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CustomError Class

Configures a CustomError section to map an ASP.NET error code to a custom page. This class cannot be inherited.

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

public sealed class CustomError : ConfigurationElement

The CustomError type exposes the following members.

  NameDescription
Public methodCustomErrorInfrastructure. Initializes a new instance of the CustomError class.
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  NameDescription
Public propertyCurrentConfigurationGets a reference to the top-level Configuration instance that represents the configuration hierarchy that the current ConfigurationElement instance belongs to. (Inherited from ConfigurationElement.)
Public propertyElementInformationGets an ElementInformation object that contains the non-customizable information and functionality of the ConfigurationElement object. (Inherited from ConfigurationElement.)
Protected propertyElementPropertyGets the ConfigurationElementProperty object that represents the ConfigurationElement object itself. (Inherited from ConfigurationElement.)
Protected propertyItem[ConfigurationProperty]Gets or sets a property or attribute of this configuration element. (Inherited from ConfigurationElement.)
Protected propertyItem[String]Gets or sets a property, attribute, or child element of this configuration element. (Inherited from ConfigurationElement.)
Public propertyLockAllAttributesExceptGets the collection of locked attributes. (Inherited from ConfigurationElement.)
Public propertyLockAllElementsExceptGets the collection of locked elements. (Inherited from ConfigurationElement.)
Public propertyLockAttributesGets the collection of locked attributes (Inherited from ConfigurationElement.)
Public propertyLockElementsGets the collection of locked elements. (Inherited from ConfigurationElement.)
Public propertyLockItemGets or sets a value indicating whether the element is locked. (Inherited from ConfigurationElement.)
Protected propertyPropertiesGets the collection of properties. (Inherited from ConfigurationElement.)
Public propertyRedirectGets or sets the redirection URL.
Public propertyStatusCodeGets or sets the HTTP error status code.
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  NameDescription
Protected methodDeserializeElementReads XML from the configuration file. (Inherited from ConfigurationElement.)
Public methodEqualsCompares CustomError errors. (Overrides ConfigurationElement.Equals(Object).)
Public methodGetHashCodeGets the CustomError object hash code. (Overrides ConfigurationElement.GetHashCode().)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodInitSets the ConfigurationElement object to its initial state. (Inherited from ConfigurationElement.)
Protected methodInitializeDefaultUsed to initialize a default set of values for the ConfigurationElement object. (Inherited from ConfigurationElement.)
Protected methodIsModifiedIndicates whether this configuration element has been modified since it was last saved or loaded, when implemented in a derived class. (Inherited from ConfigurationElement.)
Public methodIsReadOnlyGets a value indicating whether the ConfigurationElement object is read-only. (Inherited from ConfigurationElement.)
Protected methodResetResets the internal state of the ConfigurationElement object, including the locks and the properties collections. (Inherited from ConfigurationElement.)
Protected methodResetModifiedResets the value of the IsModified method to false when implemented in a derived class. (Inherited from ConfigurationElement.)
Protected methodSerializeElementWrites the contents of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement.)
Protected methodSerializeToXmlElementWrites the outer tags of this configuration element to the configuration file when implemented in a derived class. (Inherited from ConfigurationElement.)
Protected methodSetReadOnlySets the IsReadOnly property for the ConfigurationElement object and all subelements. (Inherited from ConfigurationElement.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Protected methodUnmergeModifies the ConfigurationElement object to remove all values that should not be saved. (Inherited from ConfigurationElement.)
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The CustomError class provides a way to programmatically access and modify the error section of a configuration file. This type is part of a group that includes the CustomErrorCollection, CustomErrorsMode, and CustomErrorsSection.

NoteNote

When you define a custom error, ASP.NET assigns to it the standard error normally issued by the underlying service, such as IIS. For instance, if you define a custom error for the status code 404, ASP.NET will issue it anytime you refer to a non-existing .aspx page. The custom errors are only issued for those elements handled by ASP.NET. For instance, if you refer to a non-existing .htm page, IIS issues the standard 404 error.

This example demonstrates how to specify values declaratively for several attributes of the customErrors section, which can also be accessed as members of the CustomError class.

The following configuration file example shows how to specify values declaratively for the customErrors section.

<customErrors mode="RemoteOnly"
  defaultRedirect="customerror.htm">
    <error statusCode="404" redirect="customerror404.htm"/>
</customErrors>

The following code example demonstrates how to use the CustomError class.


            // Get the Web application configuration.
            Configuration configuration =
                WebConfigurationManager.OpenWebConfiguration(
                "/aspnetTest");

            // Get the section.
            CustomErrorsSection customErrors =
                (CustomErrorsSection)configuration.GetSection(
              "system.web/customErrors");

            // Get the collection.
            CustomErrorCollection customErrorsCollection =
                customErrors.Errors;

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

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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