usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;classProgram{staticvoidMain(string[]args){List<int>intList=newList<int>{1,2,3,4,5};string[]stringArray=intList.Select(x=>x.ToString()).ToArray();foreach(stringsinstringArray){Console.WriteLine(s);}}} 在这个示例中,我们首先创...
我用的是和Linq to Entities List<Person> per = new List<Person>(); paramObjects = new List(); List<string> fields = new <em 浏览1提问于2013-03-07得票数 1 回答已采纳 2回答 使用LINQ连接List<List<string>>中的所有字符串 、、 我的问题与这个List<List<List...<string>> ( n维...
List<string> listInt = new List<string>(); //List<T>类实现了IEnumerable<T>接口,因此它也可以使用IEnumerable<T>的扩展方法 listInt.Add("你好"); listInt.Add("吗"); listInt.Add("我爱你"); listInt.Add("真的好想家了"); listInt.Add("哎"); IEnumerable<string> stringArr = listInt.O...
List<string> loverlist = lovers.Split(',').ToList();//根据用户输入爱好 ,号来划分字符串varlist =fromfinplist//数据源也是一个集合:使用复合子句把数据源集合变成一个一个的字符串fromloveriteminf.loverwhereloverlist.Contains(loveritem)//查询条件是一个集合selectf; Show(list.ToList());//显示数据...
using System; using System.Collections.Generic; using System.Linq; namespace ConsoleApp { class Program { static void Main(string[] args) { string[] change = { "积善之家", "必有余庆" }; List<string> contents = change.ToList(); ...
例一:(本例适用于Linq to Object 和 没有建主外键的EF查询) 点标记中的Join需要传四个参数表达式,是不是有点晕了。。。 varlist1 =newDictionary<string,string> { {"1","张三"}, {"2","李四"}, {"3","张三"}, {"4","张三"} };varlist2 =newDic...
(IEnumerable<string> query,stringmessage){ Console.WriteLine(Environment.NewLine + message);foreach(stringiteminquery) { Console.WriteLine(item); } Console.WriteLine($"{query.Count()}total names in list"); }/* Output: Simple concatenate and sort. Duplicates are preserved: Aw, Kam Foo ...
stringstartFolder ="""C:\Program Files\dotnet\sdk""";// Or// string startFolder = "/usr/local/share/dotnet/sdk";DirectoryInfo dir =newDirectoryInfo(startFolder);varfileList = dir.GetFiles("*.*", SearchOption.AllDirectories);stringsearchTerm ="change";varqueryMatchingFiles =fromfi...
record City(string Name, long Population); record Country(string Name, double Area, long Population, List<City> Cities); record Product(string Name, string Category); C# 复制 static readonly City[] cities = [ new City("Tokyo", 37_833_000), new City("Delhi", 30_290_000), new City...
LINQ之String LINQ to SQL支持以下String方法。但是不同的是默认情况下System.String 方法区分大小写。而SQL则不区分大小写。 1.字符串串联(String Concatenation) AI检测代码解析 var q = from c in db.Customers select new { c.CustomerID, Location = c.City + ", " + c.Country...