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Oct 3, 2008 · 290. Lambda expressions are a simpler syntax for anonymous delegates and can be used everywhere an anonymous delegate can be used. However, the opposite is not true; lambda expressions can be converted to expression trees which allows for a lot of the magic like LINQ to SQL. The following is an example of a LINQ to Objects expression using ...
Mar 19, 2010 · The lambda expression for one object to get the key is (i => i.name). For the other, it's (i => i.inner.name). In the second one, i.name doesn't exist. i.inner.name ALWAYS exists if i.name doesn't. Is there a lambda expression I can use to combine these two? Basically to read as: "if i.name exists then set id to i.name, else set id to i.inner ...
Async lambda, like an async method, is a way for you to write such methods. If someone calls your async method or lambda, it will execute the code you wrote and the Task it returns will be set completed when the code is finished. Presumably, if someone asks you for such a method, they intend to call it and await.
FirstName = u.FirstName, LastName = u.LastName, IsGeek = await _userManager.IsInRoleAsync(u.Id, "Geek") }); When you Select with an async lambda, the result is a sequence of tasks. So, to (asynchronously) wait for all those tasks to complete, use Task.WhenAll: var result = await Task.WhenAll(users); return Ok(result); answered Nov 29, 2014 at ...
Apr 3, 2012 · Lambda expressions are a shorthand for the DoStuff(PrintString) so you don't have to create a method for every delegate variable you're going to use. You 'create' a temporary method that's passed on to the method. It works like this: DoStuff(string text => Console.WriteLine(text)); // single line.
I'm starting to love Lambda expressions but I'm struggling to pass this wall: public class CompanyWithEmployees { public CompanyWithEmployees() { } public Company CompanyInfo { get; set; }...
c# lambda expression if condition inside a where. 4. Stacking where conditions with Lambda expressions. 0. ...
Mar 2, 2016 · The point I'm making is that this command should generate SQL (i.e., OP is using EF). The query generated should be "SELECT ... WHERE FavoriteSport = "Baseball" AND FavoriteColor IN ( Red", "Blue", "Green"). It would have to iterate through the entire collection to generate the IN statement. – Derek Van Cuyk.
This can be done as. list.Sort( (emp1,emp2)=>emp1.FirstName.CompareTo(emp2.FirstName) ); The .NET framework is casting the lambda (emp1,emp2)=>int as a Comparer<Employee>. This has the advantage of being strongly typed. If you need the descending/reverse order invert the parameters.
In the example in this illustration, the g.id part of the original select statement JOIN gStatus g on g.id is not replicated in the final Lambda expression. – SausageFingers Commented Mar 13, 2018 at 18:03
