错误BC30518：重载解析失败，因为无法使用以下参数调用可访问的“添加”：

Question

我正在编写Windows服务 ，据此它将在VS 2013中生成图表，但是，出现此错误BC30518：重载解析失败，因为无法使用这些参数调用可访问的“添加”

我添加了参考：System.Web.Data.Visualization，但是仍然出现错误。

下面是我的代码

connect_EWS.ConnectionString = Constr_EWS
connect_EWS.Open()
Dim ds As New DataSet()
Dim query As String = "SELECT        Team_Name, CAST(ROUND(SUM(ActiveWorkforce) / SUM(TotalWorkforce), 2) AS float) * 100 AS Expr1 FROM dbo.DailyActiveWorkforce GROUP BY Team_Name"
Dim cmd As SqlCommand = New SqlCommand(query, connect_EWS)
cmd.ExecuteNonQuery()

Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
da.Fill(ds, "DailyActiveWorkforce")

If ds.Tables("DailyActiveWorkforce").Rows.Count > 1 Then
    Chart2.DataSource = ds.Tables("DailyActiveWorkforce")

End If

Dim series1 As New Series

series1.Name = "Test"
series1.ChartType = SeriesChartType.Column

series1.XValueMember = "Team_Name"
series1.YValueMembers = "Expr1"
'' ChartColorPalette.BrightPastel.ToString()
Chart2.Series.Add(series1) '* --> here is the error being generated.

Me.ExecuteQuery(cmd, "UPDATE")
connect_EWS.Close()

仅提醒您，正在尝试创建的是Web服务。

谢谢您的帮助