// See https://aka.ms/new-console-template for more information

​

using System;

using System.Linq;

using System.IO.Compression;

using System.IO;

using System.Threading;

using System.Threading.Tasks;

using ICSharpCode.Decompiler.Metadata;

using ICSharpCode.Decompiler.TypeSystem;

using NuGet.Common;

using NuGet.Protocol;

using NuGet.Protocol.Core.Types;

using NuGet.Versioning;

using NuGetRepository = NuGet.Protocol.Core.Types.Repository;

​

const string dllName = "Avalonia.Base.dll";

​

var peFile = await GetPEFileAsync();

var resolver = new UniversalAssemblyResolver(dllName, throwOnError: false, targetFramework: "netcoreapp2.0");

var typeSystem = new DecompilerTypeSystem(peFile, resolver);

var typeDef = typeSystem.MainModule.GetTypeDefinition(new TopLevelTypeName("Avalonia.Input.Raw.RawPointerPoint"));

var constructors = typeDef.GetConstructors().ToArray();

​

// Why are there "two" constructors with identical reflection names?

foreach (var constructor in constructors)

{

    var info = new

    {

        Type = constructor.GetType().FullName,

        constructor.ReflectionName,

        ParameterCount = constructor.Parameters.Count

    };

    Console.WriteLine(info);

}

​

​

static async Task<PEFile> GetPEFileAsync()

{

    var repo = NuGetRepository.Factory.GetCoreV3("https://api.nuget.org/v3/index.json");

    var resource = await repo.GetResourceAsync<FindPackageByIdResource>().ConfigureAwait(false);

    using var packageStream = new MemoryStream();

    await resource.CopyNupkgToStreamAsync(

            "avalonia",

            new NuGetVersion(11, 0, 0, "preview5"),

            packageStream,

            NullSourceCacheContext.Instance,

            NullLogger.Instance,

            CancellationToken.None)

        .ConfigureAwait(false);

    using var archive = new ZipArchive(packageStream, ZipArchiveMode.Read);

    var dllEntry = archive.GetEntry($"lib/netcoreapp2.0/{dllName}");

    var compressedStream = dllEntry!.Open();

    using var decompressedStream = new MemoryStream();

    await compressedStream.CopyToAsync(decompressedStream);

    await compressedStream.FlushAsync();

    decompressedStream.Position = 0;

​

    var peFile = new PEFile(dllName, decompressedStream);

    return peFile;

}