code to generate barcode in vb.net Call a remoting method. Call a remoting method asynchronously. Use events with remote objects. in C#

Drawing UPC - 13 in C# Call a remoting method. Call a remoting method asynchronously. Use events with remote objects.

Call a remoting method. Call a remoting method asynchronously. Use events with remote objects.
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Estimated lesson time: 20 minutes
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8
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Method Invocations and Event Management with .NET Remoting
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Calling a Remoting Method Synchronously
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In most cases, developers create classes and use those classes to create objects. A sim ple Person class with a FirstName method and a LastName method might look some thing like the following code:
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'VB Sub ShowNormalInstantiation()
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Dim SomePerson As New Person()
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Console.WriteLine(SomePerson.LastName() + ", " + _
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SomePerson.FirstName())
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End Sub
//C# static void ShowNormalInstantiation() {
Person SomePerson = new Person();
Console.WriteLine(SomePerson.LastName() + ", " +
SomePerson.FirstName());
Depending on the exact approach you are using to create a given remote object, the invocation might look something like the following:
'VB Sub Main()
RemotingConfiguration.Configure("StandardClient.exe.config", False)
Dim person As IPerson = _
CType(Activator.GetObject(GetType(IPerson), _
"tcp://localhost:9000/Person.rem"), IPerson)
Console.WriteLine(person.LastName() & ", " & person.FirstName())
End Sub
//C# static void Main(string[] args) {
RemotingConfiguration.Configure("StandardClient.exe.config", false);
IPerson person = (IPerson)Activator.GetObject(typeof(IPerson),
@"tcp://localhost:9000/Person.rem");
Console.WriteLine(person.LastName() + ", " + person.FirstName());
The output for the preceding code should approximate that in Figure 8-1.
Lesson 1: Calling Remoting Methods
Figure 8-1
Console output of call to LastName and FirstName
The preceding example is just one way to create a remote object, and how an object is created isn t really important to knowing how to invoke methods off of it. After the remote object is created, calls to its methods are identical, irrespective of how the object is instantiated (client-activated or server-activated instantiation). Hence, as far as the actual method call is concerned, there is no syntactical difference between local and remote calls. Although syntactically remote method calls might look no different from their nonre mote counterparts, operationally and architecturally they are very different. Accord ingly, there is an issue with the preceding code that the developer should be aware of. Notice that there is a call to both the FirstName method and the LastName method. As you might now realize, these calls, even if combined on one line as they are in this example, require two trips to the server. This fact greatly complicates traditional object-oriented usage because now referencing these two methods is not necessarily a trivial endeavor. The following issues arise here:
If you wrap the entire line in a try/catch block, the first call might succeed and the second call might fail. This situation requires more involved exception man agement and logging to be performed on the client so that the nature of any problems can be accurately discerned. Instead of calling the two methods, it might be preferable to add another method to the class that performs the concatenation on the server instead of on the client. However, this preference isn t always the case. After all, if you rarely use the methods in a combined format, you might just be adding unnecessary or confusing logic to your design. Good design in a nonremoting environment might make for a terrible design in a remoting environment and vice versa. (This situation is often the case, partic ularly with respect to events, which are discussed later.)
8
Method Invocations and Event Management with .NET Remoting
Stateless Invocation Using One-Way Calls
Precisely because so many different things can go wrong when calling remote meth ods, you need to take much care in handling and responding to exceptions. Yet there are many times when a decision is made that something should be called in a fire and forget method. That effectively means that irrespective of what happens on the server side, processing should neither be delayed nor fail due to an exception. To provide this behavior, the System.Runtime.Remoting.Messaging namespace provides the OneWay attribute. The behavior that this attribute causes is functionally identical to the behavior observed when the OneWay attribute is used in a Web method. The following are the modifications to the IPerson interface and the Person class that are necessary to use the OneWay attribute:
'VB Public Interface IPerson
<OneWay()> _
Function FirstName() As String
<OneWay()> _
Function LastName() As String
End Interface Public Class Person
Inherits MarshalByRefObject
Implements IPerson
<OneWay()> _
Public Function FirstName() As String _
Implements Interfaces.IPerson.FirstName Throw New ArgumentException("Intentionally thrown exception") End Function <OneWay()> _
Public Function LastName() As String Implements _
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