AppDomain.AssemblyLoad Event

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

AppDomain.cs

Occurs when an assembly is loaded.

public:
 event AssemblyLoadEventHandler ^ AssemblyLoad;

public event AssemblyLoadEventHandler? AssemblyLoad;

member this.AssemblyLoad : AssemblyLoadEventHandler 

Public Custom Event AssemblyLoad As AssemblyLoadEventHandler 

Event Type

AssemblyLoadEventHandler

Examples

The following sample demonstrates the AssemblyLoad event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
ref class Test
{
public:
   static void MyAssemblyLoadEventHandler( Object^ sender, AssemblyLoadEventArgs^ args )
   {
      Console::WriteLine( "ASSEMBLY LOADED: {0}", args->LoadedAssembly->FullName );
      Console::WriteLine();
   }

};

void PrintLoadedAssemblies( AppDomain^ domain )
{
   Console::WriteLine( "LOADED ASSEMBLIES:" );
   System::Collections::IEnumerator^ myEnum = domain->GetAssemblies()->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Assembly^ a = safe_cast<Assembly^>(myEnum->Current);
      Console::WriteLine( a->FullName );
   }

   Console::WriteLine();
}

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   currentDomain->AssemblyLoad += gcnew AssemblyLoadEventHandler( Test::MyAssemblyLoadEventHandler );
   PrintLoadedAssemblies( currentDomain );
   
   // Lists mscorlib and this assembly
   // You must supply a valid fully qualified assembly name here.
   currentDomain->CreateInstance( "System.Windows.Forms, Version, Culture, PublicKeyToken", "System.Windows.Forms.TextBox" );
   
   // Loads System, System::Drawing, System::Windows::Forms
   PrintLoadedAssemblies( currentDomain );
   
   // Lists all five assemblies
}

using System;
using System.Reflection;

class AssemblyLoadSnippet {

   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;
      currentDomain.AssemblyLoad += new AssemblyLoadEventHandler(MyAssemblyLoadEventHandler);

      PrintLoadedAssemblies(currentDomain);
      // Lists mscorlib and this assembly

      // You must supply a valid fully qualified assembly name here.
      currentDomain.CreateInstance("System.Windows.Forms, Version, Culture, PublicKeyToken", "System.Windows.Forms.TextBox");
      // Loads System, System.Drawing, System.Windows.Forms

      PrintLoadedAssemblies(currentDomain);
      // Lists all five assemblies
   }

   static void PrintLoadedAssemblies(AppDomain domain) {
      Console.WriteLine("LOADED ASSEMBLIES:");
      foreach (Assembly a in domain.GetAssemblies()) {
         Console.WriteLine(a.FullName);
      }
      Console.WriteLine();
   }

   static void MyAssemblyLoadEventHandler(object sender, AssemblyLoadEventArgs args) {
      Console.WriteLine("ASSEMBLY LOADED: " + args.LoadedAssembly.FullName);
      Console.WriteLine();
   }
}

open System

let printLoadedAssemblies (domain: AppDomain) =
    printfn "LOADED ASSEMBLIES:"
    for a in domain.GetAssemblies() do
        printfn $"{a.FullName}"
    printfn ""

let myAssemblyLoadEventHandler _ (args: AssemblyLoadEventArgs)  =
    printfn $"ASSEMBLY LOADED: {args.LoadedAssembly.FullName}\n"

let currentDomain = AppDomain.CurrentDomain
currentDomain.AssemblyLoad.AddHandler(AssemblyLoadEventHandler myAssemblyLoadEventHandler)

printLoadedAssemblies currentDomain
// Lists mscorlib and this assembly

// You must supply a valid fully qualified assembly name here.
currentDomain.CreateInstance("System.Windows.Forms, Version, Culture, PublicKeyToken", "System.Windows.Forms.TextBox")
// Loads System, System.Drawing, System.Windows.Forms

printLoadedAssemblies currentDomain
// Lists all five assemblies

Option Strict On
Option Explicit On

Imports System.Reflection

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      AddHandler currentDomain.AssemblyLoad, AddressOf MyAssemblyLoadEventHandler
      
      PrintLoadedAssemblies(currentDomain)
      ' Lists mscorlib and this assembly

      ' You must supply a valid fully qualified assembly name here.      
      currentDomain.CreateInstance("System.Windows.Forms,Version,Culture,PublicKeyToken", "System.Windows.Forms.TextBox")
      ' Loads System, System.Drawing, System.Windows.Forms
      
      PrintLoadedAssemblies(currentDomain)
      ' Lists all five assemblies
   End Sub
   
   Sub PrintLoadedAssemblies(domain As AppDomain)
      Console.WriteLine("LOADED ASSEMBLIES:")
      Dim a As System.Reflection.Assembly
      For Each a In domain.GetAssemblies()
         Console.WriteLine(a.FullName)
      Next a
      Console.WriteLine()
   End Sub
   
   Sub MyAssemblyLoadEventHandler(sender As Object, args As AssemblyLoadEventArgs)
      Console.WriteLine("ASSEMBLY LOADED: " + args.LoadedAssembly.FullName)
      Console.WriteLine()
   End Sub

End Module 'Test

Remarks

The AssemblyLoadEventHandler delegate for this event indicates what assembly was loaded.

To register an event handler for this event, you must have the required permissions, or a SecurityException is thrown.

For more information about handling events, see Handling and Raising Events.