Devexpress webchartcontrol如何獲得無限的colors集合並存儲在列表數組中

Question

目前我有 204 個項目在 webchartcontrol 中顯示為圖例，我當前的代碼只能支持大約 150 個項目的顏色。 如果超過，則錯誤“索引超出范圍。必須為非負數且小於集合的大小。參數名稱：索引”。 如何獲得無限顏色以存儲在列表數組中？ 請指導我。

我的代碼

    Dim colors As List(Of String) = New List(Of String)()
    Dim colorNames As String() = System.Enum.GetNames(GetType(KnownColor))
    Dim whiteBrightness As Single = Color.FromKnownColor(KnownColor.NavajoWhite).GetBrightness()
    For Each colorName As String In colorNames
        Dim KnownColor As KnownColor = CType(System.Enum.Parse(GetType(KnownColor), colorName), KnownColor)
        Dim knownColorBrightness As Single = Color.FromKnownColor(KnownColor).GetBrightness()
        If (KnownColor > KnownColor.Transparent AndAlso knownColorBrightness < whiteBrightness AndAlso colorName.IndexOf("Gray") = -1) Then
            colors.Add(colorName)

        End If
    Next

   Dim lColor As Dictionary(Of String, String) = New Dictionary(Of String, String)


        Dim colorTracker As Integer = 0
        '''''''''''''''''''''''''
        lColor.Add("Remaining", "DarkGray")


        For Each dr In dt.Rows
            Dim series1 As New Series(dr("tool").ToString(), ViewType.StackedBar)
            series1.ValueScaleType = ScaleType.Numerical
            series1.Points.Add(New SeriesPoint(dr("ID").ToString(), dr("Process")))


            ' series1.ToolTipEnabled = DevExpress.Utils.DefaultBoolean.True
            'series1.ToolTipHintDataMember = dr("tooldata").ToString()
            series1.ToolTipPointPattern = "<span style='font-size:13px'>EQPID: {A} <br/> Recipe: {S} <br/> " + dr("tooldata").ToString() + "</span>"

            chart.Series.Add(series1)
            Dim myview1 As StackedBarSeriesView = CType(series1.View, StackedBarSeriesView)
            myview1.BarWidth = 0.5
            myview1.FillStyle.FillMode = FillMode.Solid



            'CHECK if same item, assigned same color, else assigned other color
            If lColor.ContainsKey(dr("tool").ToString()) Then
                series1.View.Color = Color.FromName(lColor(dr("tool").ToString()))

            Else

                \\error happens here in line series1.View.Color, there 
                 are 204 tool items, but the length returned for colors from  
                 knowncolor is 174, that is why the index 
                 error occurs.My problem is there any other properties that
                 contain unlimited color?

                series1.View.Color = Color.FromName(colors(colorTracker))
                lColor.Add(dr("tool").ToString(), colors(colorTracker))
                colorTracker = colorTracker + 1

            End If
            ''''''''''

        Next

Answer 1

ChartControl 和 WebChartControl 支持系列着色器功能（在 v18.1 和更高版本中可用），該功能允許從一組預定義的鍵或數據源值定義系列顏色模式。 您應該能夠使用內置功能而不是手動初始化系列顏色。