SoapHeaderAttribute Class

Definition

Namespace:

System.Web.Services.Protocols

Assembly:

System.Web.Services.dll

This attribute is applied to an XML Web service method or an XML Web service client to specify a SOAP header that the XML Web service method or XML Web service client can process. This class cannot be inherited.

public ref class SoapHeaderAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method, AllowMultiple=true)]
public sealed class SoapHeaderAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method, AllowMultiple=true)>]
type SoapHeaderAttribute = class
    inherit Attribute

Public NotInheritable Class SoapHeaderAttribute
Inherits Attribute

Inheritance

Object

Attribute

SoapHeaderAttribute

Attributes

AttributeUsageAttribute

Examples

The following MyWebService XML Web service defines one SoapHeader of type MyHeader. The Hello XML Web service method requires the client to invoke the XML Web service method with this SoapHeader. The Hello XML Web service also catches any SOAP headers other than MyHeader.

<%@ WebService Language="C#" Class="MyWebService"%>
using System.Web.Services;
using System.Web.Services.Protocols;

// Define a SOAP header by deriving from the SoapHeader base class.
// The header contains just one string value.
public class MyHeader : SoapHeader {
    public string MyValue;
}

public class MyWebService {
    // Member variable to receive the contents of the MyHeader SoapHeader.
    public MyHeader myHeader;

    // Member variable to receive all headers other than MyHeader.
    public SoapUnknownHeader[] unknownHeaders;
 
    [WebMethod]
    [SoapHeader("myHeader", Direction=SoapHeaderDirection.InOut)]

    // Receive any SOAP headers other than MyHeader.
    [SoapHeader("unknownHeaders")]
    public void Hello() {

       // Process the MyHeader SoapHeader.
       if (myHeader.MyValue == "Some string") {
          // Process the header.
       }
       foreach (SoapHeader header in unknownHeaders) {
           // Perform some processing on header.
           
           // For those headers that cannot be processed,
           // set the DidUnderstand property to false.
           header.DidUnderstand = false;
       }
    }
}

<%@ WebService Language="VB" Class="MyWebService"%>
Imports System.Web.Services
Imports System.Web.Services.Protocols

' Define a SOAP header by deriving from the SoapHeader base class.
' The header contains just one string value.
Public Class MyHeader
    Inherits SoapHeader
    Public MyValue As String
End Class

Public Class MyWebService
    ' Member variable to receive the contents of the MyHeader SoapHeader.
    Public myHeader As MyHeader
    
    ' Member variable to receive all headers other than MyHeader.
    Public unknownHeaders() As SoapUnknownHeader
    
    ' Receive any SOAP headers other than MyHeader.
    <WebMethod, _
        SoapHeader("myHeader", Direction := SoapHeaderDirection.InOut), _
        SoapHeader("unknownHeaders")> _
    Public Sub Hello()        
        
        ' Process the MyHeader SoapHeader.
        If myHeader.MyValue = "Some string" Then
            ' Process the header.
        End If 
        Dim header As SoapHeader
        For Each header In  unknownHeaders
            ' Perform some processing on header
            ' For those headers that cannot be processed, 
            ' set the DidUnderstand to false.
            header.DidUnderstand = False
        Next header
    End Sub
End Class

Remarks

The basic steps to receiving and processing a SOAP header are:

1. Create a class deriving from SoapHeader representing the data passed in the SOAP header.

2. Add a member to the XML Web service class or XML Web service client proxy class of the type created in step 1.

3. Apply a SoapHeaderAttribute to the XML Web service method or the corresponding method in the proxy class, specifying the member created in step 2 in the MemberName property.

4. Within the XML Web service method or XML Web service client code, access the MemberName property to process the data sent in the SOAP header.

For more details, see the MemberName property.

Constructors

SoapHeaderAttribute(String)

Initializes a new instance of the SoapHeaderAttribute class, setting the member of the XML Web service class representing the SOAP header contents.

Properties

Direction	Gets or sets whether the SOAP header is intended for the XML Web service or the XML Web service client or both.
MemberName	Gets or sets the member of the XML Web service class representing the SOAP header contents.
Required	Obsolete. This member is obsolete and has no functionality.
TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
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(Object)	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)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)

See also

• MemberName
• SoapHeader