本文內容 Convert a foreach loop to LINQ refactoring 另請參閱 This refactoring applies to: C# What: Lets you easily convert your foreach loop that uses an IEnumerable to a LINQ query or a LINQ call form (also known as a LINQ method). When: You have a foreach loop that uses an ...
易于理解的代码。但是LINQ慢于foreach。要获得更多信息，请阅读文章LINQ vs FOREACH vs FOR Loop Perfor...
LINQ is also calling foreach to loop, it is a extention method with IEnumerable type which records in memory.If you are doing LINQ to SQL or Entity Framework, the LINQ query will be translate to T-SQL, so the performance is good.
问使用LINQ从列表还是foreach循环中获取行的速度更快ENApache 2.0在性能上的改善最吸引人.在支持POSIX...
List<int> numbers = [1,2,4,6,8,10,12,14,16,18,20]; IEnumerable<int> queryFactorsOfFour =fromnuminnumberswherenum %4==0selectnum;// Store the results in a new variable// without executing a foreach loop.varfactorsofFourList = queryFactorsOfFour.ToList();// Read and write from ...
用LINQ查询替换foreach 作为一个云计算领域的专家,我可以告诉你,LINQ(Language Integrated Query)是一种查询语言,它允许开发者使用类似于SQL的语法来查询和操作数据。在C#和Visual Basic中,LINQ提供了一种更加简洁、更加强大的方式来处理数据,而不是使用传统的循环(如foreach)。 LINQ的优势在于它可以将查询和数据操作...
// Note the extra foreach loop here. foreach (IEnumerable<String> collection in query1) foreach (string item in collection) Console.WriteLine(item); Console.WriteLine("\nResults by using SelectMany():"); foreach (string item in query2) ...
LINQ 是后运行的,也就是说一般上当我们写好语句,在还没有调用result时(比如 toJson | foreach ), 他是不会执行的,一直等到我们调用才运行,当然凡事总有另外 ! 下面就是一些会让语句直接执行的情况 int[] numbers = {10,9,8,7,6};intfirstNumber = numbers.First();//10intlastNumber = numbers.Last...
Linq.IQueryable<AnonymousType#1>' does not contain a definition for 'Concat' and the best extension method overload ' Save multiple parent child record in foreach loop (Multiple added entities may have the same primary key.) Save value type Decimal from VB.Net to SQL Server DB SaveChanges(...
// Note the extra foreach loop here. foreach (IEnumerable<String> collection in query1) foreach (string item in collection) Console.WriteLine(item); Console.WriteLine("\nResults by using SelectMany():"); foreach (string item in query2) ...