Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Using IEqualityComparer

Posted on 2009-07-09
2
Medium Priority
?
450 Views
Last Modified: 2012-05-07
Code generates 2 errors
Error      1      Using the generic type 'System.Collections.Generic.IEqualityComparer<T>' requires '1' type arguments      C:\Documents and Settings\xxxx\My Documents\Visual Studio 2005\Projects\HashInsensitiveComparer216\HashInsensitiveComparer216\Program.cs

Error      2      The type or namespace name 'CaseInsensitiveComparer' could not be found (are you missing a using directive or an assembly reference?)      C:\Documents and Settings\xxxx\My Documents\Visual Studio 2005\Projects\HashInsensitiveComparer216\HashInsensitiveComparer216\Program.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Globalization;
 
namespace HashInsensitiveComparer216
{
    class Program
    {
        static void Main(string[] args)
        {
            Hashtable dehash = new Hashtable(new InsensitiveComparer());
            dehash["First"] = "1st";
            dehash["Second"] = "2nd"; 
            dehash["Third"] = "3rd"; 
            dehash["Fourth"] = "4th"; 
            dehash["fourth"] = "5th";
 
            Console.WriteLine(dehash.Count); // 4 
        }
        public class InsensitiveComparer : IEqualityComparer
        {
            CaseInsensitiveComparer _comparer = new CaseInsensitiveComparer();
            public int GetHashCode(object obj)
            {
                return obj.ToString().ToLowerInvariant().GetHashCode();
            }
 
            public new bool Equals(object x, object y)
            {
                if (_comparer.Compare(x, y) == 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }
    }
}

Open in new window

0
Comment
Question by:AstroGuy
[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
2 Comments
 
LVL 4

Accepted Solution

by:
Woodz earned 2000 total points
ID: 24814869
You are using the namespace System.Collections.Generic, which contains the generic IEqualityComparer<T> interface. It is complaining because you have not specified the generic type of this interface. If you intended to use the old, non-generic interface, change the using namespace to System.Collections.
0
 

Author Closing Comment

by:AstroGuy
ID: 31601658
Workrd like a charm
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

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

Summary: Persistence is the capability of an application to store the state of objects and recover it when necessary. This article compares the two common types of serialization in aspects of data access, readability, and runtime cost. A ready-to…
Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

688 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