HttpRequest Class
Assembly: System.Web (in system.web.dll)
The methods and properties of the HttpRequest class are exposed through the Request properties of the HttpApplication, HttpContext, Page, and UserControl classes.
Note: |
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| Unicode support for HttpRequest class members requires IIS version 6.0 or later. |
| Topic | Location |
|---|---|
| How to: Pass Values Between ASP.NET Web Pages | Building ASP .NET Web Applications |
| How to: Pass Values Between ASP.NET Web Pages | Building ASP .NET Web Applications |
The following example uses the StreamWriter class to write the values of several HttpRequest class properties values to a file. For properties that are of type string, the values are HTML encoded as they are written to the file. Properties that represent a collection are looped through, and each key/value pair that they contain is written to the file.
Security Note: |
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| This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio). |
<%@ Page Language="VB" %> <%@ import Namespace="System.Threading" %> <%@ import Namespace="System.IO" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> ' NOTE: To use this sample, create a c:\temp\CS folder, ' add the ASP.NET account (in IIS 5.x <machinename>\ASPNET, ' in IIS 6.x NETWORK SERVICE), and give it write permissions ' to the folder. Private Const INFO_DIR As String = "c:\temp\VB\RequestDetails" Public Shared requestCount As Integer Private Sub Page_Load(sender As Object, e As System.EventArgs) ' Create a variable to use when iterating ' through the UserLanguages property. Dim langCount As Integer ' Create a counter to name the file. Dim requestNumber As Integer = _ Interlocked.Increment(requestCount) ' Create the file to contain information about the request. Dim strFilePath As String = INFO_DIR & requestNumber.ToString() & ".txt" Dim sw As StreamWriter = File.CreateText(strFilePath) Try ' Write request information to the file with HTML encoding. sw.WriteLine(Server.HtmlEncode(DateTime.Now.ToString())) sw.WriteLine(Server.HtmlEncode(Request.CurrentExecutionFilePath)) sw.WriteLine(Server.HtmlEncode(Request.ApplicationPath)) sw.WriteLine(Server.HtmlEncode(Request.FilePath)) sw.WriteLine(Server.HtmlEncode(Request.Path)) ' Iterate through the Form collection and write ' the values to the file with HTML encoding. For Each s As String In Request.Form sw.WriteLine("Form: " & Server.HtmlEncode(s)) Next s ' Write the PathInfo property value ' or a string if it is empty. If Request.PathInfo = String.Empty Then sw.WriteLine("The PathInfo property contains no information.") Else sw.WriteLine(Server.HtmlEncode(Request.PathInfo)) End If ' Write request information to the file with HTML encoding. sw.WriteLine(Server.HtmlEncode(Request.PhysicalApplicationPath)) sw.WriteLine(Server.HtmlEncode(Request.PhysicalPath)) sw.WriteLine(Server.HtmlEncode(Request.RawUrl)) ' Write a message to the file dependent upon ' the value of the TotalBytes property. If Request.TotalBytes > 1000 Then sw.WriteLine("The request is 1KB or greater") Else sw.WriteLine("The request is less than 1KB") End If ' Write request information to the file with HTML encoding. sw.WriteLine(Server.HtmlEncode(Request.RequestType)) sw.WriteLine(Server.HtmlEncode(Request.UserHostAddress)) sw.WriteLine(Server.HtmlEncode(Request.UserHostName)) sw.WriteLine(Server.HtmlEncode(Request.HttpMethod)) ' Iterate through the UserLanguages collection and ' write its HTML encoded values to the file. For langCount = 0 To Request.UserLanguages.Length - 1 sw.WriteLine("User Language " & langCount.ToString() & _ ": " & Server.HtmlEncode( _ Request.UserLanguages(langCount))) Next Finally ' Close the stream to the file. sw.Close() End Try lblInfoSent.Text = _ "Information about this request has been sent to a file." End Sub 'Page_Load Private Sub btnSendInfo_Click(sender As Object, e As System.EventArgs) lblInfoSent.Text = _ "Hello, " & Server.HtmlEncode(txtBoxName.Text) & _ ". You have created a new request info file." End Sub 'btnSendInfo_Click </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>ASP.NET Example</title> </head> <body> <form id="form1" runat="server"> <p> </p> <p> Enter your hame here: <asp:TextBox id="txtBoxName" runat="server"></asp:TextBox> </p> <p> <asp:Button id="btnSendInfo" onclick="btnSendInfo_Click" runat="server" Text="Click Here"></asp:Button> </p> <p> <asp:Label id="lblInfoSent" runat="server"></asp:Label> </p> </form> </body> </html>
- AspNetHostingPermission for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
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