C # yield keyword usage,

C # yield keyword usage,

C # has a keyword yield, which simplifies the syntax sugar of traversal operations.

The following Insus. NET use example to illustrate, take last night's article "from the string array to find the number of elements" http://www.cnblogs.com/insus/p/8001026.html

There is a console program:

 

From line #17 to line #29.

According to object-oriented programming, this code should be encapsulated into a category and provide interfaces or methods directly in the class for users to call.
OK. The following Insus. NET creates another class in the program to refactor and encapsulate them:

 

After this change, the console application meets the development requirements, with only one input and one output.