CompatibleComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / CompatibleComparer.cs / 1 / CompatibleComparer.cs
                        

                        
                            namespace System.Collections { 

    [Serializable()]
    internal class CompatibleComparer: IEqualityComparer {
        IComparer _comparer; 
#pragma warning disable 618
        IHashCodeProvider _hcp; 
 
        internal CompatibleComparer(IComparer comparer, IHashCodeProvider hashCodeProvider) {
            _comparer = comparer; 
            _hcp = hashCodeProvider;
        }
#pragma warning restore 618
 
        public int Compare(Object a, Object b) {
            if (a == b) return 0; 
            if (a == null) return -1; 
            if (b == null) return 1;
            if (_comparer != null) 
                return _comparer.Compare(a,b);
            IComparable ia = a as IComparable;
            if (ia != null)
                return ia.CompareTo(b); 

            throw new ArgumentException(Environment.GetResourceString("Argument_ImplementIComparable")); 
        } 

        public new bool Equals(Object a, Object b) { 
            return Compare(a, b) == 0;
        }

        public int GetHashCode(Object obj) { 
            if( obj == null) {
                throw new ArgumentNullException("obj"); 
            } 

            if (_hcp != null) 
                return _hcp.GetHashCode(obj);
            return obj.GetHashCode();
        }
 
        // These are helpers for the Hashtable to query the IKeyComparer infrastructure.
        internal IComparer Comparer { 
            get { 
                return _comparer;
            } 
        }

        // These are helpers for the Hashtable to query the IKeyComparer infrastructure.
#pragma warning disable 618 
        internal IHashCodeProvider HashCodeProvider {
            get { 
                return _hcp; 
            }
        } 
#pragma warning restore 618
    }
}

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