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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.reflection.assembly.load below:

Assembly.Load Method (System.Reflection) | Microsoft Learn

Source:: Assembly.CoreCLR.cs

Source:: Assembly.CoreCLR.cs

Source:: Assembly.CoreCLR.cs

Source:: Assembly.CoreCLR.cs

Loads an assembly with the specified name.

public:
 static System::Reflection::Assembly ^ Load(System::String ^ assemblyString);

public static System.Reflection.Assembly Load(string assemblyString);

static member Load : string -> System.Reflection.Assembly

Public Shared Function Load (assemblyString As String) As Assembly

Parameters

assemblyString: String

The long or short form of the assembly name.

Returns

The loaded assembly.

Exceptions

assemblyString is a zero-length string.

assemblyString is not found.

A file that was found could not be loaded.

assemblyString is not a valid assembly for the currently loaded runtime.

Examples

The following example loads an assembly given its fully qualified name, and lists all the types contained in the specified assembly. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using System;
using System.Reflection;

class Class1
{
    public static void Main()
    {
        // You must supply a valid fully qualified assembly name.
        Assembly SampleAssembly = Assembly.Load
            ("SampleAssembly, Version=1.0.2004.0, Culture=neutral, PublicKeyToken=8744b20f8da049e3");
        // Display all the types contained in the specified assembly.
        foreach (Type oType in SampleAssembly.GetTypes()) {
            Console.WriteLine(oType.Name);
        }
    }
}

Imports System.Reflection

Class Class1
    Public Shared Sub Main()
        ' You must supply a valid fully qualified assembly name.
        Dim SampleAssembly As [Assembly] = _
            [Assembly].Load("SampleAssembly, Version=1.0.2004.0, Culture=neutral, PublicKeyToken=8744b20f8da049e3")
        Dim oType As Type
        ' Display all the types contained in the specified assembly.
        For Each oType In SampleAssembly.GetTypes()
            Console.WriteLine(oType.Name)
        Next oType
    End Sub	'LoadSample
End Class

Remarks

In .NET Core/.NET 5+, the target assembly will be loaded into the current AssemblyLoadContext or into the AssemblyLoadContext.CurrentContextualReflectionContext context if it's set. For more information on assembly loading, see Managed assembly loading algorithm.

To load the correct assembly, it's recommended to call the Load method by passing the long form of the assembly name. The long form of an assembly name consists of its simple name (such as "System" for the System.dll assembly) along with its version, culture, public key token, and optionally its processor architecture. It corresponds to the assembly's FullName property. The following example illustrates the use of a long name to load the System.dll assembly for .NET Framework 4:

using System;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      string longName = "system, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
      Assembly assem = Assembly.Load(longName);
      if (assem == null)
         Console.WriteLine("Unable to load assembly...");
      else
         Console.WriteLine(assem.FullName);
   }
}
// The example displays the following output:
//        system, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Imports System.Reflection

Module Example
   Public Sub Main()
      Dim longName As String = "system, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
      Dim assem As Assembly = Assembly.Load(longName)
      If assem Is Nothing Then
         Console.WriteLine("Unable to load assembly...")
      Else
         Console.WriteLine(assem.FullName)
      End If
   End Sub
End Module
' The example displays the following output:
'       system, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

FileLoadException is thrown if assemblyString specifies the full assembly name, and the first assembly that matches the simple name has a different version, culture, or public key token. The loader does not continue probing for other assemblies that match the simple name.

In the .NET Framework version 2.0, processor architecture is added to assembly identity, and can be specified as part of assembly name strings. For example, "ProcessorArchitecture=msil". However, the recommended way to specify an assembly name is to create an AssemblyName object and pass it to an appropriate overload of the Load method. See AssemblyName.ProcessorArchitecture.