// Return the FileInfo object for the largest file // by sorting and selecting from beginning of list FileInfo longestFile = (from file in fileList let fileInfo = new FileInfo(file) where fileInfo.Length > 0 orderby fileInfo.Length descending select fileInfo ).First(); Cons...
string[] fileA = File.ReadAllLines("names1.txt");string[] fileB = File.ReadAllLines("names2.txt");// Concatenate and remove duplicate namesvarmergeQuery = fileA.Union(fileB);// Group the names by the first letter in the last name.vargroupQuery =fromnameinmergeQueryletn =...
// Create an empty array.int[] numbers = { };// Get the first item in the array, or else the// default value for type int (0).intfirst = numbers.AsQueryable().FirstOrDefault(); Console.WriteLine(first);/* This code produces the following output: 0 */ ...
list.OrderBy(_=>rd.Next(1,99)).First();//随机排序通用方法//就是从原List中每次随机取一项,添加到新的List中,并在原List中删除。这样重复,直到原List为空为止。//不过要注意,如果要保护原List不受变化,就必须先Copy一份List,再在Copy上进行操作publicstaticList<T> GetRandomList<T>(List<T>inputList...
模糊查询并遍历·这里用到的是字符串的【Contains】函数,ToList()返回一个列表。 代码语言:javascript 复制 List<Users>list=init();varlinq=(from iteminlist where item.userName.Contains("龙")select item).ToList();foreach(variteminlinq){Console.WriteLine(item.id);Console.WriteLine(item.userName);Con...
// Create an empty array.int[] numbers = { };// Get the first item in the array, or else the// default value for type int (0).intfirst = numbers.AsQueryable().FirstOrDefault(); Console.WriteLine(first);/* This code produces the following output: 0 */ ...
(var catno in CategoryNoList) { var ProdList = (from ProdRec in list where ProdRec.CatName == "name 1" && ProdRec.CatNo == catno select ProdRec).First(); prod.Add(ProdList); } foreach (var item in prod) { Response.Write(item.CatName + " " + item.CatNo +""); } ...
usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;classStudent{publicstringFirstName {get;set; }publicstringLastName {get;set; }publicintID {get;set; }publicList<int> ExamScores {get;set; } }classPopulateCollection{staticvoidMain(){// These data f...
Select Returns list of selected value Delegate Distinct Returns grouped selected value. Delegate First Returns first item in list. Last Returns last item in list. Range (static) Creates list of numbers, within a specified range. start, length Add Adds element to list. item AddRange Adds each ...