Solved

Using IEqualityComparer

Posted on 2009-07-09
2
433 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
2 Comments
 
LVL 4

Accepted Solution

by:
Woodz earned 500 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

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

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…
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

679 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