Asynctask < T> decoration and await are not used in synchronous methods to obtain asynchronous return values (asynchronous methods are called in synchronous methods)

In development , Our common asynchronous call is to add  async Task<T> , Specific calls are used on asynchronous methods var value = await funtion(), To get the value .

It is often written like this .

 public async Task<IActionResult> Index()
        {

            var client = new HttpClient(new HttpClientHandler
            {
                CookieContainer = new CookieContainer(),
                UseCookies = true
            });

            var str = await client.GetStringAsync("youUrl");
            
            return Content(str);
        }

But sometimes , Method Index Methods can only be synchronized , How should I call it ？ It's very simple , Just add .Result That's all right. .

 public IActionResult Index()
        {

            var client = new HttpClient(new HttpClientHandler
            {
                CookieContainer = new CookieContainer(),
                UseCookies = true
            });

            var str =  client.GetStringAsync("youUrl").Result;
            
            return Content(str);
        }

Call asynchronous method in synchronous method （ No return value ） reference ：C# Call asynchronous method in synchronous method   This blog

 static void Main(string[] args)
        {

           
                 TestAsync().Wait();
          
        }