How Can I Safely Load, Instantiate, and Run a Method from a Dynamically Loaded .NET Assembly?

The Secure and Efficient Way to Load, Instantiate, and Execute Methods from Dynamic .NET Assemblies

Dynamically loading a .NET assembly, finding a specific class, and executing its methods can be complex. This guide provides a robust solution to this challenge.

The Challenge:

Developers often face the problem of dynamically building, loading, and instantiating a class from a .NET assembly to run a specific method (e.g., Run()). Direct casting or using reflection can lead to issues with inter-assembly type resolution and security.

The Solution: Leveraging AppDomains

The most effective approach involves using AppDomain. This offers crucial advantages:

Benefits of Using AppDomains:

• Improved Security: The dynamically loaded assembly operates within a contained environment, limiting its access to system resources and preventing potential security breaches.
• Enhanced Control: AppDomains allow for customized security policies, providing granular control over the loaded assembly's behavior.

Here's a refined solution:

var domain = AppDomain.CreateDomain("NewDomainName");
var t = typeof(TypeIWantToLoad);
var runnable = domain.CreateInstanceFromAndUnwrap(@"C:\myDll.dll", t.Name) as IRunnable;
if (runnable == null) throw new Exception("Assembly loading failed.");
runnable.Run();

Unloading Assemblies and Advanced Options:

The AppDomain approach simplifies assembly unloading. For even more sophisticated dynamic assembly management, consider the Managed Add-ins Framework (System.AddIn namespace). Microsoft's documentation on Add-ins and Extensibility offers detailed guidance on its advanced features.

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