How sort a System.Collections.Generic.List in VB.Net?

Question

I using a genric list(m_equipmentList ) which is collection of objects (Schedule_Payitem).
How can sort list according to a proerty of child object ?

Dim m_equipmentList As New List(Of Schedule_Payitem) 

Need to sort m_equipmentList on basis of resourceid property of Schedule_Payitem.

Answer 1

Are you using VB9? If so, I'd use a lambda expression to create a Comparer(Of Schedule_PayItem). Otherwise, write a short class to implement IComparer(Of Schedule_PayItem). pass whichever one you've got into List.Sort.

An example for the lambda expression (untested):

m_equipmentList.Sort(Function(p1, p2) p1.ResourceID.CompareTo(p2.ResourceID)) 

And for the IComparer(Of Schedule_PayItem):

Public Class PayItemResourceComparer     Implements IComparer(Of Schedule_PayItem)     Public Function Compare(ByVal p1 As Schedule_PayItem, _                             ByVal p2 As Schedule_PayItem) As Integer         Return p1.ResourceID.CompareTo(p2.ResourceID)     End Function End Class  ...  m_equipmentList.Sort(New PayItemResourceComparer) 

Answer 2

I don't know vb.net so I did it in C#

m_equipmentList.Sort(    (payItem1,payItem2)=>payItem1.ResourceID.CompareTo(payItem2.ResourceID)); 

and using the reflector translated it to vb.net hope it helps

m_equipmentList.Sort( Function (ByVal payItem1 As Schedule_Payitem, ByVal payItem2 As Schedule_Payitem)      Return payItem1.ResourceID.CompareTo(payItem2.ResourceID) End Function) 

or you can inherit Schedule_Payitem from IComparable and implement CompareTo and then just call m_equipmentList.Sort()