Serviced Components in VS .NET

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Version 1.1 of the .NET Framework introduces a new feature that lets regular clients take advantage of the many features of COM+ 1.5 running under Windows Server 2003 for example, automatic transactions, pooling, and synchronization without creating a ser viced component that has been previously registered in the COM+ catalog. You leverage the Services Without Components feature by invoking the Enter shared method of the ServiceDomain class. This method takes a ServiceConfig object, which serves to configure all the characteristics of the COM+ context to be created on the fly:
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(In the client application...)
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Dim sc As New ServiceConfig
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Set transaction properties.
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sc.Transaction = TransactionOption.Required
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sc.IsolationLevel = TransactionIsolationLevel.Serializable
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sc.TransactionTimeout = 60 One minute
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sc.Synchronization = SynchronizationOption.Required Not really necessary
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Prepare values for tracking purposes only.
sc.TrackingAppName = ServicesWithoutComponentsDemo"
sc.TrackingComponentName = UpdateAccounts"
sc.TrackingEnabled = True
sc.TransactionDescription = UpdateAccounts Transaction"
Create the COM+ context.
ServiceDomain.Enter(sc)
Do your transactional work here.
UpdateAccount(1)
UpdateAccount(2)
Complete the transaction and display its outcome.
Dim status As TransactionStatus = ServiceDomain.Leave()
MsgBox( Transaction Status = & status.ToString)
Notice that it s up to the client to correctly pair the calls to the Enter and Leave methods of the ServiceDomain class.
Components as Web Services
COM+ 1.5 provides a great way to simplify the migration of existing COM and COM+ applications toward the .NET platform, by allowing components to be exposed as Web services. As with most COM+ services, you can leverage this feature either from inside the MMC snap-in or via code. To manually expose a COM+ server application as a Web service, you just select the Uses SOAP check box on the Activation tab of the application s Properties window and type a name of a virtual directory in the SOAP VRoot field. This action creates a phys ical directory named C:\Windows\System32\Com\SoapVRoots\vrootname (where vrootname is the name you have typed) and exposes it as a virtual directory named vrootname under the root directory for the IIS default Web site. Additionally, COM+
Part VII:
Advanced Topics
creates a few files that are necessary for the Web service to work correctly: a Web.config file, a default.disco file, and a default.aspx file that returns the WSDL for the Web service. If the component had been created with a .NET language, the assembly is registered in the GAC; otherwise, a .NET interoperability assembly is created in the new directory. To expose a serviced component as a Web service via code, you must add a SoapVRoot argument to the ApplicationActivation attribute. The value of this argument is the name of the virtual directory.
<assembly: ApplicationActivation(ActivationOption.Server, SoapVRoot:="BankApp">
You can then test all the methods in the component by creating a client that adds a ref erence to the Web service, as you would do with regular Web services. You can sim plify the test phase by clearing the Enforce Access Checks For This Application check box on the Security tab of the application s Properties window. Remote clients don t necessarily have to reach the component via SOAP, as they can continue to use the component as if it were a regular COM+ component. However, the protocol used by remote clients depends on whether the Uses SOAP check box was selected when the application was exported to create the proxy. If SOAP was enabled, calls from the remote client use the SOAP protocol and flow over HTTP on port 80; if SOAP was disabled, remote calls use RPC and DCOM protocols.
Note
The Uses SOAP check box is disabled by default under Windows Server 2003. To enable it, you must display the Security tab of the application s Properties window, deselect the Enforce access checks for this application option and select None in the Authentication level for calls, and then click OK to close the window. Next, reopen the Properties window and display the Activation tab, where you ll see that the Uses Soap check box is now enabled. Also note that regardless of the operating system you re using, you ll have problems pass ing and returning complex .NET types such as DataSets. For this reason, you might consider the ability to expose COM+ components as a Web service mainly a quick and simple way to reuse your legacy COM+ components for .NET clients.
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