usr/local/share/dotnet/sdk"; var fileList = Directory.GetFiles(startFolder, "*.*", SearchOption.AllDirectories); var fileQuery = from file in fileList let fileLen = new FileInfo(file).Length where fileLen > 0 s
The query in the previous example returns all the even numbers from the integer array. The query expression contains three clauses:from,where, andselect. (If you're familiar with SQL, you noticed that the ordering of the clauses is reversed from the order in SQL.) Thefromclause specifies ...
//1.创建compiled query NorthwindDataContext db = new NorthwindDataContext(); var fn = CompiledQuery.Compile( (NorthwindDataContext db2, string city) => from c in db2.Customers where c.City == city select c); //2.查询城市为London的消费者,用LonCusts集合表示,这时可以用数据控件绑定 var LonCu...
Dynamic conditions: How to achieve multiple "OR" conditions with LINQ? 發行項 2009/06/21 This question came up from Teresa B. a while back: === I am trying to split a string to come up with multiple where statements that are OR’d together. [...] I get res...
http://www.thereforesystems.com/linq-to-sql-join-on-multiple-conditions/Friday, May 20, 2011 9:45 AMI don't think you understand what I'm trying to do. I only need to join if a condition is met,复制 if (userInterestId > 0) { query = query.Join(objectContext.UserHealthInterest...
return query; } The temporary variable in the loop is required to avoid the outer variable trap, where the same variable is captured for each iteration of theforeach loop. So far, so good. But this only handles the case where you want to matchall of the specified keywords. Suppose instea...
To further refine the query, you can combine multiple Boolean conditions in thewhereclause. The following code adds a condition so that the query returns those students whose first score was over 90 and whose last score was less than 80. Thewhereclause should resemble the following code. ...
Each where clause can only contain conditions against a single entity type. A composite condition involving multiple entities is not valid. Instead, each entity should be filtered in separate where clauses. C# Copy from a in context.AccountSet where (a.Name.StartsWith("Contoso") && a....
You can add conditions to the Where property to filter the data records that are returned from a query. If the Where property is not set, the LinqDataSource control retrieves every record from the data object.Ordering DataYou use the OrderBy property to specify the names of properties from...
C# LINQ multiple joinsWe can join multiple data sources with multiple join operations. Program.cs List<Employee> employees = [ new (1, "John", "Doe"), new (2, "Paul", "Smith"), new (3, "Roger", "Roe") ]; List<Order> orders = [ new (1, 1, 1, 1, 1), new (2, 1, ...