Deligate method chaining

Question

If we assume method chaining to Deligate in a single thread environment, is the execution order guaranteed by all means?

Answer 1

if you are referring the delegate multicast, a multicast delegate has a list. the list is the order added, and the callbacks are called in list order. if the delegate has a return type, the return value of invoking the delegate is the value of the last call.

if the delegate code is async (returns a Task), there is no await, so the callback can complete in a random order. but they are invoked in order.

Answer 2

Hi @윤수 장 , Welcome to Microsoft Q&A,

In a single-threaded environment, when methods are linked to a delegate and executed, the order of execution is guaranteed. A delegate is a type used in the .NET Framework to reference methods. It can contain references to one or more methods. When you call a delegate, the delegate executes the methods in the order they are added to the delegate. This order of execution is guaranteed even in a single-threaded environment. This is because the delegate internally maintains a list of methods and executes them in the order they are added.

For example, consider the following C# code:

using System;

class Program
{
     //Define a delegate
     delegate void MyDelegate();

     static void Main()
     {
         MyDelegate myDelegate = null;

         //Add method to delegate
         myDelegate += Method1;
         myDelegate += Method2;
         myDelegate += Method3;

         // Call the delegate and execute the methods in the order they were added.
         myDelegate();

         Console.ReadLine();
     }

     static void Method1()
     {
         Console.WriteLine("Method1");
     }

     static void Method2()
     {
         Console.WriteLine("Method2");
     }

     static void Method3()
     {
         Console.WriteLine("Method3");
     }
}

In this example, Method1, Method2, and Method3 are executed in the order in which they are added to the delegate. The order of execution is predictable and not affected by single-threaded environments.

Best Regards,

Jiale

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