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I searched the source code of FCL, and I got confused that string.Equals() uses Object.ReferenceEquals(), and Object.ReferenceEquals() uses == operator to jugde. And then I can't find how the == operator is defined.
So where is the original operator defined?
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The Equality Operator ( ==) is the comparison operator and the Equals() method in C# is used to compare the content of a string. The Equals() method compares only content.
The most common way to compare objects in C# is to use the == operator. For predefined value types, the equality operator (==) returns true if the values of its operands are equal, false otherwise. For reference types other than string, == returns true if its two operands refer to the same object.
The == (equality) and != (inequality) operators check if their operands are equal or not.
In a class, if you overload the Equals method, you should overload the == and != operators, but it is not required.
This is an operator that the language uses to validate that two values are the same. When your code would be compiled this operator would be compiled appropriately in CIL and then when we will be executed by the CLR the two values would be compared to be checked if they are the same.
For instance, this is the CIL code for the Main method:
that the compiler produces for the following program (it's a console application):
class Program { static void Main(string[] args) { int a = 3; int b = 4; bool areEqual = a == b; Console.WriteLine(areEqual); } } Note the IL_0007 line. There a ceq instruction has been emitted. This is that you are looking for, the == operator.
Important Note
This is happening when the == is not overloaded.
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