TraceLevelStore.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / TraceLevelStore.cs / 1 / TraceLevelStore.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Storage for the "TraceLevel" attached property. 
// 
//---------------------------------------------------------------------------
 
using System;
using System.Collections.Generic;
using System.Diagnostics;
 
namespace MS.Internal
{ 
    ///  
    /// This class stores values for the attached property
    /// PresentationTraceSources.TraceLevel. 
    /// 
    internal static class TraceLevelStore
    {
        #region Constructors 

        // 
        //  Constructors 
        //
 
        #endregion Constructors

        #region Internal Methods
 
        //
        //  Internal Methods 
        // 

        ///  
        /// Reads the attached property TraceLevel from the given element.
        /// 
        internal static PresentationTraceLevel GetTraceLevel(object element)
        { 
            PresentationTraceLevel result;
 
            if (element == null || _dictionary.Count == 0) 
            {
                result = PresentationTraceLevel.None; 
            }
            else
            {
                lock (_dictionary) 
                {
                    Key key = new Key(element); 
                    if (!_dictionary.TryGetValue(key, out result)) 
                    {
                        result = PresentationTraceLevel.None; 
                    }
                }
            }
 
            return result;
        } 
 
        /// 
        /// Writes the attached property TraceLevel to the given element. 
        /// 
        internal static void SetTraceLevel(object element, PresentationTraceLevel traceLevel)
        {
            if (element == null) 
                return;
 
            lock (_dictionary) 
            {
                Key key = new Key(element, true); 

                if (traceLevel > PresentationTraceLevel.None)
                {
                    _dictionary[key] = traceLevel; 
                }
                else 
                { 
                    _dictionary.Remove(key);
                } 
            }
        }

        #endregion Internal Methods 

        #region Private Fields 
 
        //
        //  Private Fields 
        //

        private static Dictionary _dictionary = new Dictionary();
 
        #endregion Private Fields
 
        #region Table Keys 

        // the key for the dictionary:  <((element)), hashcode> 
        private struct Key
        {
            internal Key(object element, bool useWeakRef)
            { 
                _element = new WeakReference(element);
                _hashcode = element.GetHashCode(); 
            } 

            internal Key(object element) 
            {
                _element = element;
                _hashcode = element.GetHashCode();
            } 

            public override int GetHashCode() 
            { 
#if DEBUG
                WeakReference wr = _element as WeakReference; 
                object element = (wr != null) ? wr.Target : _element;
                if (element != null)
                {
                    int hashcode = element.GetHashCode(); 
                    Debug.Assert(hashcode == _hashcode, "hashcodes disagree");
                } 
#endif 

                return _hashcode; 
            }

            public override bool Equals(object o)
            { 
                if (o is Key)
                { 
                    WeakReference wr; 
                    Key that = (Key)o;
 
                    if (this._hashcode != that._hashcode)
                        return false;

                    wr = this._element as WeakReference; 
                    object s1 = (wr != null) ? wr.Target : this._element;
                    wr = that._element as WeakReference; 
                    object s2 = (wr != null) ? wr.Target : that._element; 

                    if (s1!=null && s2!=null) 
                        return (s1 == s2);
                    else
                        return (this._element == that._element);
                } 
                else
                { 
                    return false; 
                }
            } 

            public static bool operator==(Key key1, Key key2)
            {
                return key1.Equals(key2); 
            }
 
            public static bool operator!=(Key key1, Key key2) 
            {
                return !key1.Equals(key2); 
            }

            object _element;            // lookup: direct ref.  In table: WeakRef
            int _hashcode;              // cached, in case source is GC'd 
        }
 
        #endregion Table Keys 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Storage for the "TraceLevel" attached property. 
// 
//---------------------------------------------------------------------------
 
using System;
using System.Collections.Generic;
using System.Diagnostics;
 
namespace MS.Internal
{ 
    ///  
    /// This class stores values for the attached property
    /// PresentationTraceSources.TraceLevel. 
    /// 
    internal static class TraceLevelStore
    {
        #region Constructors 

        // 
        //  Constructors 
        //
 
        #endregion Constructors

        #region Internal Methods
 
        //
        //  Internal Methods 
        // 

        ///  
        /// Reads the attached property TraceLevel from the given element.
        /// 
        internal static PresentationTraceLevel GetTraceLevel(object element)
        { 
            PresentationTraceLevel result;
 
            if (element == null || _dictionary.Count == 0) 
            {
                result = PresentationTraceLevel.None; 
            }
            else
            {
                lock (_dictionary) 
                {
                    Key key = new Key(element); 
                    if (!_dictionary.TryGetValue(key, out result)) 
                    {
                        result = PresentationTraceLevel.None; 
                    }
                }
            }
 
            return result;
        } 
 
        /// 
        /// Writes the attached property TraceLevel to the given element. 
        /// 
        internal static void SetTraceLevel(object element, PresentationTraceLevel traceLevel)
        {
            if (element == null) 
                return;
 
            lock (_dictionary) 
            {
                Key key = new Key(element, true); 

                if (traceLevel > PresentationTraceLevel.None)
                {
                    _dictionary[key] = traceLevel; 
                }
                else 
                { 
                    _dictionary.Remove(key);
                } 
            }
        }

        #endregion Internal Methods 

        #region Private Fields 
 
        //
        //  Private Fields 
        //

        private static Dictionary _dictionary = new Dictionary();
 
        #endregion Private Fields
 
        #region Table Keys 

        // the key for the dictionary:  <((element)), hashcode> 
        private struct Key
        {
            internal Key(object element, bool useWeakRef)
            { 
                _element = new WeakReference(element);
                _hashcode = element.GetHashCode(); 
            } 

            internal Key(object element) 
            {
                _element = element;
                _hashcode = element.GetHashCode();
            } 

            public override int GetHashCode() 
            { 
#if DEBUG
                WeakReference wr = _element as WeakReference; 
                object element = (wr != null) ? wr.Target : _element;
                if (element != null)
                {
                    int hashcode = element.GetHashCode(); 
                    Debug.Assert(hashcode == _hashcode, "hashcodes disagree");
                } 
#endif 

                return _hashcode; 
            }

            public override bool Equals(object o)
            { 
                if (o is Key)
                { 
                    WeakReference wr; 
                    Key that = (Key)o;
 
                    if (this._hashcode != that._hashcode)
                        return false;

                    wr = this._element as WeakReference; 
                    object s1 = (wr != null) ? wr.Target : this._element;
                    wr = that._element as WeakReference; 
                    object s2 = (wr != null) ? wr.Target : that._element; 

                    if (s1!=null && s2!=null) 
                        return (s1 == s2);
                    else
                        return (this._element == that._element);
                } 
                else
                { 
                    return false; 
                }
            } 

            public static bool operator==(Key key1, Key key2)
            {
                return key1.Equals(key2); 
            }
 
            public static bool operator!=(Key key1, Key key2) 
            {
                return !key1.Equals(key2); 
            }

            object _element;            // lookup: direct ref.  In table: WeakRef
            int _hashcode;              // cached, in case source is GC'd 
        }
 
        #endregion Table Keys 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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TraceLevelStore.cs source code in C# .NET

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