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This article has been
excerpted from book "The Complete Visual C# Programmer's Guide" from the Authors
of C# Corner.
In .NET, each application runs in an application domain under the control of a
host. The host creates the application domain and loads assemblies into it. The
host has access to information about the code via evidence. This information can
include the zone in which the code originates or the digital signatures of the
assemblies in the application domain. The System.AppDomain class provides the
application domain functionality and is used by hosts. A host can be trusted if
it provides the CLR with all the evidence the security policy requires.
There are several types of application hosts:
- Browser host-includes applications hosted
by Microsoft Internet Explorer; runs code within the context of a Web site.
- Server host-regarding ASP.NET, refers to
the host that runs the code that handles requests submitted to a server.
- Shell host-refers to a host that launches
applications, namely .exe files, from the operating system shell.
- Custom-designed host-a host that creates
domains or loads assemblies into domains (e.g., dynamic assemblies).
Listing 22.4 executes the managed application
MyApp.exe, with specific evidence inside the Internet security zone, in which
code has minimal access to local resources.
Listing 22.4: Running an Application with a Specific Evidence and Zone
String[] argsToApp =
null; SecurityZone myZone =
SecurityZone.Internet; Evidence myEvidence = new
Evidence(); myEvidence.AddHost(new Zone(myZone)); myEvidence.AddHost(new Url(myURL)); AppDomain app =
AppDomain.CreateDomain(myApplication,
myEvidence); app.ExecuteAssembly(myApplication, myEvidence, argsToApp);
Conclusion
Hope this article would have helped you in understanding
Application Domains in C#. See other articles on the website on .NET and C#.
|
The Complete Visual
C# Programmer's Guide covers most of the major components that make
up C# and the .net environment. The book is geared toward the
intermediate programmer, but contains enough material to satisfy the
advanced developer. |
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