这是一个使用HttpWebRequest可以通过参数或内容发送请求，但假设（或两者）都是传入的对象的某些代码的（非常）精简版本。例如，如果您需要发送像login和password的用法看起来像;
var response = HttpUtilities.Post("http://www.someurl.com/", new { login = "user", password = "1234");
// check response data + codes, etc...
var secondResponse = HttpUtilities.Post("http://www.someurl.com/page2", new { data = "stuff" });
下面的代码不一定会编译，因为我不得不手动剥离下来，并没有经过检验其目前的形式，但它给出了什么需要检查响应，调试，等一个非常好的主意;
namespace Helpers.Web
{
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Cache;
using System.Net.Http;
using System.Reflection;
using System.Web;
using Newtonsoft.Json;
using NLog;
public class HttpUtilities
{
#region NLog instance
/// <summary>
/// The single instance of an NLog LogManager for this class.
/// </summary>
private static Logger _logger = LogManager.GetCurrentClassLogger();
#endregion
#region Public Methods
public static TResponse Post<TResponse, TContent>(string uri, object parameters = null, TContent content = null)
where TContent : class
{
return GetResponse<TResponse, TContent>(uri, SerializeToQueryString(parameters),
content, HttpMethod.Post);
}
public static HttpWebResponse GetResponse<TContent>(string uri,
string parameters,
TContent content,
HttpMethod method)
where TContent : class
{
// build the full URL if parameters have been specified
if (!string.IsNullOrEmpty(parameters))
{
uri += "?" + parameters;
}
// make the request and send back the results
HttpWebRequest webRequest = BuildWebRequest(uri, content, method);
return GetWebResponse(uri, webRequest);
}
#endregion
#region Private Methods
private static HttpWebRequest BuildWebRequest<TContent>(string uri, TContent content, HttpMethod method)
where TContent : class
{
// get the request details
_logger.Trace("Building request for [{0}]", uri);
// set the web request details
_logger.Trace("Setting request header details...");
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(uri);
webRequest.Method = method.ToString();
webRequest.ContentType = "application/json";
webRequest.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
// do we have content to insert
string serializedContent = string.Empty;
if (content != null)
{
JsonSerializerSettings jsonSettings = new JsonSerializerSettings
{
// ignore the self referencing nature of EntityFramework objects and skip
// over the self references when serializing
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
};
// serialize the object as json and convert it into bytes we can
// inject into the content stream of the request.
serializedContent = JsonConvert.SerializeObject(content, jsonSettings);
UTF8Encoding encoding = new UTF8Encoding();
byte[] byteContent = encoding.GetBytes(serializedContent);
webRequest.ContentLength = byteContent.Length;
// write the content
// NOTE: the act of writing out the data actually sends the request!
_logger.Trace("Sending request and getting response from [{0}]", uri);
using (var contentStream = webRequest.GetRequestStream())
{
contentStream.Write(byteContent, 0, byteContent.Length);
}
_logger.Trace("Injected content into request to [{0}]. Content: {1}", uri, serializedContent);
}
else
{
// if there's no content then we haven't actually sent the request yet. However we still
// need to set the header details.
webRequest.ContentLength = 0;
_logger.Trace("Sending request and getting response from [{0}]", uri);
}
return webRequest;
}
private static HttpWebResponse GetWebResponse(string uri, HttpWebRequest webRequest)
{
HttpWebResponse response;
try
{
_logger.Debug("Sending [{0}] request to [{1}]...", webRequest.Method, webRequest.RequestUri.AbsoluteUri);
response = (HttpWebResponse)webRequest.GetResponse();
}
catch (WebException wex)
{
// we might still have response information on the request
// if this is so, then extract it and log it as we'll need to
// find out what the server actually replied with in order to debug
// what went on
_logger.Error(wex, "There was a problem getting a response from the server");
if (wex.Response != null)
{
try
{
// NOTE: this can be caused by the server returning a YSOD. You can see the formatted result
// in debug mode by using the HTML visualizer when looking at the content of the
// wResponseContent variable.
_logger.Debug("Attempting to extract server response details from WebException...");
using (Stream wResponseStream = wex.Response.GetResponseStream())
{
if (wResponseStream != null)
{
using (StreamReader wStreamReader = new StreamReader(wResponseStream))
{
string wResponseContent = wStreamReader.ReadToEnd();
_logger.Debug(wex, "Received fault response from [{0}]. Response: {1}",
uri, wResponseContent);
}
}
}
}
catch (Exception eex)
{
// there was an issue trying to get the response content from the original error.
// There's nothing more we can do except log this exception and rethrow the
// original.
_logger.Fatal(eex, "There was a problem getting response details from a WebException raised from the server");
throw;
}
}
else
{
_logger.Debug("No response data present in the exception.");
}
throw;
}
catch (Exception ex)
{
_logger.Error(ex, "There was a problem getting a response from [{0}]", uri);
throw;
}
return response;
}
private static string SerializeToQueryString(object parameters)
{
// if we weren't given anything then there's nothing we can do
if (parameters == null)
{
return string.Empty;
}
if (parameters is string)
{
return parameters as string;
}
// iterate over the parameter properties and build the query string
Type type = parameters.GetType();
BindingFlags flags = BindingFlags.Instance
| BindingFlags.GetProperty
| BindingFlags.Public;
if (type.IsInterface)
{
// if the type is an interface, only get the interface's members
flags |= BindingFlags.FlattenHierarchy;
}
PropertyInfo[] properties = type.GetProperties(flags);
List<string> urlParameters = new List<string>();
foreach (PropertyInfo prop in properties)
{
// convert the value to a string first so that we can make it safe
// to put into the URL
_logger.Trace("Getting value from {0}.{1} [{2}]", type.FullName, prop.Name, prop.PropertyType.FullName);
object rawValue = prop.GetValue(parameters, null);
string propertyValue = string.Empty;
if (rawValue != null)
{
propertyValue = rawValue.ToString();
}
urlParameters.Add(string.Format("{0}={1}", prop.Name, HttpUtility.UrlEncode(propertyValue)));
}
return string.Join("&", urlParameters.ToArray());
}
#endregion
}
}
是的，就像你提出一个请求一样。 – SLaks
那么这个样子的代码是什么样的？ – juliacas
@juliacas：完全像发送一个请求。 – SLaks