C# と VB.NET の質問掲示板

以下のような感じでどうでしょうか。
※ 文字列にしか対応させてません

List<MyClass> list = getList();
dataGridView1.DataSource = new MyClassSortList<MyClass>(list);
.........

class MyClassComparer<T> : IComparer<T> {
  private ListSortDirection direction;
  private PropertyDescriptor prop;

  public MyClassComparer(PropertyDescriptor prop, ListSortDirection direction) {
    this.prop = prop;
    this.direction = direction;
  }

  public int Compare(T x, T y) {
    object objX = x.GetType().GetProperty(prop.Name).GetValue(x, null);
    object objY = y.GetType().GetProperty(prop.Name).GetValue(y, null);

    int ret = objX.ToString().CompareTo(objY.ToString()); // とりあえず文字列のみ。。。
    if ((direction == ListSortDirection.Descending)) {
      ret *= -1;
    }

    return ret;
  }
}

class MyClassSortList<T> : BindingList<T> {
  public MyClassSortList(List<T> list) {
    ((List<T>)Items).AddRange(list);
  }

  protected override bool SupportsSortingCore {
    get { return true; }
  }

  protected override void ApplySortCore(PropertyDescriptor propDescriptor
      , ListSortDirection listDirection) {
    List<T> list = (List<T>)base.Items;

    if (list != null) {
      MyClassComparer<T> comparer = new MyClassComparer<T>(propDescriptor, listDirection);
      list.Sort(comparer);
    }

    OnListChanged(new ListChangedEventArgs(ListChangedType.ItemMoved, propDescriptor));
  }
}