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Concept of App Domain in .Net



Creating Application Domains:

Application domain is just like process, provides separate memory space, and isolates from other code. But it’s quite light weight. It also provides the following advantages:

1-      Reliability:
If a domain crashes, it can be unloaded. Hence doesn’t affect the other assemblies.
2-      Efficiency:
Loading all assemblies in one domain can be cumbersome and can make the process heavy but Appdomains are efficient in this manner.

Important properties of AppDomain:

ApplicationIdentity, ApplicationTrust, BaseDirectory, CurrentDomain, DomainManager, DomainDirectory, Evidence, FriendlyName, ID, RelativeSearchPath, SetupInformation, ShadowCopyFiles.

Important methods of AppDomain:

ApplyPolicy, CreateCOMInstanceFrom, CreateDomain, CreateInstance (Assembly).

To create an AppDomain:
AppDomain adomain = AppDomain.CreateDomain(“D”);

To execute an assembly:

                adomain.ExecuteAssembly(“assembly.exe”);
OR           adomain.ExecuteAssemblyByName(“Assembly”);

To unload an domain:

                AppDomain.Unload(d);

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