WebJun 6, 2009 · 我一直在寻找Select和SelectMany ... c#/ entity-framework/ entity-framework-core/ iqueryable. 5 在知道每个Select / SelectMany结果的同时在Linq中转换序列 这是我的问题。 我有一个特定的列表,为了简单起见,我将它作为int[]呈现。 假设我需要转换此列表中的每个项目,但根据情况 ... WebMay 21, 2024 · LINQ Projection Operator SelectMany. In LINQ, projection is an operation which converts an object into the new form which holds only those properties which will be subsequently used. By using projection, a developer can create a new type which is built from each object. You are allowed to project property and conduct …
SelectMany的應用 - iT 邦幫忙::一起幫忙解決難題,拯救 IT 人的一天
Web一:SelectMany. 这个方法绝对是提高开发速度的一大利器,有太多的业务场景需要使用这个函数,举一个我实际应用场景,商家按照年份和客户类型预先设置一些标签,然后让系统跑一下它的各自标签到底有多少人?. 1. 定义Model. 为了方便演示,这里做了一下简化 ... WebFeb 7, 2024 · SelectMany flattens a returned list of lists, but as you only return a list, there is no need for it (and you can't even use it).. It would come handy, if the Role class would contain a list of UserIds:. public List UserId { get; set; } Then the followind code would help you: positions = positions .Where(x => x.Roles.SelectMany(y => … cinch carlisle
C# Lambda表达式select()和where()的区别 - sunny123456 - 博客园
WebOct 23, 2024 · 因此,以上将会输出以下结果:. 实际以上的SelectMany对应的LINQ语句为:. var dogs = from p in personList from d in p.Dogs select d; 我们可以将其代替试试就知 …WebJun 23, 2024 · The following is our string array.string[] str = { Mobile, Laptop, Tablet };Now, convert to character array.str.SelectMany(item => item.ToCharArray());Exa Home … WebSep 5, 2024 · [C#] LINQ之SelectMany和GroupJoin. ... list var result01 = from p in persons join c in cities on p.CityID equals c.ID into cs select new ... Console.WriteLine(); } Console.WriteLine(); // 例子4(和例子2是同样的效果):左连 lamda 返回的Citys是list var result2 = persons.GroupJoin ... cinch carnext