LocalValueEnumerator.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / Windows / LocalValueEnumerator.cs / 1 / LocalValueEnumerator.cs
                        

                        
                            using System; 
using System.Collections;
using System.Diagnostics;

#pragma warning disable 1634, 1691  // suppressing PreSharp warnings 

namespace System.Windows 
{ 
    /// 
    ///     Local value enumeration object 
    /// 
    /// 
    ///     Modifying local values (via SetValue or ClearValue) during enumeration
    ///     is unsupported 
    /// 
    public struct LocalValueEnumerator : IEnumerator 
    { 
        /// 
        /// Overrides Object.GetHashCode 
        /// 
        /// An integer that represents the hashcode for this object
        public override int GetHashCode()
        { 
            return base.GetHashCode();
        } 
 
        /// 
        ///     Determine equality 
        /// 
        public override bool Equals(object obj)
        {
            LocalValueEnumerator other = (LocalValueEnumerator) obj; 

            return (_count == other._count && 
                    _index == other._index && 
                    _snapshot == other._snapshot);
        } 

        /// 
        ///     Determine equality
        ///  
        public static bool operator ==(LocalValueEnumerator obj1, LocalValueEnumerator obj2)
        { 
          return obj1.Equals(obj2); 
        }
 
        /// 
        ///     Determine inequality
        /// 
        public static bool operator !=(LocalValueEnumerator obj1, LocalValueEnumerator obj2) 
        {
          return !(obj1 == obj2); 
        } 

        ///  
        ///     Get current entry
        /// 
        public LocalValueEntry Current
        { 
            get
            { 
                if(_index == -1 ) 
                {
                    #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception 
                    throw new InvalidOperationException(SR.Get(SRID.LocalValueEnumerationReset));
                }

                if(_index >= Count ) 
                {
                    #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception 
                    throw new InvalidOperationException(SR.Get(SRID.LocalValueEnumerationOutOfBounds)); 
                }
 
                return _snapshot[_index];
            }
        }
 
        /// 
        ///     Get current entry (object reference based) 
        ///  
        object IEnumerator.Current
        { 
            get { return Current; }
        }

        ///  
        ///     Move to the next item in the enumerator
        ///  
        /// Success of the method 
        public bool MoveNext()
        { 
            _index++;

            return _index < Count;
        } 

        ///  
        ///     Reset enumeration 
        /// 
        public void Reset() 
        {
            _index = -1;
        }
 
        /// 
        ///     Return number of items represented in the collection 
        ///  
        public int Count
        { 
            get { return _count; }
        }

        internal LocalValueEnumerator(LocalValueEntry[] snapshot, int count) 
        {
            _index = -1; 
            _count = count; 
            _snapshot = snapshot;
        } 

        private int                     _index;
        private LocalValueEntry[]       _snapshot;
        private int                     _count; 
    }
 
 
    /// 
    ///     Represents a Property-Value pair for local value enumeration 
    /// 
    public struct LocalValueEntry
    {
        ///  
        /// Overrides Object.GetHashCode
        ///  
        /// An integer that represents the hashcode for this object 
        public override int GetHashCode()
        { 
            return base.GetHashCode();
        }

        ///  
        ///     Determine equality
        ///  
        public override bool Equals(object obj) 
        {
            LocalValueEntry other = (LocalValueEntry) obj; 

            return (_dp == other._dp &&
                    _value == other._value);
        } 

        ///  
        ///     Determine equality 
        /// 
        public static bool operator ==(LocalValueEntry obj1, LocalValueEntry obj2) 
        {
          return obj1.Equals(obj2);
        }
 
        /// 
        ///     Determine inequality 
        ///  
        public static bool operator !=(LocalValueEntry obj1, LocalValueEntry obj2)
        { 
          return !(obj1 == obj2);
        }

        ///  
        ///     Dependency property
        ///  
        public DependencyProperty Property 
        {
            get { return _dp; } 
        }

        /// 
        ///     Value of the property 
        /// 
        public object Value 
        { 
            get { return _value; }
        } 

        internal LocalValueEntry(DependencyProperty dp, object value)
        {
            _dp = dp; 
            _value = value;
        } 
 
        // Internal here because we need to change these around when building
        //  the snapshot for the LocalValueEnumerator, and we can't make internal 
        //  setters when we have public getters.
        internal DependencyProperty _dp;
        internal object _value;
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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