WPF has remove graphic PointAnnotations

Hello

I want to delete all my PointAnnotations in a graph. I tried the code below, but it does not work. Is som other medium?

Thank you

/ Axel

For i = 0 To sg. Children.Count - 1

If sg. (I) children. GetType = GetType (pre-numbered) Then

Ugh Children.Remove (i)

EndIf

Next

There are two problems with the code as it is written:

  • First, it uses the Remove method on ObjectCollection instead of the RemoveAt method (i.e. it tries to remove the object i , not the element at index i ).
  • Second, when you remove an element at index i , all the elements later in the collection a shift down, but the For always loop increments i to check the next item, jump adjacent values.

When deleting items, it is best to browse the collection in order to avoid the misalignment index backward:

For i = sg.Children.Count - 1 To 0 Step -1
        If sg.Children(i).GetType = GetType(PointAnnotation) Then
            sg.Children.RemoveAt(i)
        End If
    Next

Tags: NI Software

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