在实际开发中，我们经常会使用到API，所谓API一般就是一个地址，我们称之为接口。然后我们通过用C#对这地址发送请求，请求后，服务器就会给我们返回数据，一般是XML或者JSON，这里我们讲述的是JSON。
using System;using System.Collections.Generic;using System.Linq;using System.Text;using ;using System.IO;namespace WindowsFormsApplication1{public class HttpUitls{public static string Get(string Url){//System.GC.Collect();HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Proxy = null;request.KeepAlive = false;request.Method = "GET";request.ContentType = "application/json; charset=UTF-8";request.AutomaticDecompression = DecompressionMethods.GZip;HttpWebResponse response = (HttpWebResponse)request.GetResponse();Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response != null){response.Close();}if (request != null){request.Abort();}return retString;}public static string Post(string Url, string Data, string Referer){HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Method = "POST";request.Referer = Referer;byte[] bytes = Encoding.UTF8.GetBytes(Data);request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = bytes.Length;Stream myResponseStream = request.GetRequestStream();myResponseStream.Write(bytes, 0, bytes.Length);HttpWebResponse response = (HttpWebResponse)request.GetResponse();StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response != null){response.Close();}if (request != null){request.Abort();}return retString;}}}
using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication1{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){//我们的接口string url = "/query?type=shunfeng&postid=367847964498";//将接口传入，这个HttpUitls的类，有兴趣可以研究下，也可以直接用就可以，不用管如何实现。string getJson = HttpUitls.Get(url);MessageBox.Show(getJson);}}}
文章代码来自:C#从http上拿返回JSON数据 - 心所欲 - 博客园 ()/zoujinhua/p/10330037.html
