如何从 C# 中的第 3 方应用程序同步调用 web api？

Question

我已经使用 HTTP 客户端编写了一个代码来从 Web API 访问令牌，现在当我尝试从外部应用程序调用该方法时，异步方法被调用，但下面的代码没有被执行。

response = await client.PostAsync(client.BaseAddress, requestParams).ConfigureAwait(false);  

有没有办法让我们把它变成同步方法，这样我就可以从外部应用程序访问它？

下面是代码

    ServicePointManager.Expect100Continue = true;    
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;                    
    client.BaseAddress = new Uri("url");     
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));  
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic","value");
    HttpResponseMessage response = new HttpResponseMessage();
    List<KeyValuePair<string, string>> allIputParams = new List<KeyValuePair<string, string>>();
    allIputParams.Add(new KeyValuePair<string, string>("granttype", "value"));
    HttpContent requestParams = new FormUrlEncodedContent(allIputParams);
        
    --the code gets execute till here .
    --it is not getting called the below lines.
    response = await client.PostAsync(client.BaseAddress,requestParams).ConfigureAwait(false);