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BaseAddressPrefixFilterElement Class
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BaseAddressPrefixFilterElement Class

Represents a configuration element that specifies a pass through filter, which provides a mechanism to pick the appropriate IIS bindings when hosting a Windows Communication Foundation (WCF) application in IIS. This class cannot be inherited.


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

public sealed class BaseAddressPrefixFilterElement : ConfigurationElement

The BaseAddressPrefixFilterElement type exposes the following members.

Public methodBaseAddressPrefixFilterElement()Initializes a new instance of the BaseAddressPrefixFilterElement class.
Public methodBaseAddressPrefixFilterElement(Uri)Initializes a new instance of the BaseAddressPrefixFilterElement class with a specific URI.

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.)
Public propertyPrefixGets or sets a prefix that is used to match a part of a base address.
Protected propertyPropertiesGets the collection of properties. (Inherited from ConfigurationElement.)

Protected methodDeserializeElementReads XML from the configuration file. (Inherited from ConfigurationElement.)
Public methodEqualsCompares the current ConfigurationElement instance to the specified object. (Inherited from ConfigurationElement.)
Public methodGetHashCodeGets a unique value representing the current ConfigurationElement instance. (Inherited from ConfigurationElement.)
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.)

A prefix filter provider a mechanism for a service to bind to a specific URI .It enables you to host multiple applications with different base addresses for the same scheme on the same site.

IIS websites are containers for virtual applications which contain virtual directories. The application in a site can be accessed through one or more IIS binding. IIS bindings provide two pieces of information: binding protocol and binding information. Binding protocol (e.g., HTTP) defines the scheme over which communication occurs, and binding information (e.g., IPAddress, Port, Hostheader) contains data used to access the site.

IIS supports specifying multiple IIS bindings per site, which results in multiple base addresses per scheme. Since a WCF service hosted under a site allows binding to only one base address per scheme, you can use the prefix filter feature to pick the required base address of the hosted service. The incoming base addresses, supplied by IIS, are filtered based on the optional prefix list filter.

For example, your site can contain the following base addresses


You can use the following configuration file to specify a prefix filter at the appdomain level.

        <add prefix=”net.tcp://test1.fabrikam.com:8000”/>
        <add prefix=”http://test2.fabrikam.com:9000”/>

In this example, net.tcp://test1.fabrikam.com:8000 and http://test2.fabrikam.com:9000 are the only base addresses for their respective schemes which are allowed to be passed through.

By default, when prefix is not specified, all addresses are passed through. Specifying the prefix will result in only the matching base address for that scheme to be passed through.


The filter does not support any wildcards. In addition, the baseAddresses supplied by IIS may have addresses bound to other schemes not present in the baseAddressPrefixFilters list. These addresses are not filtered out.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5 SP1, 3.0 SP1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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