How to Unload Assemblies Loaded with Assembly.LoadFrom() in C#?

Unloading Assemblies Loaded with Assembly.LoadFrom()

In C#, assemblies loaded using Assembly.LoadFrom() need to be explicitly unloaded to free up memory and release resources held by the assembly.

Unloading the Assembly

To unload an assembly, you can use the AppDomain.Unload method. This method unloads the specified AppDomain, which in turn unloads all the assemblies loaded within that AppDomain. For example:

// Create a new AppDomain and load the assembly
AppDomain dom = AppDomain.CreateDomain("some");
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);

Explicitly Calling the Garbage Collector

Calling assem = null alone does not guarantee that the assembly will be unloaded immediately. The garbage collector will still need to run to reclaim the unreferenced resources. You cannot explicitly call the garbage collector in C#.

However, you can force the garbage collector to run sooner by calling the GC.Collect method. This method triggers a garbage collection cycle and attempts to reclaim all unreachable objects. While GC.Collect can be used to improve performance in some scenarios, it's generally not recommended to rely on it heavily, as it can introduce pauses in your application.

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