Creating a Read Only List using LINQ

Have you felt the need of creating a read only List<> ? LINQ makes it very simple with the AsReadOnly() method. Here's how

C#

List<int> integ = new List<int>(){100,200,300,400,500};

IList<int> noModif = integ.AsReadOnly();

foreach (var i in noModif)

{

    // print i

}

 

try

{

    noModif.Add(600);

}

catch(Exception ex)

{

    // Exception raised stating that this collection is read only

}

VB.NET

 

Dim integ As New List(Of Integer)(New Integer() {100, 200, 300, 400, 500})

Dim noModif As IList(Of Integer) = integ.AsReadOnly()

For Each i In noModif

' print i

Next i

 

Try

    noModif.Add(600)

Catch ex As Exception

' Exception raised stating that this collection is read only

End Try