正确使用'收益率'

问题：

The yield keyword is one of those keywords in C# that continues to mystify me, and I've never been confident that I'm using it correctly. yield关键字是C＃中那些继续使我神秘化的关键字之一，而且我从未确信我正确使用它。

Of the following two pieces of code, which is the preferred and why? 以下两段代码中，哪个是首选，为什么？

Version 1: Using yield return 版本1：使用收益率返回

public static IEnumerable<Product> GetAllProducts()
{
    using (AdventureWorksEntities db = new AdventureWorksEntities())
    {
        var products = from product in db.Product
                       select product;

        foreach (Product product in products)
        {
            yield return product;
        }
    }
}

Version 2: Return the list 版本2：返回列表

public static IEnumerable<Product> GetAllProducts()
{
    using (AdventureWorksEntities db = new AdventureWorksEntities())
    {
        var products = from product in db.Product
                       select product;

        return products.ToList<Product>();
    }
}

---

解决方案：

参考一： https://stackoom.com/question/1ifK/正确使用-收益率
参考二： https://oldbug.net/q/1ifK/Proper-use-of-yield-return

来源：oschina

链接：https://my.oschina.net/u/4432649/blog/4321072