Lambda表达式的捧场

本文介绍了Lambda表达式的捧场的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 public class CourseDetail { public CourseDetail(); public string CourseId { get; set; } public string CourseDescription { get; set; } public long CourseSer { get; set; } } public class RefUIDByCourse { public long CourseSer { get; set; } public double DeliveredDose{ get; set; } public double PlannedDose{ get; set; } public string RefUID { get; set; } } public class RefData { public double DailyDoseLimit { get; set; } public string RefName { get; set; } public string RefUID { get; set; } public double SessionDoseLimit { get; set; } } public class CourseSummary { public long CourseSer { get; set; } public double DeliveredDose{ get; set; } public double PlannedDose{ get; set; } Public List<RefData> lstRefData {get;set;} }

其一courseSer有可以在多个RefUID RefUIDByCourse 和每RefUID会有RefData一个记录

For one courseSer there can be multiple RefUID in RefUIDByCourse and for every RefUID there will be one record in RefData

我有CourseDetail，RefUIDByCourse和RefData 名单现在对于courseser在coursedetail存在我要创建CourseSummary列表。

的有一件事情我可以做的是循环做coursedetail并使用取各自refdata LINQ查询并创建coursesummary的对象，并在列表中添加它。的

的 ，但有什么办法一个LINQ做查询，而不是通过的

but is there any way to do it by one linq query instead of doing loop through

推荐答案

对于加入的拉姆达做循环是参与了一点 - 这里的一个简单的例子：

The lambda for a Join is a bit involved - here's a simple example:

List<Person> People = new List<Person>(); List<PersonType> PeopleTypes = new List<PersonType>(); var joined = People.Join(PeopleTypes, PeopleKey => PeopleKey.PersonType, PeopleTypesKey => PeopleTypesKey.TypeID, (Person, PersoneType) => new { Name = Person.Name, TypeID = PersoneType.TypeID });

我通常会发现查询语法很多比lambda表达式加盟

I usually find the query syntax a lot more readable than lambdas for joining

var joined2 = from p in People join pType in PeopleTypes on p.PersonType equals pType.TypeID where p.Name.StartsWith("whatever") select new { Name = p.Name, TypeID = pType.TypeID };