从 List 转换为 IEnumerable 格式 [英] Convert from List into IEnumerable format

问题描述

IEnumerable<Book> _Book_IE
List<Book> _Book_List

如何将_Book_List转成IEnumerable格式?

推荐答案

您不需要转换它.List 实现了IEnumerable 接口所以它已经是一个可枚举.

You don't need to convert it. List<T> implements the IEnumerable<T> interface so it is already an enumerable.

这意味着拥有以下内容是完全没问题的:

This means that it is perfectly fine to have the following:

public IEnumerable<Book> GetBooks()
{
    List<Book> books = FetchEmFromSomewhere();    
    return books;
}

以及:

public void ProcessBooks(IEnumerable<Book> books)
{
    // do something with those books
}

可以调用:

List<Book> books = FetchEmFromSomewhere();    
ProcessBooks(books);

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