图形不绘制值vb.net

Question

    dtTest.Columns.Add("TestName", GetType(String))
    dtTest.Columns.Add("Score", GetType(Integer))

    Dim cn As New OleDbConnection(connectionString)

    cn.Open()

    Dim cmd As New OleDbCommand("SELECT * From ScoreDB WHERE StudentName='" & SelectStudent.Text & "'", cn)

    cmd.ExecuteNonQuery()

    Dim reader As OleDbDataReader = cmd.ExecuteReader()

    While (reader.Read())

        Dim TestName As String = Convert.ToString(reader("TestName"))

        Dim TestScore As String = Convert.ToString(reader("ScorePercentage"))

        GraphValues.Add(TestName, TestScore)

    End While

    Dim point As KeyValuePair(Of String, Integer)

    For Each point In GraphValues
        dtTest.Rows.Add(point.Key)
        dtTest.Rows.Add(point.Value)
        MsgBox(point.Key)
    Next

    With Chart1.ChartAreas(0)
        .AxisX.Minimum = 0
        .AxisX.Maximum = 10
        .AxisY.Minimum = 0
        .AxisY.Maximum = 100
        .AxisY.Interval = 10
        .AxisX.Title = "Test"
        .AxisY.Title = "Score Percentage"
    End With

    cn.Close()
End Sub

我已经创建了一个表格，应该将得分和测试名称输出到vb.net的柱形图中，它会成功加载数据库中的所有数据，但是无法将其写入图表，最终就像这个

任何帮助都会受到赞赏，因为我现在正在努力解决这个问题，并搜索了MSDN等各种资源。

Answer 1

没有任何东西告诉图表将数据表GraphValues映射到图表。尝试类似下面的内容。你可以稍微修改一下代码

 Chart1.DataSource = GraphValues
 Chart1.Series(0).XValueMember = "TestName"
 Chart1.Series(0).YValueMembers = "Score"

 'Data bind to the selected data source
 Chart1.DataBind()

http://blogs.msdn.com/b/alexgor/archive/2009/02/21/data-binding-ms-chart-control.aspx