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yield statement implementation
I've seen msdn docs and it says:
The yield keyword signals to the compiler that the method in which it appears is an iterator block. The compiler generates a class to implement the behavior that is expressed in the iterator block. In the iterator block, the yield keyword is used together with the return keyword to provide a value to the enumerator object.
So it means yield keyword is a Syntactic sugar and compiler does the heavy work of generating the Iterator. (Am I Correct ?)
Then what is the generated implementation code for this syntactic sugar.
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yield keyword is used to create a generator function. A type of function that is memory efficient and can be used like an iterator object.
The yield keyword, first introduced in C# 2.0, T returns an object that implements the IEnumerable interface. The IEnumerable interface exposes an IEnumerator that can used to iterate a non-generic collection using a foreach loop in C#.
In the iterator block, the yield keyword is used together with the return keyword to provide a value to the enumerator object. This is the value that is returned, for example, in each loop of a foreach statement. The yield keyword is also used with break to signal the end of iteration."
In computer science, syntactic sugar is syntax within a programming language that is designed to make things easier to read or to express. It makes the language "sweeter" for human use: things can be expressed more clearly, more concisely, or in an alternative style that some may prefer.
The generated code depends on the original, but generally speaking a state machine gets generated which keeps track of the current state of the collection.
See yield statement implementation, this answer by Eric Lippert and this blog post by Jon Skeet.
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