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c# Programming Glossary: equalityWhat is “Best Practice” For Comparing Two Instances of a Reference Type? http://stackoverflow.com/questions/104158/what-is-best-practice-for-comparing-two-instances-of-a-reference-type recently up until now I have been happily overriding the equality operator and or Equals method in order to see if two references.. and so on. Most reference types should not overload the equality operator even if they override Equals . However if you are implementing.. such as a complex number type you should override the equality operator. c# .net comparison operator overloading equality..
http://stackoverflow.com/questions/1300088/distinct-with-lambda have an enumerable of objects for which I need to specify equality the only available overload is var distinctValues myCustomerList.Distinct.. myCustomerList.Distinct someEqualityComparer The equality comparer argument must be an instance of IEqualityComparer T..
Remove duplicates in the list using linq http://stackoverflow.com/questions/1606679/remove-duplicates-in-the-list-using-linq To match on only some of the properties create a custom equality comparer e.g. class DistinctItemComparer IEqualityComparer Item..
http://stackoverflow.com/questions/2138429/hash-and-salt-passwords-in-c-sharp convert it back. You should note that you cannot use the equality operator on byte arrays it checks references and so you should..
Why .NET String is immutable? [duplicate] http://stackoverflow.com/questions/2365272/why-net-string-is-immutable the semantics are more like value types in particular equality is based on state rather than identity. This means that abc.. require immutability makes uses as keys where maintaining equality to previous values is vital much easier to ensure correctness..
Why is it important to override GetHashCode when Equals method is overridden? http://stackoverflow.com/questions/371328/why-is-it-important-to-override-gethashcode-when-equals-method-is-overridden collision and Equals will be called to see if it is a real equality or not. In this case it looks like return FooId is a suitable..
Can't operator == be applied to generic types in C#? http://stackoverflow.com/questions/390900/cant-operator-be-applied-to-generic-types-in-c of the operator in MSDN For predefined value types the equality operator returns true if the values of its operands are equal..
Differences in string compare methods in C# http://stackoverflow.com/questions/44288/differences-in-string-compare-methods-in-c-sharp if testString anotherStirng Note I am looking for equality in this example not less than or greater than but feel free.. option it will use what looks like a direct ordinal equality check ie. is not the same as SS in any language or culture stringValue.. how to compare. My advice if you just want to check for equality is to make up your mind wether you want to use a culture dependant..
Linq Distinct on a particular Property http://stackoverflow.com/questions/489258/linq-distinct-on-a-particular-property properties you can use anonymous types which implement equality appropriately var query people.DistinctBy p new p.Id p.Name.. comparer for the keys though if you want to pass in an equality comparer just pass it on to the HashSet constructor. share..
Difference Between Equals and == http://stackoverflow.com/questions/971954/difference-between-equals-and to the same object. This is also called reference equality . Java doesn't have any user defined operator overloading. In.. it will behave like Java i.e. comparing for reference equality . However if there's an overload which matches the compile time.. can behave how it wants but it typically implements value equality i.e. a and b can refer to different but equal values and it..
How to Compare two objects in unit test? http://stackoverflow.com/questions/2046121/how-to-compare-two-objects-in-unit-test for is what in xUnit Test Patterns is called Test Specific Equality . While you can sometimes choose to override the Equals method.. choose to override the Equals method this may lead to Equality Pollution because the implementation you need to the test may.. 's Likeness class offers general purpose Test Specific Equality. With your Student class this would allow you to write a test..
Can we define implicit conversions of enums in c#? http://stackoverflow.com/questions/261663/can-we-define-implicit-conversions-of-enums-in-c _isInitialized true #endregion #region Conversion and Equality public static TDerived Convert TValue value return _values..
Returning a default value. (C#) http://stackoverflow.com/questions/367378/returning-a-default-value-c
c# NaN comparison differences between Equals() and == http://stackoverflow.com/questions/4933769/c-sharp-nan-comparison-differences-between-equals-and on System.Object via the ReferenceEquals method. 8.2.5.2 Equality For value types the equality operator is part of the definition.. Definitions of equality should obey the following rules Equality should be an equivalence operator as defined above. Identity.. earlier. If either or both operand is a boxed value ... Equality is implemented on System.Object via the Equals method. Note..
LINQ Select Distinct with Anonymous Types http://stackoverflow.com/questions/543482/linq-select-distinct-with-anonymous-types a read through K. Scott Allen's excellent post here And Equality for All ... Anonymous Types The short answer and I quote Turns..
Testing Equality of Arrays in C# http://stackoverflow.com/questions/649444/testing-equality-of-arrays-in-c-sharp Equality of Arrays in C# I have two arrays. For example int Array1 new..
Operator Overloading with Interface-Based Programming in C# http://stackoverflow.com/questions/728434/operator-overloading-with-interface-based-programming-in-c-sharp into a problem when overloading operators specifically the Equality and Inequality operators . Assumptions I'm using C# 3.0 .NET..
When Should a .NET Class Override Equals()? When Should it Not? http://stackoverflow.com/questions/9709088/when-should-a-net-class-override-equals-when-should-it-not 4 documentation Guidelines for Implementing Equals and the Equality Operator omits that statement although one post in Community..
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