C#去除List中集合的重复项(类型对象和单一类型)

bookList = bookList.Distinct(new DataRowComparer()).ToList(); //去除重复书籍

/// <summary>
/// 自定义书籍比较(去重)
/// </summary>
public class DataRowComparer : IEqualityComparer<BookInfo>
{
public bool Equals(BookInfo b1, BookInfo b2)
{
return (b1.BookId == b2.BookId); //去重
}
public int GetHashCode(BookInfo b)
{
return b.ToString().GetHashCode();
}
}

List<string> list = new List<string>();
list.Add("a");
list.Add("a");
list.Add("b");
list.Add("c");
list.Add("b");
list = list.Distinct().ToList();