Question

How to create a read-only IList wrapper around an array with Array.AsReadOnly() method in VB.NET

Answer 1

Module Module1

    Sub Main()

        Dim arr As String() = {"VB.NET", "C", "C++", "PHP", "C#"}

        Dim ilist As IList(Of String) = Array.AsReadOnly(arr)

        Console.WriteLine(ilist(0)) ' VB.NET

        Try
            ilist(1) = "Java" ' Error
        Catch e As NotSupportedException
            Console.WriteLine("{0} - {1}", e.GetType(), e.Message)
        End Try

    End Sub

End Module

' run:
' 
' VB.NET
' System.NotSupportedException - Collection Is read - only.

 

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