仅在不等于零时显示堆积柱形图标签值？

Question

我有以下代码，原始代码是：here

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim dtTest As DataTable = New DataTable
        dtTest.Columns.Add("col1", GetType(Integer))
        dtTest.Columns.Add("col2", GetType(Integer))
        dtTest.Columns.Add("col3", GetType(String))

        dtTest.Rows.Add(0, 1, "S")
        dtTest.Rows.Add(0, 1, "H")
        dtTest.Rows.Add(80, 1, "C")
        dtTest.Rows.Add(43, 2, "S")
        dtTest.Rows.Add(11, 2, "H")
        dtTest.Rows.Add(55, 2, "C")
        dtTest.Rows.Add(30, 3, "S")
        dtTest.Rows.Add(85, 3, "H")
        dtTest.Rows.Add(53, 3, "C")
        dtTest.Rows.Add(55, 4, "S")
        dtTest.Rows.Add(55, 4, "H")
        dtTest.Rows.Add(11, 4, "C")

        Dim dv As DataView = New DataView(dtTest)
        dv.Sort = "col2 asc"

        Chart1.Series.RemoveAt(0) 'this is just to remove the default Series in a 
        'VB.NET chart; you may not need this

        Chart1.DataBindCrossTable(dv, "col3", "col2", "col1", "Label=col1")

        For Each cs As Series In Chart1.Series
            cs.ChartType = SeriesChartType.StackedColumn
        Next

    End Sub
End Class

代码生成下面的图表..我想知道如果有一种方法不在列上显示值，如果它为零，如左侧最左列所示或列顶部的总值也会很好。我发现如何在excel中做到这一点，但没有设法实现这个程序。

非常感谢您的帮助

Answer 1

您需要为系列设置Filtering，我可以使用Filter(CompareMethod,Double,Series)以及DataManipulator.FilterSetEmptyPoints和DataManipulator.FilterMatchPoints获得您要查找的结果属性。

修改后的代码

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim dtTest As DataTable = New DataTable
    dtTest.Columns.Add("col1", GetType(Integer))
    dtTest.Columns.Add("col2", GetType(Integer))
    dtTest.Columns.Add("col3", GetType(String))

    dtTest.Rows.Add(0, 1, "S")
    dtTest.Rows.Add(0, 1, "H")
    dtTest.Rows.Add(80, 1, "C")
    dtTest.Rows.Add(43, 2, "S")
    dtTest.Rows.Add(11, 2, "H")
    dtTest.Rows.Add(55, 2, "C")
    dtTest.Rows.Add(30, 3, "S")
    dtTest.Rows.Add(85, 3, "H")
    dtTest.Rows.Add(53, 3, "C")
    dtTest.Rows.Add(55, 4, "S")
    dtTest.Rows.Add(55, 4, "H")
    dtTest.Rows.Add(11, 4, "C")

    Dim dv As DataView = New DataView(dtTest)
    dv.Sort = "col2 asc"

    Chart1.Series.RemoveAt(0) 'this is just to remove the default Series in a 
    'VB.NET chart; you may not need this
    Chart1.DataManipulator.FilterSetEmptyPoints = True 'Points that match filter will be marked as empty
    Chart1.DataManipulator.FilterMatchedPoints = True  'Filter points that match Filter criteria



    Chart1.DataBindCrossTable(dv, "col3", "col2", "col1", "Label=col1")

    For Each cs As Series In Chart1.Series
        Chart1.DataManipulator.Filter(DataVisualization.Charting.CompareMethod.EqualTo, 0, cs)   'Compare if equal to zero
        cs.ChartType = SeriesChartType.StackedColumn
        Dim dpcp As DataPointCustomProperties = New DataPointCustomProperties

    Next

End Sub

<强>结果