.NET/C#发起GET和POST请求的几种方法

using System.Net;

GET：

 

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var request = (HttpWebRequest)WebRequest.Create("http://www.leadnt.com/recepticle.aspx"); var response = (HttpWebResponse)request.GetResponse(); var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

POST：

 

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var request = (HttpWebRequest)WebRequest.Create("http://www.leadnt.com/recepticle.aspx");   var postData = "thing1=hello";     postData += "&thing2=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();

第二种：WebClient，也过时了：

 

1 2	using System.Net; using System.Collections.Specialized;

GET：

 

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using (var client = new WebClient()) {     var responseString = client.DownloadString("http://www.leadnt.com/recepticle.aspx"); }

POST：

 

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using (var client = new WebClient()) {     var values = new NameValueCollection();     values["thing1"] = "hello";     values["thing2"] = "world";       var response = client.UploadValues("http://www.leadnt.com/recepticle.aspx", values);       var responseString = Encoding.Default.GetString(response); }

第三种：HttpClient 当前主流用法，异步请求，自.NET4.5开始可从Nuget包管理中获取。

 

1	using System.Net.Http;

GET:

 

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using (var client = new HttpClient()) {     var responseString = client.GetStringAsync("http://www.mydomain.com/recepticle.aspx"); }

POST:

 

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using (var client = new HttpClient()) {     var values = new List<KeyValuePair<string, string>>();     values.Add(new KeyValuePair<string, string>("thing1", "hello"));     values.Add(new KeyValuePair<string, string>("thing2 ", "world"));       var content = new FormUrlEncodedContent(values);       var response = await client.PostAsync("http://www.mydomain.com/recepticle.aspx", content);       var responseString = await response.Content.ReadAsStringAsync(); }

第四种：第三方类库：

RestSharp

REST API请求测试类库，可通过  NuGet 获得。

Flurl.Http

最新的便捷的api测试工具，使用HttpClient实现，可通过 NuGet 安装。

 

1	using Flurl.Http;

GET:

 

1 2	var responseString = await "http://www.mydomain.com/recepticle.aspx"     .GetStringAsync();

POST:

 

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var responseString = await "http://www.mydomain.com/recepticle.aspx"     .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })     .ReceiveString();