使用async和await将同步方法包装成异步方法

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使用c#5.0引入的async和await，可以更简单的进行异步编程。本文使用async和await将同步方法包装成异步方法。

using System;
using System.Threading.Tasks;

namespace YlBCL
{
    public class AsyncHelper
    {
        public static async void RunAsync(Action action, Action callback)
        {
            await Task.Run(() => { action(); });
            if (callback != null) callback();
        }

        public static async void RunAsync<TResult>(Func<TResult> function, Action<TResult> callback)
        {
            TResult tResult = await Task.Run(() => { return function(); });
            if (callback != null) callback(tResult);
        }
    }
}

下面是使用AsyncHelper类的示例代码。

 Action action = new Action(() =>
{
     int s = 0;
     for (int i = 1; i < 10000; i++)
     {
          s = i;
     }
});

Action callback = new Action(() =>
{
      Console.WriteLine("success");
});
AsyncHelper.RunAsync(action , callback);

Func<string> action = new Func<string>(() => {
    int s = 0;
    for (int i = 1; i < 10000; i++)
    {
          s = i;
    }
    return s.ToString();
});
Action<string> callback = new Action<string>((s) =>
{
      Console.WriteLine(s);
 });
AsyncHelper.RunAsync(action , callback);

传入的Action实例也可以是满足委托定义的方法。