C# 委托進階使用

資料源于劉鐵猛的C#視訊教程

紅色是主線程，其它三種是三個方法。

右邊三個圖分别是同步調用，異步，異步調用的示意圖。

1 單點傳播委托

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            action1.Invoke();
            action2.Invoke();
            action3.Invoke();
        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

2 多點傳播委托

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            //action1.Invoke();
            //action2.Invoke();
            //action3.Invoke();
            action1 += action2;
            action1 += action3;

            action1.Invoke();
        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

3 同步直接調用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            //第一種 同步直 接調用
            stu1.DoHomework();
            stu2.DoHomework();
            stu3.DoHomework();

            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(1000);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

4 同步單點傳播委托間接調用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            //第一種 同步 間接調用
            action1.Invoke();
            action2.Invoke();
            action3.Invoke();

            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(1000);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

5 同步多點傳播委托間接調用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            //第一種 同步 多點傳播委托間接調用
            action1 += action2;
            action1 += action3;
            

            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(1000);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

6 委托隐式異步調用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Action action1 = new Action(stu1.DoHomework);
            Action action2 = new Action(stu2.DoHomework);
            Action action3 = new Action(stu3.DoHomework);

            //異步 委托間接調用
            action1.BeginInvoke(null, null);
            action2.BeginInvoke(null, null);
            action3.BeginInvoke(null, null);


            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(1000);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

7 顯式異步調用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Thread thread1 = new Thread(new ThreadStart(stu1.DoHomework));
            Thread thread2 = new Thread(new ThreadStart(stu2.DoHomework));
            Thread thread3 = new Thread(new ThreadStart(stu3.DoHomework));

            thread1.Start();
            thread2.Start();
            thread3.Start();


            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(500);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

8 task異步線程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Del
{
    public delegate double Calc(double x, double y);//委托是類申明時與類平級

    class Program
    {
        static void Main(string[] args)
        {
            Student stu1 = new Student(){ ID = 1, PenColor = ConsoleColor.Yellow};
            Student stu2 = new Student(){ ID = 2, PenColor = ConsoleColor.Green};
            Student stu3 = new Student() { ID = 3, PenColor = ConsoleColor.Red };

            Task task1 = new Task(new Action(stu1.DoHomework));
            Task task2 = new Task(new Action(stu2.DoHomework));
            Task task3 = new Task(new Action(stu3.DoHomework));

            task1.Start();
            task2.Start();
            task3.Start();

            for (int i = 0; i < 10; i++)
            {
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Thread {0}", i);
                Thread.Sleep(500);
            }

        }
    }

    class Student
    {
        public int ID { get; set; }
        public ConsoleColor PenColor { get; set; }
        public  void DoHomework()
        {
            for (int i = 0; i < 5; i++)
            {
                Console.ForegroundColor = this.PenColor;
                Console.WriteLine("Student {0} doing homework {1} hours.", this.ID, i);
                Thread.Sleep(1000);
            }
        }
    }
}

C# 委托進階使用

繼續閱讀

CSU 1565 Word Cloud

CSU 1563 Lexicography

UVA 110 Meta-Loopless Sorts

HDU 4723 How Long Do You Have to Draw

HDU 1402 A * B Problem Plus

UVA 348 Optimal Array Multiplication Sequence

HDU 6232 Confliction

UESTC 1269 ZhangYu Speech

ZOJ 1041 Transmitters

CSU 1562 Fun House

HDU 5923 Prediction

CodeForces 21B Intersection

HDU 5344 MZL's xor

UVA 590 Always on the run

ZOJ 1104 Leaps Tall Buildings

HDU 2821 Pusher