morelinq - DistinctBy with two properties in VB.NET -

looking @ select distinct 2 properties in list possible use distinctby extensionmethod 2 properties. tried convert vb.net, i'm not getting expected results

test class:

public class test     public property id integer     public property name string      public overrides function tostring() string         return id & " - " & name     end function end class 

test method:

private sub runtest()     dim testlist new list(of test)      testlist.add(new test() {.id = 1, .name = "a"})     testlist.add(new test() {.id = 2, .name = "a"})     testlist.add(new test() {.id = 3, .name = "a"})     testlist.add(new test() {.id = 1, .name = "a"})     testlist.add(new test() {.id = 1, .name = "b"})     testlist.add(new test() {.id = 1, .name = "a"})      dim result ienumerable(of test)      result = testlist.distinctby(function(element) element.id)     '1 -     '2 -     '3 -      result = testlist.distinctby(function(element) element.name)     '1 -     '1 - b      result = testlist.distinctby(function(element) new {element.id, element.name})     '1 -     '2 -     '3 -     '1 -     '1 - b     '1 -      'expected:     '1 -     '2 -     '3 -     '1 - b end sub 

is @ possible in vb.net using anonymous types? doing this:

result = testlist.distinctby(function(element) element.id & "-" & element.name) 

is working, therefore i'm guessing i'm missing equality in anonymous types here.

you need write key before property. like

new {key element.id, key element.name} in vb.

so,

result = testlist.distinctby(function(element) new {key element.id, key element.name}) 

see documentation anonymous types in vb more details.