什么是“用单个调用替换为单个"?意思是? [英] What does "Replace with single call to single" mean?

问题描述

在将LINQ与Single()一起使用时，我的代码行始终以绿色下划线显示，并建议用单次调用替换为Single".这是什么意思?这是产生该建议的一行代码的示例:

When using LINQ with Single() I always get my line of code underlined in green with the suggestion "Replace with single call to single." What does this mean? Here's an example of a line of code that results in that suggestion:

var user = db.Users.Where(u => u.UserID == userID).Single();

如您所见，我只使用Single()一次.那...怎么了?

As you can see I'm only using Single() once. So... what's the deal?

推荐答案

我认为这意味着使用 Single 的重载，它使用谓词而不是同时使用Where和Single:

I assume it means, use the overload of Single which takes a predicate instead of using Where and Single together:

var user = db.Users.Single(u => u.UserID == userID);

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