我有以下課程public class MyObject{ public int Id1 {get;set;} public int Id2 {get;set;} public int Id3 {get;set;} public MyObject(int id1, int id2, int id3) { this.Id1 = id1; this.Id2 = id2; this.Id3 = id3; }}我想在字典中創(chuàng)建一個(gè)對(duì)象列表。我是不是最好這樣做Dictionary<MyObject, MyObject> dictionary = new Dictionary<MyObject,MyObject>();MyObject object1 = new MyObject(1,2,3);MyObject object2 = new MyObject(2,2,3);MyObject object3 = new MyObject(2,2,3);if(!dictionary.ContainsKey(object1)) dictionary.Add(object1,object1);if(!dictionary.ContainsKey(object2)) dictionary.Add(object2,object2);if(!dictionary.ContainsKey(object3)) dictionary.Add(object3,object3);或者我應(yīng)該創(chuàng)建一個(gè)字典，其鍵是一個(gè)字符串，并包含連接的字符串。例如Dictionary<string, MyObject> dictionary2 = new Dictionary<string,MyObject>();string key = object1.Id1 + "|" + object1.Id2 + "|" + object1.Id3;if(!dictionary2.ContainsKey(key )) dictionary2.Add(key ,object1);
2 回答
撒科打諢
TA貢獻(xiàn)1934條經(jīng)驗(yàn) 獲得超2個(gè)贊
看起來(lái)你想要的是一個(gè) Hashset，因?yàn)殒I和值是相同的，你不想要重復(fù)。
您將需要這個(gè)類來(lái)說(shuō)明哪些對(duì)象是相等的。
class MyObjectEqualityComparer : IEqualityComparer<MyObject>
{
MyObjectEqualityComparer()
{
}
public static readonly MyObjectEqualityComparer Default = new MyObjectEqualityComparer();
public bool Equals(MyObject x, MyObject y)
{
return x.Id1 == y.Id1 && x.Id2 == y.Id2 && x.Id3 == y.Id3;
}
public int GetHashCode(MyObject obj)
{
return obj.Id1.GetHashCode() ^ obj.Id2.GetHashCode() ^ obj.Id3.GetHashCode();
}
}
然后做一個(gè)哈希集
HashSet<MyObject> set = new HashSet<MyObject>(MyObjectEqualityComparer.Default);
MyObject object1 = new MyObject(1,2,3);
MyObject object2 = new MyObject(2,2,3);
MyObject object3 = new MyObject(2,2,3);
if(set.Add(object1))
{
// item was added.
}
else
{
// item already exist.
}
梵蒂岡之花
TA貢獻(xiàn)1900條經(jīng)驗(yàn) 獲得超5個(gè)贊
覆蓋
Equals+GetHashCodeinMyObject或將自定義傳遞
IEqualityComparer<MyObject>給字典構(gòu)造函數(shù)
但是將這個(gè)對(duì)象存儲(chǔ)為鍵和值是沒(méi)有意義的。也許你想用 aHashSet<MyObject>代替。
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