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Questions tagged [iequatable]

Interface, which defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

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What is wrong with my IEquatable, IComparable implementation? SortedList throws ArgumentException

I am working on solving a puzzle online and stumbled upon this problem where given a 2D matrix and a number k, I need to return the kth smallest element in the matrix. matrix = [ [ 1, 5, 9], [10, 11, 13], [12, 13, 15] …
Sai
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IEquatable within a tolerance, how to implement GetHashCode()

I have a Point3d struct which implements IEquatable in the following manner: public override bool Equals(object obj) { return obj is Point3d p && Equals(p); } public bool Equals(Point3d other) { return Equals(other,…
Rob Kite
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LINQ Distinct Not Working

I'm trying to select distinct instances from my class but it's not working, even after implements IEqualityComparer (as described here: https://msdn.microsoft.com/en-us/library/bb338049.aspx) AND IEquatable Could someone help? Public Class Teste …
osmarditto
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Compare two Lists returning different results
I have a class called TestResult which looks like this: public class TestResult : IEquatable { public TestResult(string labelName, List correctValues) { this.LabelName = labelName; …
Andrew
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Make IEquatable safe for change

If I add IEquatable to a class, I know that I need to add overrides to Equals, GetHashCode and (for good practice) the == and != operators. When I override these I will check various properties in the class. However, if another (naive) developer…
pos
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NUnit GetResultState throws NullReferenceException

I'm getting an internal NullReferenceException from NUnit 2.6.4 while running a unit test fixture: SetUp : System.NullReferenceException : Object reference not set to an instance of an object at NUnit.Core.NUnitFramework.GetResultState…
Michael
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System.Collections.Generic collection and IEquatable errors

I have the following class based on example code from Microsoft MSDN: Imports System.Collections.Generic Module SharedCode Public Class Fund Implements IEquatable(Of Fund) 'Class Fund must implement Function Equals(other As…
twellsles
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Using LINQ GroupBy to group by reference objects instead of value objects

I want to GroupBy multiple objects in a list of records and not simply multiple values. I am having trouble getting grouping to work with reference type objects. I have a collection of objects that contain Room, Type, and DateTime. Room, Type, and…
jwrightmail
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Why do two equal instances of IEquatable return false?

Consider the following code public class Rectangle : IEquatable { public int Width { get; set; } public int Height { get; set; } public bool Equals(Rectangle other) { return Width == other.Width &&…
Matthew Layton
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IEquatable.Equals from MSDN

I'm looking at IEquatable.Equals on MSDN. Specifically the section for the two Equals operators: public override bool Equals(Object obj) { if (obj == null) return false; Person personObj = obj as Person; if (personObj == null) …
Storm
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How to structure classes to Implement IEquatable and ISerializable

Been banging my head on this for a while now The problem I have is trying to add the IEquatable behaviour so my derived classes can use set operations Intersect of ILink etc. At the moment I have... public interface ILink { int Linkid { get;…
MikeW
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How would you go about making a List<> comparable?

I am using a Telerik GridView, and having an issue trying to sort a column that is made of of a List<>. In this forum entry, the Telerik team states that the grid can sort IComparable and group/filter IEquatable<> no matter of the Silverlight…
JSprang
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C#, Which class fields/members should be considered when overriding GetHashCode and Equals?

There is this excelent question and answer about this topic: Do I HAVE to override GetHashCode and Equals in new Classes? As it mentions: you only need to override them if you need value equality semantics. The System.Object implementation isn't…
Alberto Montellano
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Equals Remove wrong assignment inside Equals

I have following class which i am using to compare some objects it looks like it: Imports System.Collections.Generic Public Class Part Implements IEqualityComparer(Of Part) Public _comparisonType As EqualsComparmission Public Sub…
unknown
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Implement IEquatable in WinRT solution?

So I have a bit of an issue. I'll see how well I can explain it. I have a class that is shared between my windows phone foreground app and the background as a link (they both use the same file) this is because data is serialized from this class and…
user2704766
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