c# - 为从List <string>继承的集合实现GetEnumerator()

我正在尝试实现FilePathCollection。它的项目将是简单的文件名(无路径-如“image.jpg”)。一旦通过foreach循环使用了集合，它应返回通过与baseDirectory串联创建的完整路径。我怎样才能做到这一点？

public class FilePathCollection : List<string>
{
    string baseDirectory;

    public FilePathCollection(string baseDirectory)
    {
        this.baseDirectory = baseDirectory;
    }

    new public System.Collections.IEnumerator GetEnumerator()
    {
        foreach (string value in this._items) //this does not work because _list is private
            yield return baseDirectory + value;
    }
}

最佳答案

new public IEnumerator GetEnumerator()
{
  using(IEnumerator ie = base.GetEnumerator())
    while (ie.MoveNext()) {
      yield return Path.Combine(baseDirectory, ie.Current);
  }
}