delegate keyword vs. lambda notation
Once it is compiled, is there a difference between: delegate { x = 0; } and () => { x = 0 } ? 6 Answers 6
delegates
Java Delegates?
Does the Java language have delegate features, similar to how C# has support for delegates? 15 Answers 15
Unsubscribe anonymous method in C#
Is it possible to unsubscribe an anonymous method from an event? If I subscribe to an event like this: void MyMethod() { Console.WriteLine(“I did it!”); } MyEvent += MyMethod; I can un-subscribe like this: MyEvent -= MyMethod; But if I subscribe using an anonymous method: MyEvent += delegate(){Console.WriteLine(“I did it!”);}; is it possible to unsubscribe … Read more
What are the differences between delegates and events?
What are the differences between delegates and an events? Don’t both hold references to functions that can be executed? 11 Answers 11
When & why to use delegates? [duplicate]
This question already has answers here: Where do I use delegates? [closed] (8 answers) Closed 8 years ago. I’m relatively new in C#, & I’m wondering when to use Delegates appropriately. they are widely used in events declaration, but when should I use them in my own code and why are they useful? why not … Read more
How can I make a weak protocol reference in ‘pure’ Swift (without @objc)
weak references don’t seem to work in Swift unless a protocol is declared as @objc, which I don’t want in a pure Swift app. This code gives a compile error (weak cannot be applied to non-class type MyClassDelegate): class MyClass { weak var delegate: MyClassDelegate? } protocol MyClassDelegate { } I need to prefix the … Read more
How do I create delegates in Objective-C?
I know how delegates work, and I know how I can use them. But how do I create them? 19 s 19 An Objective-C delegate is an object that has been assigned to the delegate property another object. To create one, you define a class that implements the delegate methods you’re interested in, and mark … Read more
Func vs. Action vs. Predicate [duplicate]
This question already has answers here: Delegates: Predicate vs. Action vs. Func (8 answers) Closed 7 years ago. With real examples and their use, can someone please help me understand: When do we need a Func<T, ..> delegate? When do we need an Action<T> delegate? When do we need a Predicate<T> delegate? 3 s 3
Pass Method as Parameter using C#
I have several methods all with the same parameter types and return values but different names and blocks. I want to pass the name of the method to run to another method that will invoke the passed method. public int Method1(string) { // Do something return myInt; } public int Method2(string) { // Do something … Read more
Why would you use Expression rather than Func?
I understand lambdas and the Func and Action delegates. But expressions stump me. In what circumstances would you use an Expression<Func<T>> rather than a plain old Func<T>? 1Best Answer 11 When you want to treat lambda expressions as expression trees and look inside them instead of executing them. For example, LINQ to SQL gets the … Read more