Sort a List of Object in VB NET

Question

I have a list of passengers object  where it has a differents properties    passenger name passenger age passenger surname   And I want to sort this list by age criterion  how can i do this   I know in a list of integer string List Sort   works  but if is an object list  i dont know if its possible to sort by the value of a object property   Thanks

User · Answer

try   Dim sortedList   From entry In mylist Order By entry name Ascending Select entry mylist   sortedList ToList

User · Answer

To sort by a property in the object  you have to specify a comparer or a method to get that property   Using the List Sort method   theList Sort Function x  y  x age CompareTo y age     Using the OrderBy extension method   theList   theList OrderBy Function x  x age  ToList

User · Answer

If you need a custom string sort  you can create a function that returns a number based on the order you specify   For example  I had pictures that I wanted to sort based on being front side or clasp  So I did the following   Private Function sortpictures s As String  As Integer     If Regex IsMatch s   FRONT   Then         Return 0     ElseIf Regex IsMatch s   SIDE   Then         Return 1     ElseIf Regex IsMatch s   CLASP   Then         Return 2     Else         Return 3     End If End Function   Then I call the sort function like this   list Sort Function elA As String  elB As String                    Return sortpictures elA  CompareTo sortpictures elB                 End Function

User · Answer

you must implement IComparer interface   In this sample I ve my custom object JSONReturn  I implement my class like this    Friend Class JSONReturnComparer     Implements IComparer of JSONReturn       Public Function Compare x As JSONReturn  y As JSONReturn  As Integer Implements    IComparer Of JSONReturn  Compare         Return String Compare x Name  y Name      End Function  End Class   I call my sort List method like this        alResult Sort new JSONReturnComparer     Maybe it could help you

[vb.net] Sort a List of Object in VB.NET

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