Array.Sort(), List.Sort() + Icomparable実装

#using <mscorlib.dll>

enum class SortCategory {
 Number, Name
};

ref class test : System::IComparable
//ref class test : System::IComparable <test^>    //型を指定するとき
{
public:
 static SortCategory SortCat;            //ソートを行う
 static bool SortReverse;                //ソートの方向
 int value;
 System::String^ str;

 test(int n, System::String^ s) {        //コンストラクタ
  value = n;
  str = s;
 }

 virtual int CompareTo(Object^ obj) {    //Icomparable の実装

 //virtual int CompareTo(test^ obj) {    //型を指定したとき
 //型を指定した場合は safe_cast 無しで obj を test^ として使えます
 //クラスの宣言で Icomparable <test^> とする必要があります

  if(!SortReverse){        //昇順のとき

   if(SortCat == SortCategory::Name){            //名前でソート
    return this->str->CompareTo(safe_cast<test^>(obj)->str);

   }else if(SortCat == SortCategory::Number){    //番号でソート
    return this->value.CompareTo(safe_cast<test^>(obj)->value);

   }

  }else{                    //降順のとき

   if(SortCat == SortCategory::Name){            //名前でソート
    return safe_cast<test^>(obj)->str->CompareTo(this->str);

   }else if(SortCat == SortCategory::Number){    //番号でソート
    return safe_cast<test^>(obj)->value.CompareTo(this->value);

   }
  }
  throw gcnew System::Exception("エラー");
 }
};

int main(array<System::String^>^ argc)
{
 //参照クラス test の array をつくり適当にデータを与える
 array<test^>^ te = gcnew array<test^>(5);
 te[0] = gcnew test(4, "apple");
 te[1] = gcnew test(2, "pare");
 te[2] = gcnew test(5, "grape");
 te[3] = gcnew test(3, "banana");
 te[4] = gcnew test(1, "pineapple");

 //現在の内容を表示
 System::Console::WriteLine("array");
 for each(test^ t in te)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //番号、昇順
 test::SortReverse = false;
 test::SortCat = SortCategory::Number;

 System::Array::Sort(te);

 for each(test^ t in te)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();
 
 //番号、降順
 test::SortReverse = true;
 test::SortCat = SortCategory::Number;

 System::Array::Sort(te);

 for each(test^ t in te)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //名前、昇順
 test::SortReverse = false;
 test::SortCat = SortCategory::Name;

 System::Array::Sort(te);

 for each(test^ t in te)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //名前、降順
 test::SortReverse = true;
 test::SortCat = SortCategory::Name;

 System::Array::Sort(te);

 for each(test^ t in te)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 
 //参照クラス test の list をつくり適当にデータを与える
 System::Collections::Generic::List<test^>^ li = gcnew System::Collections::Generic::List<test^>();
 li->Add(gcnew test(21, "blue"));
 li->Add(gcnew test(18, "red"));
 li->Add(gcnew test(28, "violet"));
 li->Add(gcnew test(11, "green"));
 li->Add(gcnew test(30, "silver"));

 //現在の内容を表示
 System::Console::WriteLine("list");
 for each(test^ t in li)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //番号、昇順
 test::SortReverse = false;
 test::SortCat = SortCategory::Number;

 li->Sort();

 for each(test^ t in li)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();
 
 //番号、降順
 test::SortReverse = true;
 test::SortCat = SortCategory::Number;

 li->Sort();

 for each(test^ t in li)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //名前、昇順
 test::SortReverse = false;
 test::SortCat = SortCategory::Name;

 li->Sort();

 for each(test^ t in li)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 //名前、降順
 test::SortReverse = true;
 test::SortCat = SortCategory::Name;

 li->Sort();

 for each(test^ t in li)
  System::Console::WriteLine(t->value + ", " + t->str);
 System::Console::WriteLine();

 return 0;
}

/*
表示結果
array
4, apple
2, pare
5, grape
3, banana
1, pineapple

1, pineapple
2, pare
3, banana
4, apple
5, grape

5, grape
4, apple
3, banana
2, pare
1, pineapple

4, apple
3, banana
5, grape
2, pare
1, pineapple

1, pineapple
2, pare
5, grape
3, banana
4, apple

list
21, blue
18, red
28, violet
11, green
30, silver

11, green
18, red
21, blue
28, violet
30, silver

30, silver
28, violet
21, blue
18, red
11, green

21, blue
11, green
18, red
30, silver
28, violet

28, violet
30, silver
18, red
11, green
21, blue
*/