In general, we recommend query syntax because it is usually simpler and more readable; however there is no semantic difference between method syntax and query syntax. In addition, some queries, such as those that retrieve the number of elements that match a specified condition, or that retrieve...
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...
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 +" ")...
下列範例顯示簡單的「查詢運算式」(Query Expression),以及在語意上相等,以「方法架構查詢」(Method-Based Query) 撰寫的對等查詢。 C# 複製 class QueryVMethodSyntax { static void Main() { int[] numbers = { 5, 10, 8, 3, 6, 12}; //Query syntax: IEnumerable<int> numQuery1 = from num in...
Query vs. Method Syntax in LINQ There are two different types of syntax that you can use to query with LINQ: query syntax and method syntax. In the code samples both types are used, as one becomes familiar with with writing queries one style lends itself better than the other. G...
Some query operations, such asCountorMax, have no equivalent query expression clause and must therefore be expressed as a method call. Method syntax can be combined with query syntax in various ways. Query expressions can be compiled to expression trees or to delegates, depending on the type th...
classPet{publicstringName {get;set; }publicintAge {get;set; } }// Uses method-based query syntax.publicstaticvoidGroupByEx1(){// Create a list of pets.List<Pet> pets =newList<Pet>{newPet { Name="Barley", Age=8},newPet { Name="Boots", Age=4},newPet { Name="Whiskers", Age=1...
To use method syntax in a query expression As described inQuery Syntax and Method Syntax in LINQ (C#), some query operations can only be expressed by using method syntax. The following code calculates the total score for each Student in the source sequence, and then calls theAverage()metho...
- Query Syntax- Method Syntax*//* Query syntax:- Uses the declarative form to invoke the LINQ Operators- Similar to an SQL statement*//* Method syntax:- Invokes the LINQ operators using methods*/[TestMethod]publicvoidFindItemWithLinqQuerySyntax(){varprogrammingLanguages=ProgrammingLanguageRepository...
Where Method Zip(TFirst, TSecond, TResult) Method EnumerableExecutor Class EnumerableExecutor(T) Class EnumerableQuery Class EnumerableQuery(T) Class IGrouping(TKey, TElement) Interface ILookup(TKey, TElement) Interface IOrderedEnumerable(TElement) Interface ...