c# validate ean 13 Creating Serviced Components in C#.NET

Creation EAN 13 in C#.NET Creating Serviced Components

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Creating Serviced Components
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3. Which options are valid ways to register a serviced component (Choose all that apply.) A. Command line:
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sn.exe k myassembly.dll
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B. Command line:
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regsvcs.exe myassembly.dll AppName
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C. Create an application folder in C:\Program Files\ComPlus and drag MyAs sembly.dll into this folder. D. Create an application node in the Component Services management con sole and drag MyAssembly.dll onto this node.
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Lesson 2: Consuming the Serviced Component
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Lesson 2: Consuming the Serviced Component
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In this lesson you learn how to consume a serviced component by creating an appli cation that references an assembly that contains a serviced component and accessing methods and properties on the serviced component. You continue where Lesson 1 finished.
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After this lesson, you will be able to:
Create an application that consumes a serviced component. Access methods, properties, and events on a serviced component.
Estimated lesson time: 25 minutes
Referencing the Assembly that Contains the Component
In Lesson 1 you learned how to create and register a serviced component. Moving for ward, we now want to create an application that consumes the services on the ser viced component. The first step in this process in creating a reference to the serviced component. This is actually a pretty straightforward process. You create the reference as you would any other reference to an external assembly. Let s assume you ve just added a console application named MSLearning.12.Con soleClient to our existing solution and from this application we want to consume the AdventureWorks OrderService created in Lesson 1. Click Project, Add Reference, and then click MSLearning.12.Services.dll from the Projects tab. Alternatively, if you created a new solution, you would browse for MSLearning.12.Services.dll. Now because MSLearning.12.Services.dll references System.EnterpriseServices.dll, and this is not a default reference, we also need to add a reference to System.EnterpriseServices.dll from our console application. A serviced component reference is created just as you would create any other reference. Now it is important to note that because MSLearning.12.Services.dll is a strongnamed assembly, the reference you create to this assembly is also very specific. Chang ing the version number of the assembly and redeploying MSLearning.12.Ser vices.dll means that you break the reference. This broken reference can be solved by
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Creating Serviced Components
recompiling the console application against the new version of MSLearn ing.12.Services.dll or by using a policy that redirects the binding. The imple mentation of policies is outside the scope of this chapter, but you should be aware that it is an option.
Queued Components
Referencing queued components works a little differently. The underlying technology of message queues is not covered until 13, when we return to how to con sume a queued component.
Declaring and Instantiating the Component
Having created a reference to the assembly, you are now ready to declare and instan tiate the serviced component. Again, as the following code shows, there is little magic involved. Create an instance of the serviced component as if it were any other class, call SubmitOrder, telling it customer 10 wants to order 5 articles with the article ID 255. If successful, your display shows the orderId; if an exception occurs, you display the exception.
'VB Imports System Imports MSLearning.12.Services Namespace MSLearning.12.ConsoleClient
Public Class Program
Sub Main() Dim os As OrderService = New OrderService() Console.WriteLine("Serviced Component is created.") Console.ReadKey() End Sub
End Class
End Namespace
//C# using System; using MSLearning.12.Services; namespace MSLearning.12.ConsoleClient {
class Program
static void Main(string[] args) {
OrderService os = new OrderService();
Lesson 2: Consuming the Serviced Component
Console.WriteLine( Serviced Component is created. );
Console.ReadKey();
Access Properties, Methods, and Events of the Component
After creating an instance of the OrderService, you want to add code to call SubmitOrder, telling it customer 10 wants to order 5 articles with the article ID 255. If suc cessful, your display shows the orderId; if an exception occurs, you display the exception.
'VB Imports System Imports MSLearning.12.Services Namespace MSLearning.12.ConsoleClient
Public Class Program
Sub Main()
Try Dim os As OrderService = New OrderService() Console.WriteLine("Serviced Component is created.") Console.ReadKey() Catch ex As Exception
Console.WriteLine("An error occured: " + ex.Message)
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