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    <p>See below the C# for the VB.Net version - note that there's one additional class (FooFinder) since there are no anonymous methods in VB.NET, so I needed something to be able to store the match state.</p> <p>Here's a more "functional" way to accomplish the same thing, but still using C# 2.0 syntax. Note the important difference from other solutions (looping/dictionaries) is the use of the FindAll method on List, which will iterate over your collection and return all items for which the delegate returns true. C#:</p> <pre><code>using System; using System.Collections.Generic; namespace SplitList { class Program { class Foo { public Foo(string propertyA, int number) { _propertyA = propertyA; _number = number; } private int _number; private string _propertyA; public string PropertyA { get { return _propertyA; } } public int Number { get { return _number; } } } static void Main(string[] args) { List&lt;Foo&gt; foos = new List&lt;Foo&gt;(); foos.Add(new Foo("ValueA", 1)); foos.Add(new Foo("ValueA", 2)); foos.Add(new Foo("ValueA", 3)); foos.Add(new Foo("ValueA", 4)); foos.Add(new Foo("ValueB", 5)); foos.Add(new Foo("ValueB", 6)); foos.Add(new Foo("ValueC", 7)); foos.Add(new Foo("ValueC", 8)); foos.Add(new Foo("ValueC", 9)); List&lt;Foo&gt; aFoos = foos.FindAll(delegate(Foo f) { return f.PropertyA == "ValueA"; }); List&lt;Foo&gt; bFoos = foos.FindAll(delegate(Foo f) { return f.PropertyA == "ValueB"; }); List&lt;Foo&gt; cFoos = foos.FindAll(delegate(Foo f) { return f.PropertyA == "ValueC"; }); WriteFoos("ValueA", aFoos); WriteFoos("ValueB", bFoos); WriteFoos("ValueC", cFoos); Console.ReadLine(); } private static void WriteFoos(string propertyAValue, List&lt;Foo&gt; list) { Console.WriteLine("Group {0}:", propertyAValue); list.ForEach(delegate(Foo f) { Console.WriteLine("Number:{0}, PropertyA:{1}", f.Number, f.PropertyA); }); } } } </code></pre> <p>VB.NET:</p> <pre><code>Module Module1 Class FooFinder Public Sub New(ByVal propertyAValue As String) Me.PropertyAValue = propertyAValue End Sub Public ReadOnly PropertyAValue As String Function Matches(ByVal f As Foo) As Boolean Return (f.PropertyAValue = Me.PropertyAValue) End Function End Class Class Foo Public Sub New(ByVal propertyAValue As String, ByVal number As Integer) _propertyAValue = propertyAValue _number = number End Sub Private _propertyAValue As String Private _number As Integer Public Property PropertyAValue() As String Get Return _propertyAValue End Get Set(ByVal value As String) _propertyAValue = value End Set End Property Public Property Number() As Integer Get Return _number End Get Set(ByVal value As Integer) _number = value End Set End Property End Class Sub Main() Dim foos As New List(Of Foo) foos.Add(New Foo("ValueA", 1)) foos.Add(New Foo("ValueA", 2)) foos.Add(New Foo("ValueA", 3)) foos.Add(New Foo("ValueB", 4)) foos.Add(New Foo("ValueB", 5)) foos.Add(New Foo("ValueC", 6)) foos.Add(New Foo("ValueC", 7)) foos.Add(New Foo("ValueC", 8)) foos.Add(New Foo("ValueC", 9)) Dim aFoos As List(Of Foo) = foos.FindAll(AddressOf New FooFinder("ValueA").Matches) Dim bFoos As List(Of Foo) = foos.FindAll(AddressOf New FooFinder("ValueB").Matches) Dim cFoos As List(Of Foo) = foos.FindAll(AddressOf New FooFinder("ValueC").Matches) WriteFoos("ValueA", aFoos) WriteFoos("ValueB", bFoos) WriteFoos("ValueC", cFoos) Console.ReadLine() End Sub Private Sub WriteFoos(ByVal propertyAValue As String, ByVal list As List(Of Foo)) Console.WriteLine("PropertyAValue:{0}", propertyAValue) For Each f As Foo In list Console.WriteLine("Number:{0}, PropertyAValue:{1}", f.Number, f.PropertyAValue) Next End Sub End Module </code></pre>
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    1. POHow can I split a generic List (of T) based on a property of a list member?
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    1. USDoug Rohrer
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    1. COI like the look of this a lot, converting to VB via Telerik give a compilation error on the word 'Function', any idea how this would translate? (Dim aFoos As List(Of Foo) = foos.FindAll(Function(f As Foo) Do Return f.PropertyA = "ValueA" End Function)
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    2. COI've updated my response with a VB.NET version - slightly different because of the lack of anonymous methods/delegates in VB.NET 2.0, but the same basic idea.
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    3. COPerfect. Thanks.
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