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HttpParseException Class

The exception that is thrown when a parse error occurs.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

[SerializableAttribute]
public sealed class HttpParseException : HttpException

The HttpParseException type exposes the following members.

  NameDescription
Public methodHttpParseException()Initializes a new instance of the HttpParseException class.
Public methodHttpParseException(String)Initializes a new instance of the HttpParseException class with a specified error message.
Public methodHttpParseException(String, Exception)Initializes a new instance of the HttpParseException class with a specified error message and a reference to the inner.
Public methodHttpParseException(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.
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  NameDescription
Public propertyDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertyErrorCodeGets the HRESULT of the error. (Inherited from ExternalException.)
Public propertyFileNameGets the name of the file being parsed when the error occurs.
Public propertyHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public propertyHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertyInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertyLineGets the number of the line being parsed when the error occurs.
Public propertyMessageGets a message that describes the current exception. (Inherited from Exception.)
Public propertyParserErrorsGets the parser errors for the current exception.
Public propertySourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertyStackTraceGets a string representation of the immediate frames on the call stack. (Inherited from Exception.)
Public propertyTargetSiteGets the method that throws the current exception. (Inherited from Exception.)
Public propertyVirtualPathGets the virtual path to source file that generated the error.
Public propertyWebEventCodeGets the event codes that are associated with the HTTP exception. (Inherited from HttpException.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetHtmlErrorMessageGets the HTML error message to return to the client. (Inherited from HttpException.)
Public methodGetHttpCodeGets the HTTP response status code to return to the client. (Inherited from HttpException.)
Public methodGetObjectDataWhen overridden in a derived class, sets the SerializationInfo object with information about the exception. (Overrides HttpException.GetObjectData(SerializationInfo, StreamingContext).)
Public methodGetTypeGets the runtime type of the current instance. (Inherited from Exception.)
Public methodToStringReturns a string that contains the HRESULT of the error. (Inherited from ExternalException.)
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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 Handling and Throwing Exceptions.

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>
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);
            }
        }      
    }

}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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