How to implement synchronization and asynchrony in C#

The following is a code example of synchronous and asynchronous implementation using C#: 1. Synchronous and asynchronous implementation using threads

Synchronous example:


using System;
using System.Threading;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("开始执行同步操作...");

        DoWork();

        Console.WriteLine("开始执行其他操作...");

        Console.ReadKey();
    }

    static void DoWork()
    {
        Console.WriteLine("同步操作开始...");

        Thread.Sleep(5000);

        Console.WriteLine("同步操作结束...");
    }
}

Asynchronous example:


using System;
using System.Threading;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("开始执行异步操作...");

        Thread thread = new Thread(DoWork);
        thread.Start();

        Console.WriteLine("开始执行其他操作...");

        Console.ReadKey();
    }

    static void DoWork()
    {
        Console.WriteLine("异步操作开始...");

        Thread.Sleep(5000);

        Console.WriteLine("异步操作结束...");
    }
}

2. Use Task and async/await to achieve asynchrony

Asynchronous example:

using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        Console.WriteLine("开始执行异步操作...");

        await DoWorkAsync();

        Console.WriteLine("开始执行其他操作...");

        Console.ReadKey();
    }

    static async Task DoWorkAsync()
    {
        Console.WriteLine("异步操作开始...");

        await Task.Delay(5000);

        Console.WriteLine("异步操作结束...");
    }
}

3. Use delegates and callback functions to achieve asynchrony

Asynchronous example:


using System;
using System.Threading;

class Program
{
    delegate void Callback();

    static void Main(string[] args)
    {
        Console.WriteLine("开始执行异步操作...");

        Callback callback = DoWork;
        IAsyncResult result = callback.BeginInvoke(null, null);

        Console.WriteLine("开始执行其他操作...");

        callback.EndInvoke(result);

        Console.ReadKey();
    }

    static void DoWork()
    {
        Console.WriteLine("异步操作开始...");

        Thread.Sleep(5000);

        Console.WriteLine("异步操作结束...");
    }
}

4. Using events to achieve asynchrony

Asynchronous example:


using System;
using System.Threading;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("开始执行异步操作...");

        Worker worker = new Worker();
        worker.Completed += Worker_Completed;
        worker.DoWorkAsync();

        Console.WriteLine("开始执行其他操作...");

        Console.ReadKey();
    }

    static void Worker_Completed(object sender, EventArgs e)
    {
        Console.WriteLine("异步操作结束...");
    }
}

class Worker
{
    public event EventHandler Completed;

    public void DoWorkAsync()
    {
        Thread thread = new Thread(DoWork);
        thread.Start();
    }

    void DoWork()
    {
        Console.WriteLine("异步操作开始...");

        Thread.Sleep(5000);

        Completed(this, EventArgs.Empty);
    }
}

The above are several ways to implement synchronous and asynchronous using C#, and you need to choose the appropriate method according to the specific situation.

How to implement synchronization and asynchrony in C#

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