一、文件流方式（转自：http://blog.csdn.net/u011511086/article/details/53216330）
/// 发送请求
/// </summary>
/// <param name="url">请求地址</param>
/// <param name="sendData">参数格式 “name=王武&pass=123456”</param>
/// <returns></returns>
public static string RequestWebAPI(string url, string sendData)
{
string backMsg = "";
try
{
System.Net.WebRequest httpRquest = System.Net.HttpWebRequest.Create(url);
httpRquest.Method = "POST";
//这行代码很关键，不设置ContentType将导致后台参数获取不到值
httpRquest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
byte[] dataArray = System.Text.Encoding.UTF8.GetBytes(sendData);
//httpRquest.ContentLength = dataArray.Length;
System.IO.Stream requestStream = null;
if (string.IsNullOrWhiteSpace(sendData) == false)
{
requestStream = httpRquest.GetRequestStream();
requestStream.Write(dataArray, , dataArray.Length);
requestStream.Close();
}
System.Net.WebResponse response = httpRquest.GetResponse();
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, System.Text.Encoding.UTF8);
backMsg = reader.ReadToEnd(); reader.Close();
reader.Dispose(); requestStream.Dispose();
responseStream.Close();
responseStream.Dispose();
}
catch (Exception)
{
throw;
}
return backMsg;
}
二、HttpClient方式（转自：http://blog.csdn.net/qianmenfei/article/details/37974767）
1、通用http类
using System;
using System.Globalization;
using System.Net;
using System.Text; namespace Test
{
public class HttpCommon
{
/// <summary>
/// Http同步Get同步请求
/// </summary>
/// <param name="url">Url地址</param>
/// <param name="encode">编码(默认UTF8)</param>
/// <returns></returns>
public static string HttpGet(string url, Encoding encode = null)
{
string result; try
{
var webClient = new WebClient { Encoding = Encoding.UTF8 }; if (encode != null)
webClient.Encoding = encode; result = webClient.DownloadString(url);
}
catch (Exception ex)
{
result = ex.Message;
} return result;
} /// <summary>
/// Http同步Get异步请求
/// </summary>
/// <param name="url">Url地址</param>
/// <param name="callBackDownStringCompleted">回调事件</param>
/// <param name="encode">编码(默认UTF8)</param>
public static void HttpGetAsync(string url,
DownloadStringCompletedEventHandler callBackDownStringCompleted = null, Encoding encode = null)
{
var webClient = new WebClient { Encoding = Encoding.UTF8 }; if (encode != null)
webClient.Encoding = encode; if (callBackDownStringCompleted != null)
webClient.DownloadStringCompleted += callBackDownStringCompleted; webClient.DownloadStringAsync(new Uri(url));
} /// <summary>
/// Http同步Post同步请求
/// </summary>
/// <param name="url">Url地址</param>
/// <param name="postStr">请求Url数据</param>
/// <param name="encode">编码(默认UTF8)</param>
/// <returns></returns>
public static string HttpPost(string url, string postStr = "", Encoding encode = null)
{
string result; try
{
var webClient = new WebClient { Encoding = Encoding.UTF8 }; if (encode != null)
webClient.Encoding = encode; var sendData = Encoding.GetEncoding("GB2312").GetBytes(postStr); webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
webClient.Headers.Add("ContentLength", sendData.Length.ToString(CultureInfo.InvariantCulture)); var readData = webClient.UploadData(url, "POST", sendData); result = Encoding.GetEncoding("GB2312").GetString(readData); }
catch (Exception ex)
{
result = ex.Message;
} return result;
} /// <summary>
/// Http同步Post异步请求
/// </summary>
/// <param name="url">Url地址</param>
/// <param name="postStr">请求Url数据</param>
/// <param name="callBackUploadDataCompleted">回调事件</param>
/// <param name="encode"></param>
public static void HttpPostAsync(string url, string postStr = "",
UploadDataCompletedEventHandler callBackUploadDataCompleted = null, Encoding encode = null)
{
var webClient = new WebClient { Encoding = Encoding.UTF8 }; if (encode != null)
webClient.Encoding = encode; var sendData = Encoding.GetEncoding("GB2312").GetBytes(postStr); webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
webClient.Headers.Add("ContentLength", sendData.Length.ToString(CultureInfo.InvariantCulture)); if (callBackUploadDataCompleted != null)
webClient.UploadDataCompleted += callBackUploadDataCompleted; webClient.UploadDataAsync(new Uri(url), "POST", sendData);
}
}
}
2、调用类
using System;
using System.Net;
using System.Text;
using System.Web.UI; namespace Test
{
public partial class WebForm3 : Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(HttpCommon.HttpGet("http://localhost:14954/WebForm4.aspx")); //Get同步
HttpCommon.HttpGetAsync("http://localhost:14954/WebForm4.aspx"); //Get异步
HttpCommon.HttpGetAsync("http://localhost:14954/WebForm4.aspx", DownStringCompleted); //Get异步回调 Response.Write(HttpCommon.HttpPost("http://localhost:14954/WebForm4.aspx", "post=POST")); //Post同步
HttpCommon.HttpPostAsync("http://localhost:14954/WebForm4.aspx", "post=POST"); //Post异步
HttpCommon.HttpPostAsync("http://localhost:14954/WebForm4.aspx", "post=POST", UploadDataCompleted); //Post异步回调
} private void DownStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
Response.Write(e.Result);
} private void UploadDataCompleted(object sender, UploadDataCompletedEventArgs e)
{
Response.Write(Encoding.GetEncoding("GB2312").GetString(e.Result));
}
}
}