.NET Core 3.0 可回收程序集加载上下文的实现

dotnet new globaljson --sdk-version 3.0.100-preview-009812

public class CollectibleAssemblyLoadContext : AssemblyLoadContext
{
  public CollectibleAssemblyLoadContext() : base(isCollectible: true)
  { }
 
  protected override Assembly Load(AssemblyName assemblyName)
  {
    return null;
  }
}

using System;
 
namespace SampleLibrary
{
  public class SayHello
  {
    public void Hello(int iteration)
    {
      Console.WriteLine($"Hello {iteration}!");
    }
  }
}

var context = new CollectibleAssemblyLoadContext();
var assemblyPath = Path.Combine(Directory.GetCurrentDirectory(),"SampleLibrary.dll");
using (var fs = new FileStream(assemblyPath, FileMode.Open, FileAccess.Read))
{
  var assembly = context.LoadFromStream(fs);

  var type = assembly.GetType("SampleLibrary.SayHello");
  var greetMethod = type.GetMethod("Hello");

  var instance = Activator.CreateInstance(type);
  greetMethod.Invoke(instance, new object[] { i });
}

context.Unload();

GC.Collect();
GC.WaitForPendingFinalizers();