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Part IV
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AppDomain First-Chance Exception Notifications
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Each AppDomain can have associated with it a series of callback methods that get invoked when the CLR begins looking for catch blocks within an AppDomain . These methods can perform logging, or a host can use this mechanism to monitor exceptions being thrown within an AppDomain . The callbacks cannot handle the exception or swallow it in any way; they are just receiving a notification that the exception has occurred . To register a callback method, just add a delegate to AppDomain s instance FirstChanceException event . Here is how the CLR processes an exception: When the exception is first thrown, the CLR invokes any FirstChanceException callback methods registered with the AppDomain that is throwing the exception . Then, the CLR looks for any catch blocks on the stack that are within the same AppDomain . If a catch block handles the exception, then processing of the exception is complete and execution continues as normal . If the AppDomain has no catch block to handle the exception, then the CLR walks up the stack to the calling AppDomain and throws the same exception object again (after serializing and deserializing it) . At this point, it is as if a brand new exception is being thrown, and the CLR invokes any FirstChanceException callback methods registered with the now current AppDomain . This continues until the top of the thread s stack is reached . At that point, if the exception is not handled by any code, the CLR terminates the whole process .
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So far, I ve talked about hosts and how they load the CLR . I ve also talked about how the hosts tell the CLR to create and unload AppDomains . To make the discussion more concrete, I ll describe some common hosting and AppDomain scenarios . In particular, I ll explain how different application types host the CLR and how they manage AppDomains .
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Console UI applications, NT Service applications, Windows Forms applications, and Windows Presentation Foundation (WPF) applications are all examples of self-hosted applications that have managed EXE files . When Windows initializes a process using a managed EXE file, Windows loads the shim and the shim examines the CLR header information contained in the application s assembly (the EXE file) . The header information indicates the version of the CLR that was used to build and test the application . The shim uses this information to determine which version of the CLR to load into the process . After the CLR loads and initializes, it again examines the assembly s CLR header to determine which method is the application s entry point (Main) . The CLR invokes this method, and the application is now up and running .
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22 CLR Hosting and AppDomains
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As the code runs, it accesses other types . When referencing a type contained in another assembly, the CLR locates the necessary assembly and loads it into the same AppDomain . Any additionally referenced assemblies also load into the same AppDomain . When the application s Main method returns, the Windows process terminates (destroying the default AppDomain and all other AppDomains) . Note By the way, you can call System.Environment s static Exit method if you want to shut
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down the Windows process including all of its AppDomains . Exit is the most graceful way of terminating a process because it first calls the Finalize methods of all of the objects on the managed heap and then releases all of the unmanaged COM objects held by the CLR . Finally, Exit calls the Win32 ExitProcess function .
It s possible for the application to tell the CLR to create additional AppDomains in the process s address space . In fact, this is what my Ch22-1-AppDomains application did .
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