Creating a Read Only List using LINQ

Tweet

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

Tweet

About The Author

Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.