Nettet15. jul. 2010 · 2 Answers. You should try to avoid using the Count () method as a way to check whether a sequence is empty or not. Phil Haack has an excellent article on his blog where he discusses this antipattern. Count () must actually enumerate all elements of the sequence - which may be expensive if the sequence is based on multiple LINQ … Nettet14. mar. 2024 · 扩展方法（Extension Methods）是C#3.0时引入的新特性，相信很多人都听过并且也都用过，最常见的是在LINQ中的使用。 不仅如此，在开发中，我们也可以创 …
List .ForEach(Action ) Method (System.Collections.Generic)
NettetC# SQL数据库中大量记录的Linq查询和Foreach,c#,entity-framework,linq,C#,Entity Framework,Linq,我正在使用实体框架和Linq。我需要对我的对象的两个属性进行查询 我在数据库中有这个对象，大约有200000条记录： public class DeviceState { public int ID { get; set; } public DateTime TimeStamp ... budget direct monthly car insurance
C# Tip: SelectMany in LINQ & Code4IT
NettetWith a LINQ query, you can extremely shorten the required code to this: return users.Select(u => u.Name).ToList(); Once you understand and can utilize LINQ queries, I guarantee you, that your code will gain much more readability. An overview of available extension methods for LINQ can be found here. Extract Methods and Provide … Nettet22. sep. 2015 · 1. I haven't tried it but you should be able to use LINQ to XML and simply get all CONDITION nodes, something along these lines XDocument.Load (new … Nettet1. jul. 2010 · It looks like LINQ might be faster than for each loop. Here are the results I got: Exists = True Time = 174 Exists = True Time = 149. It would be interesting if some … budget direct money manager