Detailed explanation of sample code of c# index and iterator

C

is a design idea and design pattern. In C#, an iterator can be easily implemented, that is, Ienumeratorinterface. For example, I have a student class, and now I want to encapsulate a studentCollection. The code is as follows:

Student Class:

StudentCollection Class:

Very simple encapsulation, only There is a field, that is studentList, the type is list1f479e44f2c9bd2301ecbd2b69e4d7bf, and implements Ienumerator I used the interface code with the help of studentList, because this class implements this interface, so just use it. In this way, I can foreach traverse studentCollection:

Code description:

##1. newA studentCollection object, and use an initializer to initialize each one by one studentObject

2.       Use foreach to traverse each student

3. ## 取 3 3 3 3 3 3 3 3 3 to the string, and then pop up the prompt box display #

Is there any other way to implement the Ienumerator interface? The answer is yes, the code is as follows:

##

public IEnumerator GetEnumerator()
        {
            foreach (Student s in studentList)
            {
                yield return s;////使用yield关键字实现迭代器
            }
        }

##About index symbol and index symbol overloading:

Careful readers may have discovered that in the studentCollection class , I defined two index characters:

////Access through index

 public Student this[int index]
        {
            get
            {
                return studentList[index];
            }
        }

////Access by student name

##

 public Student this[string name]
        {
            get { return studentList.Single(s => s.StudentName == name); }
        }

The index overloading mechanism enables encapsulation Appear more flexible and powerful.

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