1 回答 1

0

我相信问题是您正在调用.DataBindTable()并传入 a DataReader，但 DataReader没有实现IEnumerable，因此有关该方法的错误不受支持。尝试将数据转储到DataTableorDataSet并将其作为参数传递给.DataBindTable()

Chart.DataBindTable 方法

于 2012-09-20T18:27:30.983 回答