html发送post请求,如何发出HTTP POST Web请求

小编典典

有几种执行HTTP GET和POST请求的方法：

方法A：HttpClient(首选)

可用：.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;

设定

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。

private static readonly HttpClient client = new HttpClient();

POST

var values = new Dictionary

{

{ “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();

GET

var responseString = await client.GetStringAsync(“http://www.example.com/recepticle.aspx”);

方法B：第三方库

POSTvar 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;

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;

POST

var responseString = await “http://www.example.com/recepticle.aspx”

.PostUrlEncodedAsync(new { thing1 = “hello”, thing2 = “world” })

.ReceiveString();

GET

var responseString = await “http://www.example.com/recepticle.aspx”

.GetStringAsync();

方法C：HttpWebRequest(不建议用于新工作)

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。

using System.Net;

using System.Text; // For class Encoding

using System.IO; // For StreamReader

POST

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();

GET

var request = (HttpWebRequest)WebRequest.Create(“http://www.example.com/recepticle.aspx”);

var response = (HttpWebResponse)request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

方法D：WebClient(不建议用于新工作)

这是一个包装HttpWebRequest。与比较HttpClient。

可在：.NET Framework 1.1+，NET Standard 2.0+，.NET Core 2.0+

using System.Net;

using System.Collections.Specialized;

POST

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);

}

GET

using (var client = new WebClient())

{

var responseString = client.DownloadString(“http://www.example.com/recepticle.aspx”);

}

2020-05-19