IsSubsetOf()

bool System.Collections.Generic.HashSet< T >.IsSubsetOf ( IEnumerable< T > other )

inline

Implements System.Collections.Generic.ISet< T >.

Definition at line 541 of file HashSet.cs.

    {
        if (other == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.other);
        }
        if (Count == 0 || other == this)
        {
            return true;
        }
        if (other is HashSet<T> hashSet && EqualityComparersAreEqual(this, hashSet))
        {
            if (Count > hashSet.Count)
            {
                return false;
            }
            return IsSubsetOfHashSetWithSameComparer(hashSet);
        }
        var (num, num2) = CheckUniqueAndUnfoundElements(other, returnIfUnfound: false);
        if (num == Count)
        {
            return num2 >= 0;
        }
        return false;
    }

References System.Collections.Generic.HashSet< T >.CheckUniqueAndUnfoundElements(), System.Collections.Generic.Dictionary< TKey, TValue >.Count, System.Collections.Generic.HashSet< T >.Count, System.Runtime.Serialization.Dictionary, System.Collections.Generic.HashSet< T >.EqualityComparersAreEqual(), System.Collections.Generic.HashSet< T >.IsSubsetOfHashSetWithSameComparer(), System.other, and System.ThrowHelper.ThrowArgumentNullException().