c＃字典可以找到类型的hashset＆lt; enum＆gt;

Question

private Dictionary<HashSet<Flags>, int> dict;

使用Unity Inspector迭代该词典在开始时填充了字典，

public enum Flags
{
    flag1,
    flag2,
    flag3
}

该字典确认它包含用于访问的相同的标签，但尝试使用密钥访问始终返回KeynotFoundException。用containsKey手动测试也返回false。

Answer 1

好吧，默认情况下，.net通过参考比较类，例如，

// A and B has same values, but different references
var A = new HashSet<Flags>() { Flags.flag1 };
var B = new HashSet<Flags>() { Flags.flag1 };

// Not Equals, since A and B doesn't share the same reference:
if (A.Equals(B)) 
  Console.Write("Equals");
else
  Console.Write("Not Equals");

如果要通过 value 进行比较，则应实现iequalityComparer＆lt; t＆gt;接口：

    public class HashSetComparer<T> : IEqualityComparer<HashSet<T>> {
      public bool Equals(HashSet<T> left, HashSet<T> right) {
        if (ReferenceEquals(left, right))
          return true;
        if (left == null || right == null)
          return false;

        return left.SetEquals(right);
      }

      public int GetHashCode(HashSet<T> item) {
        return item == null ? -1 : item.Count;
      }
    }

并使用它：并使用：

private Dictionary<HashSet<Flags>, int> dict = 
  Dictionary<HashSet<Flags>, int>(new HashSetComparer<Flags>());