c# 异步 async await

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 

 class Program
    {
        public static async Task Main(string[] args)
        {
            var result = await Save();
            Console.WriteLine(result);
            Console.ReadLine();
        
        }

        public static async Task<string> Save()
        {
            var wc = new WebClient();
            var result = await wc.DownloadStringTaskAsync("https://www.baidu.com/");
            await Task.Run(() =>
            {
                File.WriteAllText("D:/reuslt.txt", result);
            });
            return "Success write";

        }

    }

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