Solved

.Net 2.0 to .Net 4.0 Conversion Issue

Posted on 2011-03-12
1
433 Views
Last Modified: 2012-06-27
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.
0
Comment
Question by:wideman1926
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 33

Accepted Solution

by:
Todd Gerbert earned 500 total points
ID: 35117847

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;
    }
}

Open in new window


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;
    }
}

Open in new window

0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …
Suggested Courses

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question