HttpUtility Class
.NET Framework 3.0
Provides methods for encoding and decoding URLs when processing Web requests. This class cannot be inherited.
Namespace: System.Web
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
The HttpUtility class is used internally by the HttpServerUtility class, whose methods and properties are exposed through the intrinsic ASP.NET Server object. Additionally, the HttpUtility class contains encoding and decoding utility methods that are not accessible from the Server.
The following code example demonstrates the use of the UrlEncode, UrlDecode), and ParseQueryString methods of the HttpUtility class.
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void Page_Load(object sender, EventArgs e) { String currurl = HttpContext.Current.Request.RawUrl; String querystring = null; // Check to make sure some query string variables // exist and if not add some and redirect. int iqs = currurl.IndexOf('?'); if (iqs == -1) { String redirecturl = currurl + "?var1=1&var2=2+2%2f3&var1=3"; Response.Redirect(redirecturl, true); } // If query string variables exist, put them in // a string. else if (iqs >= 0) { querystring = (iqs < currurl.Length - 1) ? currurl.Substring(iqs + 1) : String.Empty; } // Parse the query string variables into a NameValueCollection. NameValueCollection qscoll = HttpUtility.ParseQueryString(querystring); // Iterate through the collection. StringBuilder sb = new StringBuilder(); foreach (String s in qscoll.AllKeys) { sb.Append(s + " - " + qscoll[s] + "<br />"); } // Write the results to the appropriate labels. ParseOutput.Text = sb.ToString(); UrlRawOutput.Text = currurl; UrlEncodedOutput.Text = HttpUtility.UrlEncode(currurl); UrlDecodedOutput.Text = HttpUtility.UrlDecode(currurl); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>HttpUtility Example</title> </head> <body> <form id="form1" runat="server"> <div> The raw url is: <br /> <asp:Label id="UrlRawOutput" runat="server" /> <br /><br /> The url encoded is: <br /> <asp:Label id="UrlEncodedOutput" runat="server" /> <br /><br /> The url decoded is: <br /> <asp:Label id="UrlDecodedOutput" runat="server" /> <br /><br /> The query string NameValueCollection is: <br /> <asp:Label id="ParseOutput" runat="server" /> </div> </form> </body> </html>
- AspNetHostingPermission for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
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