Updated: April 2009
Enables ASP.NET to read the HTTP values sent by a client during a Web request.
(in System.Web.dll)
Visual Basic (Declaration)
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class HttpRequest
Dim instance As HttpRequest
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class HttpRequest
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class HttpRequest sealed
public final class HttpRequest
The methods and properties of the HttpRequest class are exposed through the Request properties of the HttpApplication, HttpContext, Page, and UserControl classes.
.gif) Note: |
|---|
Unicode support for HttpRequest class members requires IIS version 6.0 or later. |
The following example uses the StreamWriter class to write the values of several HttpRequest class properties 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. In ASP.NET markup, the Request keyword refers to the HttpRequest object.
.gif) Security Note: |
|---|
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. |
<%@ 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 >
<head>
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<p>
</p>
<p>
Enter your name 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>
<%@ Page Language="C#" %>
<%@ 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 string INFO_DIR = @"c:\temp\CS\RequestDetails";
public static int requestCount;
private void Page_Load(object sender, System.EventArgs e)
{
// Create a variable to use when iterating
// through the UserLanguages property.
int langCount;
int requestNumber = Interlocked.Increment(ref requestCount);
// Create the file to contain information about the request.
string strFilePath = INFO_DIR + requestNumber.ToString() + @".txt";
StreamWriter sw = 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.
// String[] formArray = Request.Form.AllKeys;
foreach (string s in Request.Form)
{
sw.WriteLine("Form: " + Server.HtmlEncode(s));
}
// Write the PathInfo property value
// or a string if it is empty.
if (Request.PathInfo == String.Empty)
{
sw.WriteLine("The PathInfo property contains no information.");
}
else
{
sw.WriteLine(Server.HtmlEncode(Request.PathInfo));
}
// 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)
{
sw.WriteLine("The request is 1KB or greater");
}
else
{
sw.WriteLine("The request is less than 1KB");
}
// 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; langCount < Request.UserLanguages.Length; langCount++)
{
sw.WriteLine(@"User Language " + langCount +": " + Server.HtmlEncode(Request.UserLanguages[langCount]));
}
}
finally
{
// Close the stream to the file.
sw.Close();
}
lblInfoSent.Text = "Information about this request has been sent to a file.";
}
private void btnSendInfo_Click(object sender, System.EventArgs e)
{
lblInfoSent.Text = "Hello, " + Server.HtmlEncode(txtBoxName.Text) +
". You have created a new request info file.";
}
</script>
<html >
<head>
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<p>
</p>
<p>
Enter your name 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>
System..::.Object
System.Web..::.HttpRequest
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
Reference
Date | History | Reason |
|---|
April 2009
| Added a note explaining that the Request keyword in markup refers to the HttpRequest object. |
Customer feedback.
|