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

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal