print barcode in crystal report c# Figure 8-20. The output of the intermediary server in VB.NET

Generation QR in VB.NET Figure 8-20. The output of the intermediary server

Figure 8-20. The output of the intermediary server
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Now create a new version of your Person object with two additional properties, birth date and additional comments. The new version will be used only by the client and the back-end server. The intermediary still uses the old version of the Person object.
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For testing the applications with the different versions of the shared assembly, I have created a separate Tip
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directory for each version of the shared assembly. Each application references the assembly from the directory where the corresponding version of the shared assembly is located. This means for this sample I have created a subdirectory, GeneralV1, where I have copied the shared assembly from the version you have seen earlier. Both the client and the intermediary server references the assembly from this directory instead of project references or directly referencing from the General s bin directory. For the second version, I have created another subdirectory, GeneralV2, where I have put the second version of the assembly. The intermediary server still references the version from the directory GeneralV1, whereas the client will know to reference the version from the directory GeneralV2.
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The new version of the shared assembly, version 2.0.0.2, adds those two properties to the Person class as you can see in the following code snippet. Don t forget to change the version number in the assembly.
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CHAPTER 8 THE INS AND OUTS OF VERSIONING
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[Serializable] public class Person : ISerializable { public int Age; public string Firstname; public string Lastname; public DateTime Birthdate; public string Comments; public Person(string first, string last, int age) { this.Age = age; this.Firstname = first; this.Lastname = last; } public Person(SerializationInfo info, StreamingContext context) { Age = info.GetInt32("Age"); Firstname = info.GetString("Firstname"); Lastname = info.GetString("Lastname"); try { Birthdate = info.GetDateTime("Birthdate"); Comments = info.GetString("Comments"); } catch { } } public void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("Age", Age); info.AddValue("Firstname", Firstname); info.AddValue("Lastname", Lastname); info.AddValue("Birthdate", Birthdate); info.AddValue("Comments", Comments); } } The implementation of the Person object exactly follows the strategy you ve already seen in the section Versioning of [Serializable] Objects earlier in this chapter. On serialization, it just adds the new information, whereas on deserialization it tries to retrieve the new information, but if it fails it just leaves it empty. Of course, the client and the back-end server must be modified to initialize these properties. For example, the server s GetPerson() and UploadPerson() methods could be modified as follows:
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CHAPTER 8 THE INS AND OUTS OF VERSIONING
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public Person GetPerson() { Console.WriteLine(">> GetPerson()"); Console.WriteLine(">> Returning person {0}...", _ageCount); Person p = new Person("Test", "App", _ageCount++); p.Birthdate = DateTime.Now; p.Comments = "Try to find this info on the client!"; return p; } public void UploadPerson(Person p) { Console.WriteLine(">> UploadPerson()"); Console.WriteLine(">> Person {0} {1} {2}", p.Firstname, p.Lastname, p.Age); Console.WriteLine(">>>> Additional properties {0} {1}", p.Birthdate, p.Comments); _ageCount += p.Age; } Of course, the original client s code must read or initialize the properties, too. Therefore, the code of the client could be modified as demonstrated in the following code snippet: Console.WriteLine("Calling GetPerson()..."); Person p = factory.GetPerson(); Console.WriteLine(">> Person retrieved: {0} {1}, {2}", p.Firstname, p.Lastname, p.Age.ToString()); Console.WriteLine(">>>> Additional properties: {0} {1}", p.Birthdate, p.Comments); Console.WriteLine("Calling UploadPerson()..."); Person up = new Person("Upload", "Test", 20); up.Birthdate = DateTime.Now.AddDays(2); up.Comments = "Person. Two days older."; factory.UploadPerson(up); Console.WriteLine(">> Upload called successfully!"); If you now let the client talk directly to the back-end server by configuring the wellknown entry in the configuration of the client with the port and URL for the back-end server (<wellknown type="General.IRemoteFactory, General" url="tcp://localhost:1234/ MyServer.rem" />) and test your solutions, you will see that the new properties are accepted as shown in Figures 8-21 and 8-22.
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CHAPTER 8 THE INS AND OUTS OF VERSIONING
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Figure 8-21. The client with the new version of Person directly talking to the server
Figure 8-22. The server with the new version of Person called directly from the client
Now you ll change the client to use the intermediary server by again changing the well-known client configuration in its configuration file to call to port 1235 and to the server MyIntermed.rem as in the original situation. If you take a look at the running applications now, you ll recognize that any additional data is lost when sent through the intermediary. The reason for this should be obvious: the intermediary still works with version 1 of your Person class and therefore ignores the additional information on the deserialization process. And, of course, when it serializes the Person object for sending to the back-end server, it just serializes the data known from version 1. Therefore, the output of the three applications looks like what you see in Figures 8-23, 8-24, and 8-25.
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