When overridden in a derived class, specifies a SOAP extension should run with an XML Web service method.
Assembly: System.Web.Services (in System.Web.Services.dll)
Thetype exposes the following members.
|ExtensionType||When overridden in a derived class, gets the Type of the SOAP extension.|
|Priority||When overridden in a derived class, gets or set the priority of the SOAP extension.|
|TypeId||When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)|
|Equals||Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for this instance. (Inherited from Attribute.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|IsDefaultAttribute||When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)|
|Match||When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|_Attribute.GetIDsOfNames||Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)|
|_Attribute.GetTypeInfo||Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)|
|_Attribute.GetTypeInfoCount||Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)|
|_Attribute.Invoke||Provides access to properties and methods exposed by an object. (Inherited from Attribute.)|
XML Web service methods created using ASP.NET can be configured to run with a SOAP extension by applying an attribute to the XML Web service method. When a custom extension attribute is added to an XML Web service method or a method on a client proxy class, ASP.NET invokes the associated extension at the appropriate time. An extension attribute is a custom attribute class deriving from . Derived attributes must override the ExtensionType property to return the type of extension that is associated with the attribute.
The following TraceExtensionAttribute class derives from to support applying the attribute to an XML Web service method or a method in an XML Web service client proxy class. When applied to either, the TraceExtension SOAP extension runs with the method.
' Create a SoapExtensionAttribute for a SOAP extension that can be ' applied to an XML Web service method. <AttributeUsage(AttributeTargets.Method)> _ Public Class TraceExtensionAttribute Inherits SoapExtensionAttribute Private m_filename As String = "c:\log.txt" Private m_priority As Integer ' Return the type of 'TraceExtension' class. Public Overrides ReadOnly Property ExtensionType() As Type Get Return GetType(TraceExtension) End Get End Property ' User can set priority of the 'TraceExtension'. Public Overrides Property Priority() As Integer Get Return m_priority End Get Set(ByVal Value As Integer) m_priority = value End Set End Property Public Property Filename() As String Get Return m_filename End Get Set(ByVal Value As String) m_filename = value End Set End Property End Class