zed graph x axis labels

I am trying to loop through my datatable column sdescr and use the text in the columns as the labels of my x axis, but it isnt working i am getting this error

Value of type 'System.Collections.Generic.List(Of String)' cannot be converted to '1-dimensional array of String'.

For i As Integer = 0 To myCurve1.Points.Count - 1
      开发者_如何学运维  Dim pt As PointPair = myCurve1.Points(i)
        ' Create a text label from the Y data value   
        Dim text As New TextObj(pt.Y.ToString("f0"), pt.X, pt.Y + 0.1, CoordType.AxisXYScale, AlignH.Left, AlignV.Center)
        text.ZOrder = ZOrder.A_InFront
        text.FontSpec.Angle = 90
        myPane.GraphObjList.Add(text)


        Dim labels As New List(Of String)

        For Each row As DataRow In tablegraph.Rows
            labels = row.Item("SDESCR")
        Next row

        myPane.XAxis.Scale.TextLabels = labels
        myPane.XAxis.Type = AxisType.Text
    Next

You need to remove the code to get the labels out of your For Next loop that is creating points.

Which means this

    Dim labels As New List(Of String)          
    For Each row As DataRow In tablegraph.Rows             
    labels = row.Item("SDESCR")         
    Next row          

    myPane.XAxis.Scale.TextLabels = labels         
    myPane.XAxis.Type = AxisType.Text

Now, outside of the loop plotting points, you need to go through your DataTable

Please look at the error you're getting... The List of String can't be converted into a string array. Those objects aren't equivalent.

One option would be to do something like this (after your loop to plot points)

Dim labels(tablegraph.Rows.Count - 1) as String

For i As Integer = 0 To tablegraph.Rows.Count - 1
     labels(i) = tablegraph.Row(i).Item("SDESCR")
Next

myPane.XAxis.Scale.TextLabels = labels         
myPane.XAxis.Type = AxisType.Text

I don't have Zed here on this computer, so I haven't checked this in Visual Studio, but this should give you a very decent direction.