アセンブリから他アセンブリに転送された型情報を取得する (C#; .NET Standard 2.1/.NET Core 2.1)

アセンブリに定義されている型のうち、別のアセンブリに転送された(forwarded)型を取得するには、Assembly.GetForwardedTypesメソッドを使うことができます。　このメソッドは、.NET Standard 2.1/.NET Core 2.1以降で使用できます。

このメソッドでは、属性TypeForwardedToAttribute/TypeForwardedFromAttributeによって転送された型が取得されます。　より具体的には、過去のバージョンではこのアセンブリで定義・実装されていたが、現在では他のアセンブリに実装が移された型が取得されます。

アセンブリから他アセンブリに転送された型情報を取得する .NET Standard 2.1/.NET Core 2.1

行番号を表示する

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

class Sample {
  static void Main()
  {
    // System.Collections.dll(.NET Standard 1.6)をロードする
    var name = new AssemblyName("System.Collections, Version=4.0.10.0, PublicKeyToken=b03f5f7f11d50a3a");
    var assm = Assembly.Load(name);

    Console.WriteLine($"{name.FullName} -> {assm.GetName().FullName}");
    Console.WriteLine();

    // アセンブリで公開される型・他アセンブリへ転送される型の一覧と、転送先のアセンブリを表示する
    var forwardedTypes = new HashSet<Type>(assm.GetForwardedTypes());
    var exportedTypes = new HashSet<Type>(assm.GetExportedTypes());

    foreach (var t in exportedTypes.Union(forwardedTypes)) {
      Console.Write($"{t,-100}");
      Console.Write(forwardedTypes.Contains(t) ? "-> " : " @ ");
      Console.WriteLine(t.Assembly.GetName().FullName);
    }
  }
}

実行結果

System.Collections, Version=4.0.10.0, PublicKeyToken=b03f5f7f11d50a3a -> System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

System.Collections.BitArray                                                                          @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.StructuralComparisons                                                             @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.CollectionExtensions                                                      @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.LinkedList`1[T]                                                           @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.LinkedList`1+Enumerator[T]                                                @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.LinkedListNode`1[T]                                                       @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.Queue`1[T]                                                                @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.Queue`1+Enumerator[T]                                                     @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2[TKey,TValue]                                           @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+Enumerator[TKey,TValue]                                @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+KeyCollection[TKey,TValue]                             @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+KeyCollection+Enumerator[TKey,TValue]                  @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+ValueCollection[TKey,TValue]                           @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+ValueCollection+Enumerator[TKey,TValue]                @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedDictionary`2+KeyValuePairComparer[TKey,TValue]                      @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.TreeSet`1[T]                                                              @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedList`2[TKey,TValue]                                                 @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedList`2+KeyList[TKey,TValue]                                         @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedList`2+ValueList[TKey,TValue]                                       @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedSet`1[T]                                                            @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.SortedSet`1+Enumerator[T]                                                 @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.Stack`1[T]                                                                @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.Stack`1+Enumerator[T]                                                     @ System.Collections, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Generic.Comparer`1[T]                                                            -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2[TKey,TValue]                                                -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2+Enumerator[TKey,TValue]                                     -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2+KeyCollection[TKey,TValue]                                  -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2+KeyCollection+Enumerator[TKey,TValue]                       -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2+ValueCollection[TKey,TValue]                                -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.Dictionary`2+ValueCollection+Enumerator[TKey,TValue]                     -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.EqualityComparer`1[T]                                                    -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.HashSet`1[T]                                                             -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.HashSet`1+Enumerator[T]                                                  -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.List`1[T]                                                                -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.List`1+Enumerator[T]                                                     -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
System.Collections.Generic.ReferenceEqualityComparer                                                -> System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e