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POGetHashCode and Equals implementation in Dictionary C#
 

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    <p>I came to this site searching for object comparison in Dictionary, and i came to know that overriding GetHashCode and Equals are a must for doing object comparison in C#. Here is a piece of code that i have been trying to solve out, using FOREACH iteration Method. But my Boss says to do the same without using any iteration(maybe by using containskey or containsvalue method), due to performance issues. Any help is highly welcome..</p> <pre><code> public class employee { public string empname { get; set; } public string location { get; set; } public double kinid { get; set; } public double managerKin { get; set; } public override bool Equals(object obj) { return base.Equals(obj); } public override int GetHashCode() { return base.GetHashCode(); } } public class manager { public string managername { get; set; } public double kinid { get; set; } public override int GetHashCode() { return 17 * managername.GetHashCode() + kinid.GetHashCode(); } } public class program { public static void Main() { employee emp = new employee(); employee emp2 = new employee(); manager mng = new manager(); manager mng2 = new manager(); emp.empname = "Deepak"; emp.location = "Pune"; emp.kinid = 36885; emp.managerKin = 007; emp2.empname = "Astha"; emp2.location = "Pune"; emp2.kinid = 30000; emp2.managerKin = 007; mng.kinid = 007; mng.managername = "Gaurav"; mng2.kinid = 001; mng2.managername = "Surya"; Dictionary&lt;employee, manager&gt; relations = new Dictionary&lt;employee, manager&gt;(); relations.Add(emp, mng); relations.Add(emp2, mng2); Console.ForegroundColor = ConsoleColor.Yellow; Console.WriteLine("The Manager details are :"); foreach (var element in relations) Console.WriteLine(" \n KINID : {0} \n Manager'sName : {1}",element.Value.kinid, element.Value.managername); Console.WriteLine("Enter the details of the manager.."); Console.ForegroundColor = ConsoleColor.Gray; Console.Write("\nManager's Kin : "); double mkin = Convert.ToDouble(Console.ReadLine()); Console.Write("Manager's Name : "); string mname = Console.ReadLine(); manager mng1 = new manager(); mng1.kinid = mkin; mng1.managername = mname; int hashvalue = 17 * mname.GetHashCode() + mkin.GetHashCode(); #region BY USING FOREACH LOOP int i = 0; foreach (var element in relations) { if (element.Value.GetHashCode() == hashvalue) { i += 1; if (i == 1) { Console.WriteLine("The Following employees report to the Manager : {0}", mname); } Console.WriteLine(element.Key.empname + " " + element.Key.kinid + " " + element.Key.location + " " + element.Key.managerKin); } } if (i == 0) { Console.WriteLine("sorry the manager's details you entered \"{0}\" \"{1}\" does not exist in our database..", mng1.managername, mng1.kinid); } #endregion Console.ReadLine(); } } </code></pre>
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    1. USLetsKickSomeAss in .net
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    1. CO-1, Your sample is very long and contains too many unrelated details. Also it is not clear what is your question - as you've already stated dictionary is good for searches by key, so just do it...
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      1. USAlexei Levenkov
    2. COalexei levenkov : you can run this sample code on your debugger.
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    3. CO@AlexeiLevenkov This question is about searching by value...
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