HttpParseException Class
Definition
Important
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The exception that is thrown when a parse error occurs.
public ref class HttpParseException sealed : System::Web::HttpExceptionpublic sealed class HttpParseException : System.Web.HttpException[System.Serializable]
public sealed class HttpParseException : System.Web.HttpExceptiontype HttpParseException = class
inherit HttpException[<System.Serializable>]
type HttpParseException = class
inherit HttpExceptionPublic NotInheritable Class HttpParseException
Inherits HttpException- Inheritance
- Attributes
Examples
The following example demonstrates how to use the HttpParseException to customize errors generated during page parsing. In this example, a customized HtmlSelect control is defined. If child elements of the custom control are not of a specified type then an HttpParseException is thrown in the overridden GetChildControlType method of a custom HtmlSelectBuilder. To generate a parse exception, change the child element literal MyCustomOption to any other string.
<%@ Page Language="C#"%>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HttpParseException Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>HttpParseException Example</h3>
<aspSample:CustomHtmlSelectWithHttpParseException
id="customhtmlselect1"
runat="server">
<aspSample:MyCustomOption optionid="option1" value="1"/>
<aspSample:MyCustomOption optionid="option2" value="2"/>
<aspSample:MyCustomOption optionid="option3" value="3"/>
</aspSample:CustomHtmlSelectWithHttpParseException>
</form>
</body>
</html>
<%@ Page Language="VB"%>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB" Assembly="Samples.AspNet.VB" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HttpParseException Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>HttpParseException Example</h3>
<aspSample:CustomHtmlSelectWithHttpParseException
id="customhtmlselect1"
runat="server">
<aspSample:MyCustomOption optionid="option1" value="1"/>
<aspSample:MyCustomOption optionid="option2" value="2"/>
<aspSample:MyCustomOption optionid="option3" value="3"/>
</aspSample:CustomHtmlSelectWithHttpParseException>
</form>
</body>
</html>
using System;
using System.Security.Permissions;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace Samples.AspNet.CS
{
// Define a child control for the custom HtmlSelect.
public class MyCustomOption
{
string _id;
string _value;
public string optionid
{
get
{ return _id; }
set
{ _id = value; }
}
public string value
{
get
{ return _value; }
set
{ _value = value; }
}
}
// Define a custom HtmlSelectBuilder.
public class MyHtmlSelectBuilderWithparseException : HtmlSelectBuilder
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public override Type GetChildControlType(string tagName, IDictionary attribs)
{
// Distinguish between two possible types of child controls.
if (tagName.ToLower().EndsWith("mycustomoption"))
{
return typeof(MyCustomOption);
}
else
{
throw new HttpParseException("This custom HtmlSelect control" + "requires child elements of the form \"MyCustomOption\"");
}
}
}
[ControlBuilderAttribute(typeof(MyHtmlSelectBuilderWithparseException))]
public class CustomHtmlSelectWithHttpParseException : HtmlSelect
{
// Override the AddParsedSubObject method.
protected override void AddParsedSubObject(object obj)
{
string _outputtext;
if (obj is MyCustomOption)
{
_outputtext = "custom select option : " + ((MyCustomOption)obj).value;
ListItem li = new ListItem(_outputtext, ((MyCustomOption)obj).value);
base.Items.Add(li);
}
}
}
}
Imports System.Security.Permissions
Imports System.Collections
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.HtmlControls
Namespace Samples.AspNet.VB
' Define a child control for the custom HtmlSelect.
Public Class MyCustomOption
Private _id As String
Private _value As String
Public Property optionid() As String
Get
Return _id
End Get
Set(ByVal value As String)
_id = value
End Set
End Property
Public Property value() As String
Get
Return _value
End Get
Set(ByVal value As String)
_value = value
End Set
End Property
End Class
' Define a custom HtmlSelectBuilder.
Public Class MyHtmlSelectBuilderWithparseException
Inherits HtmlSelectBuilder
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public Overrides Function GetChildControlType(ByVal tagName As String, ByVal attribs As IDictionary) As Type
' Distinguish between two possible types of child controls.
If tagName.ToLower().EndsWith("mycustomoption") Then
Return GetType(MyCustomOption)
Else
Throw New HttpParseException("This custom HtmlSelect control" & _
"requires child elements of the form ""MyCustomOption""")
End If
End Function
End Class
<ControlBuilderAttribute(GetType(MyHtmlSelectBuilderWithparseException))> _
Public Class CustomHtmlSelectWithHttpParseException
Inherits HtmlSelect
' Override the AddParsedSubObject method.
Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)
Dim _outputtext As String
If TypeOf obj Is MyCustomOption Then
_outputtext = "custom select option : " + CType(obj, MyCustomOption).value
Dim li As New ListItem(_outputtext, CType(obj, MyCustomOption).value)
MyBase.Items.Add(li)
End If
End Sub
End Class
End Namespace
Remarks
The HttpParseException class is an HTTP-specific exception class that enables ASP.NET to output parser exception information. For more information on throwing and handling exceptions, see Exceptions.
Constructors
| HttpParseException() |
Initializes a new instance of the HttpParseException class. |
| HttpParseException(String) |
Initializes a new instance of the HttpParseException class with a specified error message. |
| HttpParseException(String, Exception) |
Initializes a new instance of the HttpParseException class with a specified error message and a reference to the inner. |
| HttpParseException(String, Exception, String, String, Int32) |
Initializes a new instance of the HttpParseException class with specific information about the source code being compiled and the line number on which the exception occurred. |
Properties
| Data |
Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception) |
| ErrorCode |
Gets the |
| FileName |
Gets the name of the file being parsed when the error occurs. |
| HelpLink |
Gets or sets a link to the help file associated with this exception. (Inherited from Exception) |
| HResult |
Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception) |
| InnerException |
Gets the Exception instance that caused the current exception. (Inherited from Exception) |
| Line |
Gets the number of the line being parsed when the error occurs. |
| Message |
Gets a message that describes the current exception. (Inherited from Exception) |
| ParserErrors |
Gets the parser errors for the current exception. |
| Source |
Gets or sets the name of the application or the object that causes the error. (Inherited from Exception) |
| StackTrace |
Gets a string representation of the immediate frames on the call stack. (Inherited from Exception) |
| TargetSite |
Gets the method that throws the current exception. (Inherited from Exception) |
| VirtualPath |
Gets the virtual path to source file that generated the error. |
| WebEventCode |
Gets the event codes that are associated with the HTTP exception. (Inherited from HttpException) |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetBaseException() |
When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception) |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetHtmlErrorMessage() |
Gets the HTML error message to return to the client. (Inherited from HttpException) |
| GetHttpCode() |
Gets the HTTP response status code to return to the client. (Inherited from HttpException) |
| GetObjectData(SerializationInfo, StreamingContext) |
When overridden in a derived class, sets the SerializationInfo object with information about the exception. |
| GetObjectData(SerializationInfo, StreamingContext) |
Gets information about the exception and adds it to the SerializationInfo object. (Inherited from HttpException) |
| GetType() |
Gets the runtime type of the current instance. (Inherited from Exception) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() |
Returns a string that contains the HRESULT of the error. (Inherited from ExternalException) |
Events
| SerializeObjectState |
Obsolete.
Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception) |
