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The Semantics of Equality for Anonymous Types



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

The Semantics of Equality for Anonymous Types

While the implementation of the overridden ToString() and GetHashCode() methods is fairly

straightforward, you may be wondering how the Equals() method has been implemented. For

example, if we were to define two “anonymous cars” variables that specify the same name/value

pairs, would these two variables be considered equal or not? To see the results firsthand, update

your Program type with the following new method:

static void EqualityTest()

{

// Make 2 anonymous classes with identical name/value pairs.

var firstCar = new { Color = "Bright Pink", Make = "Saab", CurrentSpeed = 55 };

var secondCar = new { Color = "Bright Pink", Make = "Saab", CurrentSpeed = 55 };



// Are they considered equal when using Equals()?

if (firstCar.Equals(secondCar))

Console.WriteLine("Same anonymous object!");

else


Console.WriteLine("Not the same anonymous object!");


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