Enables ASP.NET to read the HTTP values sent by a client during a Web request.
Namespace: System.Web
Assembly: System.Web (in system.web.dll)
Visual Basic (Declaration)
Public NotInheritable Class HttpRequest
Dim instance As HttpRequest
public sealed class HttpRequest
public ref class HttpRequest sealed
public final class HttpRequest
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.
The following code 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, with each key/value pair they contain written to the file.
<%@ Page Language="VB" %>
<%@ import Namespace="System.Threading" %>
<%@ import Namespace="System.IO" %>
<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>
</head>
<body>
<form 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>
<%@ Page Language="C#" %>
<%@ import Namespace="System.Threading" %>
<%@ import Namespace="System.IO" %>
<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>
</head>
<body>
<form 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>
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 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
.NET Framework
Supported in: 2.0, 1.1, 1.0