一个封装好的Asp.Net C# HttpRequest请求类

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using

System;

using

System.Collections.Generic;

using

System.Linq;

using

System.Text;

using

System.Net;

using

System.IO;

namespace

WebRequestAPP

{

/// <summary>

/// Http请求

/// </summary>

public

class

HttpUtility

{

/// <summary>

///通用HttpWebRequest

/// </summary>

/// <param name="method">请求方式（POST/GET）</param>

/// <param name="url">请求地址</param>

/// <param name="param">请求参数</param>

/// <param name="onComplete">完成后执行的操作(可选参数，通过此方法可以获取到HTTP状态码)</param>

/// <returns>请求返回的结果</returns>

public

static

string Request(string method, string url, string param, Action<HttpStatusCode,string> onComplete = null)

{

if

(string.IsNullOrEmpty(url))

throw

new

ArgumentNullException(

"URL"

);

switch

(method.ToUpper())

{

case

"POST"

return

Post(url, param, onComplete);

case

"GET"

return

Get(url, param, onComplete);

default

throw

new

EntryPointNotFoundException(

"method:"

+ method);

}

}

/// <summary>

/// Post请求

/// </summary>

/// <param name="url">请求地址</param>

/// <param name="param">参数</param>

/// <param name="onComplete">完成后执行的操作(可选参数，通过此方法可以获取到HTTP状态码)</param>

/// <returns>请求返回的结果</returns>

public

static

string Post(string url, string param, Action<HttpStatusCode, string> onComplete = null)

{

UrlCheck(ref url);

byte[] bufferBytes = Encoding.UTF8.GetBytes(param);

var request = WebRequest.Create(url) as HttpWebRequest;

//HttpWebRequest方法继承自WebRequest, Create方法在WebRequest中定义，因此此处要显示的转换

request.Method =

"POST"

;

request.ContentLength = bufferBytes.Length;

request.ContentType =

"application/x-www-form-urlencoded"

;

try

{

using

(var requestStream = request.GetRequestStream())

{

requestStream.Write(bufferBytes, 0, bufferBytes.Length);

}

}

catch

(WebException ex)

{

return

ex.Message;

}

return

HttpRequest(request, onComplete);

}

/// <summary>

/// GET请求

/// </summary>

/// <param name="url">请求地址</param>

/// <param name="param">参数</param>

/// <param name="onComplete">完成后执行的操作(可选参数，通过此方法可以获取到HTTP状态码)</param>

/// <returns>请求返回结果</returns>

public

static

string Get(string url, string param, Action<HttpStatusCode, string> onComplete = null)

{

UrlCheck(ref url);

if

(!string.IsNullOrEmpty(param))

if

(!param.StartsWith(

"?"

))

param +=

"?"

+ param;

else

param +=param;

var request = WebRequest.Create(url) as HttpWebRequest;

request.Method =

"GET"

;

request.ContentType =

"application/x-www-form-urlencoded"

;

return

HttpRequest(request, onComplete);

}

/// <summary>

/// 请求的主体部分（由此完成请求并返回请求结果）

/// </summary>

/// <param name="request">请求的对象</param>

/// <param name="onComplete">完成后执行的操作(可选参数，通过此方法可以获取到HTTP状态码)</param>

/// <returns>请求返回结果</returns>

private

static

string HttpRequest(HttpWebRequest request, Action<HttpStatusCode, string> onComplete = null)

{

HttpWebResponse response = null;

try

{

response = request.GetResponse() as HttpWebResponse;

}

catch

(WebException ex)

{

response = ex.Response as HttpWebResponse;

}

if

(response == null)

{

if

(onComplete != null)

onComplete(HttpStatusCode.NotFound,

"请求远程返回为空"

);

return

null;

}

string result = string.Empty;

using

(StreamReader reader =

new

StreamReader(response.GetResponseStream()))

{

result = reader.ReadToEnd();

}

if

(onComplete != null)

onComplete(response.StatusCode, result);

return

result;

}

/// <summary>

/// URL拼写完整性检查

/// </summary>

/// <param name="url">待检查的URL</param>

private

static

void

UrlCheck(ref string url)

{

if

(!url.StartsWith(

"http://"

) && !url.StartsWith(

"https://"

))

url=

"http://"

+url;

}

}

}

http://www.dedecms.com/knowledge/program/asp-donet/2012/0803/4214.html