Wow, I nearly fell out of my chair when I read this little gem on TechCrunch:
Android chief Andy Rubin wrote in a 2005 email, “If Sun doesn’t want to work with us, we have two options: 1) Abandon our work and adopt MSFT CLR VM and C# language – or – 2) Do Java anyway and defend our decision, perhaps making enemies along the way.”
Imagine how different the world would be today if Google had chosen .NET instead of Java as the native development framework for the Android mobile operating system…
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An enumerator enables you to iterate over a collection in a foreach loop. You can use foreach to iterate over all C# collection classes, because all C# collection classes inherit from the IEnumerable interface (regular or generic). IEnumerable contains the GetEnumerator method, which returns an enumerator.
Occasionally you may find a need to create a custom enumerator, which used to be somewhat of a challenge until the yield keyword was introduced. Here is how Microsoft describes yield:
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. This is the value that is returned, for example, in each loop of a foreach statement.
So rather than creating your own enumerator class and managing the enumeration state — which is time consuming and tricky — you can simply write the enumeration logic in the GetEnumerator method, and the yield keyword will automagically wrap your code in a handy-dandy enumerator.
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