C#:带有POST参数的HttpClient

Question

我使用下面的代码向服务器发送POST请求:

string url = "http://myserver/method?param1=1&param2=2"    
HttpClientHandler handler = new HttpClientHandler();
HttpClient httpClient = new HttpClient(handler);
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, url);
HttpResponseMessage response = await httpClient.SendAsync(request);

我没有访问服务器进行调试,但我想知道,这个请求是以POST还是GET发送的？

如果是GET,如何更改我的代码以将param1和param2作为POST数据发送(不在URL中)？

Answer 1

更清洁的替代方案是使用a Dictionary来处理参数.毕竟它们是键值对.

private static readonly HttpClient httpclient;

static MyClassName()
{
    // HttpClient is intended to be instantiated once and re-used throughout the life of an application. 
    // Instantiating an HttpClient class for every request will exhaust the number of sockets available under heavy loads. 
    // This will result in SocketException errors.
    // https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclient?view=netframework-4.7.1
    httpclient = new HttpClient();    
} 

var url = "http://myserver/method";
var parameters = new Dictionary<string, string> { { "param1", "1" }, { "param2", "2" } };
var encodedContent = new FormUrlEncodedContent (parameters);

var response = await httpclient.PostAsync (url, encodedContent).ConfigureAwait (false);
if (response.StatusCode == HttpStatusCode.OK) {
    // Do something with response. Example get content:
    // var responseContent = await response.Content.ReadAsStringAsync ().ConfigureAwait (false);
}

Dispose()如果你不使用关键字,也不要忘记HttpClientusing

正如Microsoft文档中 HttpClient类的备注部分所述,HttpClient应该被实例化一次并重新使用.

编辑:

你可能想要研究response.EnsureSuccessStatusCode();而不是if (response.StatusCode == HttpStatusCode.OK).

你可能想保留你的HttpClient而不是Dispose()它.请参阅:HttpClient和HttpClientHandler是否必须处理？