Canonical 如何使用该 方法 发出HTTP请求并发送一些数据POST ?
POST
我可以GET提出请求,但是我不知道如何提出POST请求。
GET
有几种执行HTTP GET和POST请求的方法:
可用:.NET Framework 4.5+,.NET Standard 1.1+,.NET Core 1.0+。
.NET Framework 4.5+
.NET Standard 1.1+
.NET Core 1.0+
目前,它是首选方法,并且具有异步性和高性能。在大多数情况下,请使用内置版本,但对于非常旧的平台,则提供了NuGet软件包。
using System.Net.Http;
建议HttpClient在应用程序的生命周期中实例化一个实例,并共享它,除非您有特殊原因不这样做。
HttpClient
private static readonly HttpClient client = new HttpClient();
请参阅HttpClientFactory以获取依赖项注入解决方案。
HttpClientFactory
var values = new Dictionary<string, string>
{ { “thing1”, “hello” }, { “thing2”, “world” } };
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("http://www.example.com/recepticle.aspx”, content);
var responseString = await response.Content.ReadAsStringAsync();
var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");
RestSharp
var client = new RestClient("http://example.com");
// client.Authenticator = new HttpBasicAuthenticator(username, password); var request = new RestRequest(“resource/{id}”); request.AddParameter(“thing1”, “Hello”); request.AddParameter(“thing2”, “world”); request.AddHeader(“header”, “value”); request.AddFile(“file”, path); var response = client.Post(request); var content = response.Content; // Raw content as string var response2 = client.Post(request); var name = response2.Data.Name;
Flurl.Http
这是一个更新的库,具有流畅的API,测试助手,在后台使用HttpClient且可移植。可通过NuGet获得。
using Flurl.Http;
var responseString = await "http://www.example.com/recepticle.aspx" .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" }) .ReceiveString();
var responseString = await "http://www.example.com/recepticle.aspx" .GetStringAsync();
可用:.NET Framework 1.1+,.NET Standard 2.0+,.NET Core 1.0+。在.NET Core中,它主要是为了兼容性-它可以包装HttpClient,性能较低且不会获得新功能。
.NET Framework 1.1+
.NET Standard 2.0+
using System.Net; using System.Text; // For class Encoding using System.IO; // For StreamReader
var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");
var postData = “thing1=” + Uri.EscapeDataString(“hello”); postData += “&thing2=” + Uri.EscapeDataString(“world”); var data = Encoding.ASCII.GetBytes(postData);
request.Method = “POST”; request.ContentType = “application/x-www-form-urlencoded”; request.ContentLength = data.Length;
using (var stream = request.GetRequestStream()) { stream.Write(data, 0, data.Length); }
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
这是一个包装HttpWebRequest。与比较HttpClient。
HttpWebRequest
可在:.NET Framework 1.1+,NET Standard 2.0+,.NET Core 2.0+
NET Standard 2.0+
.NET Core 2.0+
using System.Net; using System.Collections.Specialized;
using (var client = new WebClient())
{ var values = new NameValueCollection(); values[“thing1”] = “hello”; values[“thing2”] = “world”;
var response = client.UploadValues("http://www.example.com/recepticle.aspx", values); var responseString = Encoding.Default.GetString(response);
}
{ var responseString = client.DownloadString("http://www.example.com/recepticle.aspx”); }