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.Net 2.0 to .Net 4.0 Conversion Issue

I'm trying to convert an Asp.net 2.0 application into an Asp.net 4.0 application.  I didn't write the original code and don't have access to the coders.  The line of code: return (Thread.CurrentPrincipal as IChatPrinciple) is not working properly.  I know that you cannot convert between two derived classes, bu the code worked in .net 2.0. In making the upgrade I'd like to know what change between the frameworks could have caused it to fail.  I'd really appreciate the help.  Thanks.
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wideman1926
Asked:
wideman1926
1 Solution
 
Todd GerbertIT ConsultantCommented:

C# 4.0 and the .Net Framework 4.0 is a super-set of C# 2.0/3.0 and .Net 2.0/3.5.  So far as I know anything written for .Net 2.0 should compile without change in 4.0.

I suppose it's possible that your project is missing a reference...?

Although, Thread.CurrentPrinciple by default doesn't return an object that implements IChatPrinciple, so that statement shouldn't work in any version of C#.

You must've had some code somewhere that sets Thread.CurrentPrinciple to an object that does implement IChatPrinciple.  Any idea where that code's supposed to be in your project, and can verify it's still there?

Doesn't work:
using System;
using System.Threading;

interface IChatPrincipal
{
    string ChatName { get; }
}

class ChatPrincipal : IChatPrincipal
{
    public string ChatName
    {
        get { return "Mickey Mouse"; }
    }
}

class Program
{
    static void Main(string[] args)
    {
        IChatPrincipal principal = GetChatPrincipal();
        Console.WriteLine(principal.ChatName);
        Console.ReadKey();
    }

    static IChatPrincipal GetChatPrincipal()
    {
        return Thread.CurrentPrincipal as IChatPrincipal;
    }
}

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Does work:
using System;
using System.Threading;
using System.Security.Principal;

interface IChatPrincipal : IPrincipal
{
    string ChatName { get; }
}

class ChatPrincipal : IChatPrincipal
{
    public string ChatName
    {
        get { return "Mickey Mouse"; }
    }

    public IIdentity Identity
    {
        get { return new GenericIdentity(this.ChatName); }
    }

    public bool IsInRole(string role)
    {
        if (role.ToLower() == "rodent")
            return true;
        else
            return false;
    }
}

class Program
{
    static void Main(string[] args)
    {
        SetChatPrincipal();
        IChatPrincipal principal = GetChatPrincipal();
        Console.WriteLine("Chat name: " + principal.ChatName);
        Console.ReadKey();
    }

    static void SetChatPrincipal()
    {
        Thread.CurrentPrincipal = new ChatPrincipal();
    }

    static IChatPrincipal GetChatPrincipal()
    {
        return Thread.CurrentPrincipal as IChatPrincipal;
    }
}

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