Describes an exception that occurred during the processing of HTTP requests.
(in System.Web.dll)
Visual Basic (Declaration)
<SerializableAttribute> _
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class HttpException _
Inherits ExternalException
Dim instance As HttpException
[SerializableAttribute]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class HttpException : ExternalException
[SerializableAttribute]
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction::InheritanceDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class HttpException : public ExternalException
public class HttpException extends ExternalException
The HttpException class is an HTTP-specific exception class that enables ASP.NET to generate exception information. For more information about throwing and handling exceptions, see Handling and Throwing Exceptions.
The following code example demonstrates how to use the HttpException class to raise customized exceptions. The Button_Click method determines which button was clicked, and then calls either the CheckNumber or CheckBoolean method. If the user-entered value in the text box does not correspond to the expected type, an HttpException exception is created and thrown with a customized message based on the error type.
.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" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub CheckNumber()
Try
' Check whether the value is an integer.
Dim convertInt As String = textbox1.Text
Convert.ToInt32(convertInt)
Catch e As Exception
' Throw an HttpException with customized message.
Throw New HttpException("not an integer")
End Try
End Sub
Sub CheckBoolean()
Try
' Check whether the value is an boolean.
Dim convertBool As String = textbox1.Text
Convert.ToBoolean(convertBool)
Catch e As Exception
' Throw an HttpException with customized message.
Throw New HttpException("not a boolean")
End Try
End Sub
Sub Button_Click(ByVal sender As [Object], ByVal e As EventArgs)
Try
' Check to see which button was clicked.
Dim b As Button = CType(sender, Button)
If b.ID.StartsWith("button1") Then
CheckNumber()
ElseIf b.ID.StartsWith("button2") Then
CheckBoolean()
End If
label1.Text = "You entered: " + textbox1.Text
label1.ForeColor = System.Drawing.Color.Black
' Catch the HttpException.
Catch exp As HttpException
label1.Text = "An HttpException was raised. " + "The value entered in the textbox is " + exp.Message.ToString()
label1.ForeColor = System.Drawing.Color.Red
End Try
End Sub
</script>
<html >
<head runat="server">
<title>HttpException Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<br />
<b>Enter a value in the text box.</b>
<br />
<asp:TextBox ID="textbox1"
Runat="server">
</asp:TextBox>
<br />
<asp:Button ID="button1"
Text="Check for integer."
OnClick="Button_Click"
Runat="server">
</asp:Button>
<br />
<asp:Button ID="button2"
Text="Check for boolean."
OnClick="Button_Click"
Runat="server">
</asp:Button>
<br />
<asp:Label ID="label1"
Runat="server">
</asp:Label>
</div>
</form>
</body>
</html>
<%@ 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">
void CheckNumber()
{
try
{
// Check whether the value is an integer.
String convertInt = textbox1.Text;
Convert.ToInt32(convertInt);
}
catch (Exception e)
{
// Throw an HttpException with customized message.
throw new HttpException("not an integer");
}
}
void CheckBoolean()
{
try
{
// Check whether the value is an boolean.
String convertBool = textbox1.Text;
Convert.ToBoolean(convertBool);
}
catch (Exception e)
{
// Throw an HttpException with customized message.
throw new HttpException("not a boolean");
}
}
void Button_Click(Object sender, EventArgs e)
{
try
{
// Check to see which button was clicked.
Button b = (Button)sender;
if (b.ID.StartsWith("button1"))
CheckNumber();
else if (b.ID.StartsWith("button2"))
CheckBoolean();
label1.Text = "You entered: " + textbox1.Text;
label1.ForeColor = System.Drawing.Color.Black;
}
// Catch the HttpException.
catch (HttpException exp)
{
label1.Text = "An HttpException was raised. "
+ "The value entered in the textbox is " + exp.Message.ToString();
label1.ForeColor = System.Drawing.Color.Red;
}
}
</script>
<html >
<head runat="server">
<title>HttpException Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<br />
<b>Enter a value in the text box.</b>
<br />
<asp:TextBox ID="textbox1"
Runat="server">
</asp:TextBox>
<br />
<asp:Button ID="button1"
Text="Check for integer."
OnClick="Button_Click"
Runat="server">
</asp:Button>
<br />
<asp:Button ID="button2"
Text="Check for boolean."
OnClick="Button_Click"
Runat="server">
</asp:Button>
<br />
<asp:Label ID="label1"
Runat="server">
</asp:Label>
</div>
</form>
</body>
</html>
System..::.Object
System..::.Exception
System..::.SystemException
System.Runtime.InteropServices..::.ExternalException
System.Web..::.HttpException
System.Web..::.HttpCompileException
System.Web..::.HttpParseException
System.Web..::.HttpRequestValidationException
System.Web..::.HttpUnhandledException
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
Other Resources