How to Pick last 1000 elements from a generic collection

[teguh123]

Say a collection grow. Once it's size reach 10k, I want to get rid the first 9k. How to do so?

Oh ya I could use removeRange.

Is there another function that will output say, the last 1k of the element, say if I do not want to remove anything? Something like tail or something.

[jmcilhinney]

Assuming .NET 3.5 or later, you have LINQ at your disposal:

myList = myList.Skip(myList.Count - 1000).ToList()

That will skip all but the last 1000 items, then create a new List from the rest.

If you're using an earlier version, or even if you're not, you can use the CopyTo method that every collection has:

Dim myArray(999) As String
 
myList.CopyTo(myList.Count - 1000, myArray, 0, 1000)
myList = New List(Of String)(myArray)

[.paul.]

try this:

Public Class Form1
    Dim integerList As New List(Of Integer)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For x As Integer = 1 To 10
            integerList.Add(x)
        Next
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim tempList As List(Of Integer) = integerList.Skip(8).ToList
        For Each i In tempList
            MsgBox(i)
        Next
    End Sub
End Class

[jmcilhinney]

It must be the cold over there that has made your fingers too slow to keep up Paul.

[.paul.]

yeah that's what it is, cobber

[teguh123]

But then again, I can no longer rate JM because he helped me so much. Maybe if I give rating to everyone it'll work again as usual occasionally.

[.paul.]

you need to rate 10 other members since last time you rated him...

[teguh123]

I know. To be frank, 10 is kind of unfair because again and again JMcilhinney is the one that helped me. The least I can do for now is spell his name correctly. Not Anglo Saxon aren't you JM?