File size: 3,000 Bytes
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// Licensed under the MIT License.
using System;
using System.Collections.Generic;
using System.IO;
using System.Management.Automation;
using System.Reflection;
using System.Runtime.Loader;
namespace Test.Isolated.Init
{
internal sealed class CustomLoadContext : AssemblyLoadContext
{
private readonly string _dependencyDirPath;
public CustomLoadContext(string dependencyDirPath)
: base("MyCustomALC", isCollectible: false)
{
_dependencyDirPath = dependencyDirPath;
}
protected override Assembly Load(AssemblyName assemblyName)
{
// We do the simple logic here of looking for an assembly of the given name
// in the configured dependency directory.
string assemblyPath = Path.Combine(_dependencyDirPath, $"{assemblyName.Name}.dll");
if (File.Exists(assemblyPath))
{
// The ALC must use inherited methods to load assemblies.
// Assembly.Load*() won't work here.
return LoadFromAssemblyPath(assemblyPath);
}
// For other assemblies, return null to allow other resolutions to continue.
return null;
}
}
public class Init : IModuleAssemblyInitializer, IModuleAssemblyCleanup
{
private static readonly CustomLoadContext s_context;
private static readonly HashSet<string> s_moduleAssemblies;
static Init()
{
string dependencyDirPath = Path.Combine(Path.GetDirectoryName(typeof(Init).Assembly.Location), "Dependencies");
s_context = new CustomLoadContext(dependencyDirPath);
s_moduleAssemblies = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
"Test.Isolated.Nested",
"Test.Isolated.Root"
};
}
public void OnImport()
{
// Add the Resolving event handler here.
AssemblyLoadContext.Default.Resolving += ResolveAlcEngine;
}
public void OnRemove(PSModuleInfo psModuleInfo)
{
// Remove the Resolving event handler here.
AssemblyLoadContext.Default.Resolving -= ResolveAlcEngine;
}
private static Assembly ResolveAlcEngine(AssemblyLoadContext defaultAlc, AssemblyName assemblyToResolve)
{
// We only want to resolve our module assemblies here.
if (s_moduleAssemblies.Contains(assemblyToResolve.Name))
{
// This is where the nested module 'Test.Isolated.Nested.dll' and the root module 'Test.Isolated.Root.dll'
// gets loaded into our custom ALC and then passed through into PowerShell's ALC.
return s_context.LoadFromAssemblyName(assemblyToResolve);
}
// Let the resolution chain continue for other assemblies.
return null;
}
}
}
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