How Can I Efficiently Unload Assemblies Loaded with Assembly.LoadFrom() for Performance Testing?

Unloading Assemblies Loaded with Assembly.LoadFrom() for Comparison Testing

Loading assemblies dynamically using Assembly.LoadFrom() incurs a time cost, and you might want to test this time or compare it when reloading the assembly. To achieve this, you need to unload the assembly after the initial load, which raises questions about how to unload assemblies and how to garbage collect allocated resources.

Unloading Assemblies

Setting assem = null alone is not sufficient to unload an assembly. You can use the AssemblyLoadContext class to manage the assembly and unload it explicitly:

AssemblyLoadContext loadContext = AssemblyLoadContext.GetLoadContext(assem);
loadContext.Unload();

Garbage Collection

The garbage collector will automatically reclaim memory allocated to the assembly and its types once it is unloaded. However, if you want to explicitly trigger garbage collection, you can use the GC.Collect() method.

Alternative Method Using AppDomains

An alternative approach to unloading assemblies is to use AppDomains. Each AppDomain is a separate execution environment that can host assemblies independently. You can create a new AppDomain, load the assembly into it, retrieve the types, and then unload the AppDomain to release the resources:

// Create a new AppDomain
AppDomain dom = AppDomain.CreateDomain("SomeDomain");

// Load the assembly into the new AppDomain
AssemblyName assemblyName = new AssemblyName();
assemblyName.CodeBase = pathToAssembly;
Assembly assembly = dom.Load(assemblyName);

// Get the types from the assembly
Type[] types = assembly.GetTypes();

// Unload the AppDomain
AppDomain.Unload(dom);

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