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Event

Meaning in Life

AssemblyLoad

Occurs when an assembly is loaded

AssemblyResolve

Occurs when the resolution of an assembly fails

DomainUnload

Occurs when an AppDomain is about to be unloaded

ProcessExit

Occurs on the default application domain when the default application

domain’s parent process exits

ResourceResolve

Occurs when the resolution of a resource fails

TypeResolve

Occurs when the resolution of a type fails

UnhandledException

Occurs when an exception is not caught by an event handler

Enumerating a Process’s AppDomains

To illustrate how to interact with .NET application domains programmatically, assume you have a

new C# Console Application named AppDomainManipulator that defines a static method named

PrintAllAssembliesInAppDomain() within the Program type. This helper method makes use of

AppDomain.GetAssemblies() to obtain a list of all .NET binaries hosted within the application

domain in question.

This list is represented by an array of System.Reflection.Assembly types, and thus you are

required to use the System.Reflection namespace (see Chapter 16). Once you acquire the assembly

array, you iterate over the array and print out the friendly name and version of each assembly:

static void PrintAllAssembliesInAppDomain(AppDomain ad)

{

Assembly[] loadedAssemblies = ad.GetAssemblies();

Console.WriteLine("***** Here are the assemblies loaded in {0} *****\n",

ad.FriendlyName);

foreach(Assembly a in loadedAssemblies)

{

Console.WriteLine("-> Name: {0}", a.GetName().Name);

Console.WriteLine("-> Version: {0}\n", a.GetName().Version);

}

}

Now let’s update the Main() method to obtain a reference to the current application domain

before invoking PrintAllAssembliesInAppDomain(), using the AppDomain.CurrentDomain property.

To make things a bit more interesting, notice that the Main() method launches a Windows

Forms message box to force the CLR to load the System.Windows.Forms.dll, System.Drawing.dll,

and System.dll assemblies (so be sure to set a reference to these assemblies and update your using

statements appropriately):

static void Main(string[] args)

{

Console.WriteLine("***** Fun with AppDomains *****\n");