Excel Diagramm Seriesnames in VBA - excel

Question

I'm programming a Makro for a Excel xy-Diagramm
The diagramm is nearly correct, but i have dublicate DataSeriesNames;
I already tried to go through all Series and Compare the Names.
There were no Errors, but it didn't work.
Code was like that:
For a=1 to Count
If ActiveChart.SeriesCollection(Count).Name = Range("A2").Value Then
Name = true
End If
a = a + 1
Next
If Name = false Then
ActiveChart.SeriesCollection.NewSeries
End If
ActiveChart.SeriesCollection(Count).Name = "='Tasks'!$D$" & i
ActiveChart.SeriesCollection(Count).XValues = "='Tasks'!$B$" & i
ActiveChart.SeriesCollection(Count).Values = "='Tasks'!$C$" & i
Mfg Robin

Answer 1

There are a couple of things wrong here.
First of all, you're always looking at the same series! I think you want to replace Count with a in your If statement.
If ActiveChart.SeriesCollection(a).Name
Secondly, once that is corrected, even if your Name variable gets set to True at some point, it may get reset to False later as the For...Next loop continues iterating through the remainder of the series collection. To prevent this, add an Exit For like this:
For a = 1 To Count
If ActiveChart.SeriesCollection(a).Name = Range("A2").Value Then
Name = True
Exit For
End If
a = a + 1
Next
Also, I suspect you haven't declaring Name as a Boolean variable, so by default it's a Variant so its value isn't False to start with! You should declare the variable at the top of your procedure with Dim Name as Boolean, and then if you want Name to be False by default, you should really say so explicitly: Put Name = False before the loop. Moreover, Name is a terrible name for a variable... and so is Count Argh! I think your code should look like this:
Option Explicit
Sub MySub()
Dim a As Long
Dim NameExists As Boolean
Dim SeriesCount As Long
SeriesCount = ActiveChart.SeriesCollection.Count
NameExists = False
For a = 1 To SeriesCount
If ActiveChart.SeriesCollection(a).Name = Range("A2").Value Then
NameExists = True
Exit For
End If
a = a + 1
Next
If NameExists = False Then
' Rest of your code goes here...
End Sub