CompatibleComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / CompatibleComparer.cs / 1305376 / CompatibleComparer.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
using System.Diagnostics.Contracts;
 
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"); 
            }
            Contract.EndContractBlock(); 

            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
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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