调用 HttpClient GetAsync 但应用程序冻结秒并作为同步模式工作

Question

Below is my code to get an HTML page

  public static async Task<string> GetUrltoHtml(string url)

    {
        string s;
        using (var client = new HttpClient())
        {

            var result = client.GetAsync(url).Result;
            //Console.WriteLine("!!!"+result.StatusCode);
            s = result.Content.ReadAsStringAsync().Result; //break point


        }
        return s;
    }

the line

var result = client.GetAsync(url).Result;

causes app freeze seconds and work as sync mode

Your comment welcome

Answer 1

According to the docs

Accessing the property's get accessor blocks the calling thread until the asynchronous operation is complete; it is equivalent to calling the Wait method.

So getting Result is a blocking action. You should use await instead.

s = await result.Content.ReadAsStringAsync();

( Result is helpful when the result is ready and you just want to get it. Or in some cases you want to block the thread (but it's not recommended).)