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在C#中使用异步 async await

1.如果您的vs中显示 Main 方法报错,请在项目设置中将您的C#版本改为默认最新或直接选择C#7.0 

 1  class Program
 2     {
 3         public static async Task Main(string[] args)
 4         {
 5             var result = await Save();
 6             Console.WriteLine(result);
 7             Console.ReadLine();
 8         
 9         }
10 
11         public static async Task<string> Save()
12         {
13             var wc = new WebClient();
14             var result = await wc.DownloadStringTaskAsync("https://www.baidu.com/");
15             await Task.Run(() =>
16             {
17                 File.WriteAllText("D:/reuslt.txt", result);
18             });
19             return "Success write";
20 
21         }
22 
23     }

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