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Public Class CQuoteMgmt Inherits SoapHttpClientProtocol <SoapDocumentMethod( _ "http://LearnXmlWScom/Supplier/GetPriceQuote", _ RequestNamespace:="http://LearnXmlWScom/Supplier", _ ResponseNamespace:="http://LearnXmlWScom/Supplier")> _ Public Function GetPriceQuote(ByVal newOrder As InterfaceClientOrder) _ As InterfaceClientQuoteInfo() Dim results() As Object = MeInvoke("GetPriceQuote", _ New Object() {newOrder}) Return CType(results(0), QuoteInfo()) End Function End Class
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I specifically renamed the classes to begin with a C to make it clear that these are classes and not interfaces The first class, COrderMgmt, represents the IOrderMgmt binding as indicated by its WebServiceBinding attribute The class inherits from SoapHttpClientProtocl and adds two methods, PlaceOrder and CheckStatus each with a SoapDocumentMethod attribute that defines the request and response namespaces as defined in the WSDL Similarly, the second class, CQuoteMgmt, represents the IQuoteMgmt binding It also inherits from SoapHttpClientProtocol and adds a function called GetPriceQuote as defined in the WSDL The classes in listing 8-13 are definitely good enough for the client to call the service based on the two interfaces IOrderMgmt and IQuoteMgmt However, some developers might want to take it a step further and program against interfaces, instead of classes, on the client side Unfortunately, WebServiceBinding cannot be applied to interfaces One way around this is to manually define two interfaces on the client side called IOrderMgmt and IQuoteMgmt as shown in listing 8-14 Listing 8-14 Defining interfaces on the client side then creating a class that implements these interfaces and forward method calls to the Web service proxy classes (VBWSClientCode\8 \Interfaces\InterfaceClient\Supplier3vb)
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Interface IOrderMgmt Function PlaceOrder(ByVal newOrder As Order) As String Function CheckStatus(ByVal OrderId As String) As OrderInfo End Interface Interface IQuoteMgmt Function GetPriceQuote(ByVal newOrder As Order) As QuoteInfo() End Interface Public Class SupplierProxy Implements IOrderMgmt Implements IQuoteMgmt Private _ordermgmt As COrderMgmt Private _quotemgmt As CQuoteMgmt Public Function CheckStatus(ByVal OrderId As String) As OrderInfo _ Implements InterfaceClientIOrderMgmtCheckStatus Return _ordermgmtCheckStatus(OrderId) End Function Public Function PlaceOrder(ByVal newOrder As Order) As String _ Implements InterfaceClientIOrderMgmtPlaceOrder Return _ordermgmtPlaceOrder(newOrder) End Function
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Public Function GetPriceQuote(ByVal newOrder As Order) As QuoteInfo() _ Implements InterfaceClientIQuoteMgmtGetPriceQuote Return _quotemgmtGetPriceQuote(newOrder) End Function Public Sub New(ByVal Url As String) _ordermgmt = New COrderMgmt() _quotemgmt = New CQuoteMgmt() _ordermgmtUrl = Url _quotemgmtUrl = Url End Sub End Class
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Each interface includes methods of the corresponding binding as defined in the WSDL document A class, called SupplierProxy, implements both interfaces and contains instances of COrderMgmt and CQuoteMgmt You could build the code in listing 8-14 in a separate dll and distribute to client developers as a prepackaged interface-based proxy for your Web service This would be valuable if you are responsible for maintaining the Web service and the proxy classes and you want to abstract client developers from the details of your Web service s interface Listing 8-15 shows example client code that is designed to work against the interfaces IOrderMgmt and IQuoteMgmt Listing 8-15 An example client that works against the interfaces not the Web service proxy (VBWSClientCode\8\Interfaces\InterfaceClient\Form1vb)
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Private Const SERVICE_URL As String = _ "http://VBWSServer/vbwsbook/8/Supplier3asmx" Private Sub btnPlaceOrder_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles btnPlaceOrderClick Dim ws As IOrderMgmt ws = New SupplierProxy(SERVICE_URL) wsPlaceOrder(MakeOrder()) End Sub Private Sub btnQuote_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles btnQuoteClick Dim ws As IQuoteMgmt ws = New SupplierProxy(SERVICE_URL) wsGetPriceQuote(MakeOrder()) End Sub
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To invoke the methods of the IOrderMgmt binding, the client declares a variable of type IOrderMgmt then sets it to a new instance of SupplierProxy and proceed to call PlaceOrder or CheckStatus Similarly, to call methods of IQuoteMgmt, the client declares a variable of type IQuoteMgmt and sets it to a new instance of SupplierProxy and calls GetPriceQuote The code in listing 8-15 makes it very clear that the client is programmed against an interface not a specific implementation However, there s still one glaring problem with this code: The Web servie URL, which is the location of a specific implementation of IOrderMgmt and IQuoteMgmt, is hard coded as a constant The next sections deal with determining the Web service URL at run time based on external configuration settings
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