asp.net 发送 xml post请求和接收 xml post请求时出现(500) 内部服务器错误(WebClient学习笔记)

　　在.net中发送 xml post请求和接受xml 的post请求时，经常会遇到“远程服务器返回错误: (500) 内部服务器错误”。这里有2种解决办法：

　　第一种：修改请求端Content-Type 为“text/xml”(httpclient.Headers.Add("Content-Type", "text/xml");)

　　代码如下：

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using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Net; 

namespace Common 
{ 
/// <summary> 
/// 继承WebClient类 
/// 提供向 URI 标识的资源发送数据和从 URI 标识的资源接收数据的公共方法 
/// 支持以 http:、https:、ftp:、和 file: 方案标识符开头的 URI 
/// </summary> 
public class HttpClient : WebClient 
{ 
#region 远程POST数据并返回数据 
/// <summary> 
/// 利用WebClient 远程POST数据并返回数据 
/// </summary> 
/// <param name="strUrl">远程URL地址</param> 
/// <param name="strParams">参数</param> 
/// <param name="RespEncode">POST数据的编码</param> 
/// <param name="ReqEncode">获取数据的编码</param> 
/// <returns></returns> 
public static string PostData(string strUrl, string strParams, Encoding RespEncode, Encoding ReqEncode) 
{ 
HttpClient httpclient = new HttpClient(); 
try 
{ 
//打开页面 
httpclient.Credentials = CredentialCache.DefaultCredentials; 
//从指定的URI下载资源 
byte[] responseData = httpclient.DownloadData(strUrl); 
string srcString = RespEncode.GetString(responseData); 

httpclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded"); 
string postString = strParams; 
// 将字符串转换成字节数组 
byte[] postData = Encoding.ASCII.GetBytes(postString); 
// 上传数据，返回页面的字节数组 
responseData = httpclient.UploadData(strUrl, "POST", postData); 
srcString = ReqEncode.GetString(responseData); 

return srcString; 
} 
catch(Exception ex) 
{ 
//记录异常日志 
//释放资源 
httpclient.Dispose(); 
return string.Empty; 
} 
} 

#endregion 


/// <summary> 
/// 利用WebClient 远程POST XML数据并返回数据 
/// </summary> 
/// <param name="strUrl">远程URL地址</param> 
/// <param name="strParams">参数</param> 
/// <param name="RespEncode">POST数据的编码</param> 
/// <param name="ReqEncode">获取数据的编码</param> 
/// <returns></returns> 
public static string PostXmlData(string strUrl, string strParams, Encoding RespEncode, Encoding ReqEncode) 
{ 
HttpClient httpclient = new HttpClient(); 
try 
{ 
//打开页面 
httpclient.Credentials = CredentialCache.DefaultCredentials; 
//从指定的URI下载资源 
byte[] responseData = httpclient.DownloadData(strUrl); 
string srcString = RespEncode.GetString(responseData); 

httpclient.Headers.Add("Content-Type", "text/xml"); 
string postString = strParams; 
// 将字符串转换成字节数组 
byte[] postData = Encoding.ASCII.GetBytes(postString); 
// 上传数据，返回页面的字节数组 
responseData = httpclient.UploadData(strUrl, "POST", postData); 
srcString = ReqEncode.GetString(responseData); 

return srcString; 
} 
catch(Exception ex) 
{ 
//记录异常日志 
//释放资源 
httpclient.Dispose(); 
return string.Empty; 
} 
} 
} 
} 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Net; 

namespace Common 
{ 
/// <summary> 
/// 继承WebClient类 
/// 提供向 URI 标识的资源发送数据和从 URI 标识的资源接收数据的公共方法 
/// 支持以 http:、https:、ftp:、和 file: 方案标识符开头的 URI 
/// </summary> 
public class HttpClient : WebClient 
{ 
#region 远程POST数据并返回数据 
/// <summary> 
/// 利用WebClient 远程POST数据并返回数据 
/// </summary> 
/// <param name="strUrl">远程URL地址</param> 
/// <param name="strParams">参数</param> 
/// <param name="RespEncode">POST数据的编码</param> 
/// <param name="ReqEncode">获取数据的编码</param> 
/// <returns></returns> 
public static string PostData(string strUrl, string strParams, Encoding RespEncode, Encoding ReqEncode) 
{ 
HttpClient httpclient = new HttpClient(); 
try 
{ 
//打开页面 
httpclient.Credentials = CredentialCache.DefaultCredentials; 
//从指定的URI下载资源 
byte[] responseData = httpclient.DownloadData(strUrl); 
string srcString = RespEncode.GetString(responseData); 

httpclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded"); 

string postString = strParams; 
// 将字符串转换成字节数组 
byte[] postData = Encoding.ASCII.GetBytes(postString); 
// 上传数据，返回页面的字节数组 
responseData = httpclient.UploadData(strUrl, "POST", postData); 
srcString = ReqEncode.GetString(responseData); 

return srcString; 
} 
catch(Exception ex) 
{ 
//记录异常日志 
//释放资源 
httpclient.Dispose(); 
return string.Empty; 
} 
} 

#endregion 


/// <summary> 
/// 利用WebClient 远程POST XML数据并返回数据 
/// </summary> 
/// <param name="strUrl">远程URL地址</param> 
/// <param name="strParams">参数</param> 
/// <param name="RespEncode">POST数据的编码</param> 
/// <param name="ReqEncode">获取数据的编码</param> 
/// <returns></returns> 
public static string PostXmlData(string strUrl, string strParams, Encoding RespEncode, Encoding ReqEncode) 
{ 
HttpClient httpclient = new HttpClient(); 
try 
{ 
//打开页面 
httpclient.Credentials = CredentialCache.DefaultCredentials; 
//从指定的URI下载资源 
byte[] responseData = httpclient.DownloadData(strUrl); 
string srcString = RespEncode.GetString(responseData); 

httpclient.Headers.Add("Content-Type", "text/xml"); 
string postString = strParams; 
// 将字符串转换成字节数组 
byte[] postData = Encoding.ASCII.GetBytes(postString); 
// 上传数据，返回页面的字节数组 
responseData = httpclient.UploadData(strUrl, "POST", postData); 
srcString = ReqEncode.GetString(responseData); 

return srcString; 
} 
catch(Exception ex) 
{ 
//记录异常日志 
//释放资源 
httpclient.Dispose(); 
return string.Empty; 
} 
} 
} 
}

调用：

string strUrl = http://localhost/testxml/Default.aspx; 

string strParams = @"<?xml version=""1.0"" encoding=""UTF-8"" ?><channel><title>blogweather</title></channel>"; 

string returnValue = HttpClient.PostXmlData(strUrl, strParams, Encoding.UTF8, Encoding.UTF8);

　　这种方法适用于接收端是不同语言开发的web服务(jsp,php,asp.net等)

　　第二种：在我们平常开发异步接口的时候，往往需要开发一个windows service用来发送post请求（可以调用第一种方法）；另外需要提供一个web接收端接收对方的异步调用。当接收的post数据是xml时，对方调用你的提供的接口是就会出现“远程服务器返回错误: (500) 内部服务器错误。”。

　　这是请求验证所导致的，只需要禁用掉请求验证就可以正常通讯了。在<@Page..%>中设置 ValidateRequest="false" 即可。（这里无需修改Content-type）

　　请求端调用：

string strUrl = http://localhost/testxml/Default2.aspx; 

string strParams = @"<?xml version=""1.0"" encoding=""UTF-8"" ?><channel><title>blogweather</title></channel>"; 

string returnValue = HttpClient.PostData(strUrl, strParams, Encoding.UTF8, Encoding.UTF8);

　　或者

string returnValue = HttpClient.PostXmlData(strUrl, strParams, Encoding.UTF8, Encoding.UTF8);

　　接收post xml 请求：

string request; 
using (Stream MyStream = Request.InputStream) 
{ 
byte[] _tmpData = new byte[MyStream.Length]; 
MyStream.Read(_tmpData, 0, _tmpData.Length); 
request = Encoding.UTF8.GetString(_tmpData); 
} 
Response.Write(request);