Solved

.Net 2.0 to .Net 4.0 Conversion Issue

Posted on 2011-03-12
1
430 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
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

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
ASP.net Have sliders change in order 2 22
VB.NET (2008) - Refactoring Question 2 19
Call Controller Action Method from ASPX 2 12
Linq asp.net mvc 13 6
Today is the age of broadband.  More and more people are going this route determined to experience the web and it’s multitude of services as quickly and painlessly as possible. Coupled with the move to broadband, people are experiencing the web via …
User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…

816 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

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now