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...
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...
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...
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...
inqueryMajorCities) { Console.WriteLine(city); }// Output:// City { Name = Tokyo, Population = 37833000 }// City { Name = Delhi, Population = 30290000 }// Method-based syntaxIEnumerable<City> queryMajorCities2 = cities.Where(c => c.Population >30_000_000);// Execute the query to...
// 3. Query execution. foreach (int num in numQuery) { Console.Write("{0,1} ", num); } } } 下图演示完整的查询操作。 在 LINQ 中,查询的执行不同于查询本身。 换句话说,仅通过创建查询变量不会检索到任何数据。 using System; using System.Collections.Generic; ...
.ThenBy(x=>x.name).Select(x=>x.name+" came from "+x.fName);Thinking in query syntax正如...
Note that method syntax must be used here. var differenceQuery = names1.Except(names2); // Execute the query. Console.WriteLine("The following lines are in names1.txt but not names2.txt"); foreach (string s in differenceQuery) Console.WriteLine(s); /* Output: The following lines are...
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...