如何使Distinct()
方法使用自定义对象列表(在本例中为Href
),这是当前对象的样子:
public class Href : IComparable, IComparer<Href>
{
public Uri URL { get; set; }
public UrlType URLType { get; set; }
public Href(Uri url, UrlType urltype)
{
URL = url;
URLType = urltype;
}
#region IComparable Members
public int CompareTo(object obj)
{
if (obj is Href)
{
return URL.ToString().CompareTo((obj as Href).URL.ToString());
}
else
throw new ArgumentException("Wrong data type.");
}
#endregion
#region IComparer<Href> Members
int IComparer<Href>.Compare(Href x, Href y)
{
return string.Compare(x.URL.ToString(), y.URL.ToString());
}
#endregion
}
答案 0 :(得分:16)
您需要覆盖Equals
和GetHashCode
。
GetHashCode
应为所有被认为相等的实例返回相同的值。
例如:
public override bool Equals(object obj) {
Href other = obj as Href;
return other != null && URL.Equals(other.URL);
}
public override int GetHashCode() {
return URL.GetHashCode();
}
由于.Net的Uri类重写了GetHashCode,因此您只需返回URL的哈希码。
答案 1 :(得分:0)
你可以获取aku's comparer的副本(但要注意GetHashCode
实现),然后写下这样的内容
hrefList.Distinct(new Comparer<Href>((h1,h2)=>h1.URL==h2.URL))