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WebService Class

Defines the optional base class for XML Web services, which provides direct access to common ASP.NET objects, such as application and session state.

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

'Declaration
Public Class WebService _
	Inherits MarshalByValueComponent
'Usage
Dim instance As WebService

If you don't need access to the common ASP.NET objects, you can still create an XML Web service without deriving from WebService. Additional ASP.NET objects can be accessed through Context.

XML Web service methods that have the OneWay property of either SoapRpcMethodAttribute or SoapDocumentMethodAttribute set to true, do not have access to their HttpContext. As such, accessing any of the properties of the WebService class, from within that XML Web service method, return Nothing.

If you are using the .NET Framework version 1.0 XML Web service methods that have either the SoapRpcMethodAttribute or SoapDocumentMethodAttribute attribute applied to them with the OneWay property of set to true, do not have access to their HttpContext using the static Current property. To access the HttpContext, derive the class implementing the XML Web service method from WebService and access the Context property.

TopicLocation
Walkthrough: Creating and Using an ASP.NET Web Service in Visual Web DeveloperBuilding ASP .NET Web Applications in Visual Studio

The example below creates an XML Web service, deriving from WebService, in order to use the Context property to obtain the time of the request on the server.

<%@ WebService Language="VB" Class="Util" %>

Imports System
Imports System.Web.Services

Public Class Util
    Inherits WebService

    <WebMethod(Description := "Returns the time as stored on the Server", _
        EnableSession := False)> _
    Public Function Time() As String 

        Return Context.Timestamp.TimeOfDay.ToString()
    End Function 
End Class

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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