.NET/C#发起GET和POST请求的几种方法

using System.Net;

GET：

var request = (HttpWebRequest)WebRequest.Create("http://www.leadnt.com/recepticle.aspx");

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

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

POST：

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：

using (var client = new WebClient())

{

var responseString = client.DownloadString("http://www.leadnt.com/recepticle.aspx");

}

POST：

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:

using (var client = new HttpClient())

{

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

}

POST:

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:

var responseString = await "http://www.mydomain.com/recepticle.aspx"

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

.ReceiveString();