Url 相关操作

【301重定向】

static void Redirect301(string url)
{
      HttpContext.Current.Response.StatusCode = 301;
      HttpContext.Current.Response.RedirectLocation = url;
      HttpContext.Current.Response.End();
}

【串行参数】

 static string GetQueryString(NameValueCollection list)
 {
       StringBuilder sb = new StringBuilder();          
       for (int i=0; i<list.Count; i++)
       {               
         sb.AppendFormat("{0}={1}&",list.GetKey(i),HttpUtility.UrlEncode(list[i]));
       }
       return sb.ToString().Trim('&');
 }

【将带~/ 的相对地址转为绝对地址】

 static string ResolveUrl(string url)
{
    string approot = HttpContext.Current.Request.ApplicationPath;
    if (url.Length == 0 || url[0] != '~')
        return url;
    else
    {
        if (url.Length == 1)
            return approot;  
        if (url[1] == '/' || url[1] == '\\')
        {
            // url: ~/  或者  ~\
            if (approot.Length > 1)
                return approot + "/" + url.Substring(2);
            else
                return "/" + url.Substring(2);
        }
        else
        {
            // url: ~xxxxx
            if (approot.Length > 1)
                return approot + "/" + url.Substring(1);
            else
                return approot + url.Substring(1);
        }
    }
}

【UrlEncode || UrlDecode】

static string unreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

public static string UrlEncode(this string value)
{
    StringBuilder result = new StringBuilder();
    foreach (char symbol in value)
    {
        if (unreservedChars.IndexOf(symbol) > -1)
        {
            result.Append(symbol);
        }
        else
        {
            result.AppendFormat("%{0:X2}", (int)symbol);
        }
    }
    return result.ToString();
}

public static string UrlEncode(this string value, Encoding encode)
{
    StringBuilder result = new StringBuilder();
    byte[] data = encode.GetBytes(value);
    int len = data.Length;

    for (int i = 0; i < len; i++)
    {
        int c = data[i];
        if (c < 0x80 && unreservedChars.IndexOf((char)c) != -1)
        {
            result.Append((char)c);
        }
        else
        {
            result.Append('%' + String.Format("{0:X2}", (int)data[i]));
        }
    }

    return result.ToString();
}

【Timestamp】

public static string GetTimestamp()
{
    var date1970 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
    var timeStamp = (long)DateTime.UtcNow.Subtract(date1970).TotalSeconds;
    return timeStamp.ToString();
}

【request】

public XDocument GetXml(string url)
{
       XDocument doc = null;
       var str = new WebClient().DownloadString(url);
       doc = XDocument.Parse(str);
       return doc;
 }

public XDocument  GetXml(string apiUrl)
{ 
  XDocument doc = null;
  var request = HttpWebRequest.Create(apiUrl) as HttpWebRequest;
  request.Method = "POST";
  try
  {
     var response = request.GetResponse() as HttpWebResponse;
     if (response.StatusCode == HttpStatusCode.OK)
      {
            using (var sr = new StreamReader(response.GetResponseStream()))
           {
                   doc = XDocument.Parse(sr.ReadToEnd());
           }

       }
  }
  catch (WebException ex)
  {
        throw ex;
  }

  return doc;
}

 【Url重写】

public class UrlRewriteModule : IHttpModule
    {   
        public void Dispose()
        {
        }

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        void context_BeginRequest(object sender, EventArgs e)
        {
            var application = (HttpApplication)sender;
            var context = application.Context;
            var request = context.Request;
            var url = request.Path;
           var newUrl=GetRewriteUrl(url);
            var parms=new NameValueCollection();           
                parms["id"] = 101; 
                parms["type"]=2;           
            context.RewritePath(newUrl, String.Empty,   GetQueryString(parms));
       }
}

<?xml version="1.0"?>
<configuration>
   <system.web>
     <httpModules>
         <add name="RewriteModule" type="UrlRewrite.UrlRewriteModule, UrlRewrite"/>
       </httpModules>
  </system.web>
</configuration>