LINQ Method Syntax //string collectionIList<string> stringList =newList<string>() {"C# Tutorials","VB.NET Tutorials","Learn C++","MVC Tutorials","Java"};//LINQ Query Syntaxvarresult = stringList.Where(s => s.Contains("Tutorials")); //Student collectionIList<Student> studentList =newList...
查询语句方式:(Query Syntax)一种更接近SQL语法的查询方式,可读性更好。 原理浅析 编辑 LINQ(Language Integrated Query)是Visual Studio 2008中的领军人物。借助于LINQ技术,我们可以使用一种类似SQL的语法来查询任何形式的数据。目前为止LINQ所支持的数据源有SQL Server、Oracle、XML(标准通用标记语言下的一个应用)以...
int[] numbers = [5,10,8,3,6,12];//Query syntax:IEnumerable<int> numQuery1 =fromnuminnumberswherenum %2==0orderbynumselectnum;//Method syntax:IEnumerable<int> numQuery2 = numbers .Where(num => num %2==0) .OrderBy(n => n);foreach(intiinnumQuery1) { Console.Write(i +" ")...
上面的第一种方法叫查询语法(query syntax),看上去和SQL的语句很相似。查询语法使用查询表达式书写。第二种方法叫方法语法(method syntax)是命令形式,它使用的是标准的方法调用,方法是一组叫做标准查询运算符的方法。虽然形式上这两种查询方法不同,事实上这两种方法存在着紧密的联系,在CLR内只识别查询方法,因此在每次...
//语言集成查询/Query Syntax var query = from r in students where r.score < 60 orderby r.score select r; //链式方法查询/Method Syntax var query2= students.Where(r => r.score < 60).OrderBy(r => r.score).Select(r => r); //上面两种linq查询语法是等价的 LINQ(Language Integrated...
int[] numbers = [ 5, 10, 8, 3, 6, 12 ]; //Query syntax: IEnumerable<int> numQuery1 = from num in numbers where num % 2 == 0 orderby num select num; //Method syntax: IEnumerable<int> numQuery2 = numbers .Where(num => num % 2 == 0) .OrderBy(n => n); foreach (in...
int[] numbers = [5,10,8,3,6,12];//Query syntax:IEnumerable<int> numQuery1 =fromnuminnumberswherenum %2==0orderbynumselectnum;//Method syntax:IEnumerable<int> numQuery2 = numbers .Where(num => num %2==0) .OrderBy(n => n);foreach(intiinnumQuery1) { Console.Write(i +" ")...
语法分析(Syntax Analysis):根据编程语言的语法规则,将词法单元组合成表达式树的节点。语法分析器根据语法规则进行递归下降或其他算法来构建表达式树的节点结构。语义分析(Semantic Analysis):在构建表达式树的过程中进行语义检查,例如类型检查、变量声明检查等。语义分析器确保表达式树的构建是符合编程语言的语义规则的...
Queries can also be expressed by using method syntax. For more information, see Query Syntax and Method Syntax in LINQ. Classification of standard query operators by manner of execution The LINQ to Objects implementations of the standard query operator methods execute in one of two main ways: imm...
var queryLondonCustomers3 = from cust in customers where cust.City == "London" orderby cust.Name ascending select cust; 要对结果进行从 Z 到 A 的逆序排序,请使用 orderby…descending 子句 分组(group) group 子句用于对根据您指定的键所获得的结果进行分组。 例如,可指定按 City 对结果进行分组,使来...