threading return values

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4.00/5 (1 vote)

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How do I thread a simple method and return its results?
For example, I have a class called Math, a single method that takes two ints as params and returns a int result. How do I thread this and get the result to be used later in the application?

Thread thread = new Thread(() => m.SumTest(5));
thread.Start();

C#

public class Maths
    {
        public int num1;
        public int num2;
        Random r = new Random();
        public void Divide()
        {
            for (int i = 0; i < 100000; i++)
            {
                num1 = r.Next(1, 2);
                num2 = r.Next(1, 2);
                int result = num1 / num2;
                Console.WriteLine(result);
                num1 = 0;
                num2 = 0;
            }

        }
        public int SumTest(int max)
        {
            int answer = 0;

            for (int i = 0; i < max; i++)
            {
                answer += i;
            }

            return answer;

        }

    }

Posted 30-Sep-13 18:56pm

Iman Mohtashemi

Updated 30-Sep-13 19:21pm

v2

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Comments

Thanks7872 1-Oct-13 1:14am

How do I thread this? What do you mean by thread here?

3 solutions

Solution 1

You can use AsyncCallback[^], which has a good example on how to use it.

Posted 30-Sep-13 18:59pm

Ron Beyer

Solution 3

when you call thread and start and join it

you use a call back method and operating system automatically return it

if you have set response time for threads.

Posted 30-Sep-13 22:46pm

Kamran Ayati

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Govindaraj Rangaraj · Accepted Answer · 2013-09-30T22:43:00

You can use Task in c# 4.0 for threading. Task take care of threading internally so it is safer than dealing with threads.

Example on how to work on your program using Task is:

C#

Task<int> t1 = Task<int>.Factory.StartNew(() => m.SumTest(5));
Task t2 = Task.Factory.StartNew(() => m.Divide());
Task.WaitAll(t1, t2);  //this will wait till t1 and t2 get finished.
var sumResult = t1.Result; //get the result of SumTest method like this.