DependencyPropertyAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / ComponentModel / DependencyPropertyAttribute.cs / 1 / DependencyPropertyAttribute.cs
                        

                        
                             
namespace MS.Internal.ComponentModel
{
    using System;
    using System.Windows; 

    ///  
    ///     This attribute is synthesized by our DependencyObjectProvider 
    ///     to relate a property descriptor back to a dependency property.
    ///  
    [AttributeUsage(AttributeTargets.Method)]
    internal sealed class DependencyPropertyAttribute : Attribute
    {
 
        //------------------------------------------------------
        // 
        //  Constructors 
        //
        //----------------------------------------------------- 

        #region Constructors

        ///  
        ///     Creates a new DependencyPropertyAttribute for the given dependency property.
        ///  
        internal DependencyPropertyAttribute(DependencyProperty dependencyProperty, bool isAttached) 
        {
            if (dependencyProperty == null) throw new ArgumentNullException("dependencyProperty"); 

            _dp = dependencyProperty;
            _isAttached = isAttached;
        } 

        #endregion Constructors 
 
        //-----------------------------------------------------
        // 
        //  Public Methods
        //
        //-----------------------------------------------------
 
        #region Public Methods
 
        ///  
        ///     Override of Object.Equals that returns true when the dependency
        ///     property contained within each attribute is the same. 
        /// 
        public override bool Equals(object value)
        {
            DependencyPropertyAttribute da = value as DependencyPropertyAttribute; 

            if (da != null && 
                object.ReferenceEquals(da._dp, _dp) && 
                da._isAttached == _isAttached)
            { 
                return true;
            }

            return false; 
        }
 
        ///  
        ///     Override of Object.GetHashCode();
        ///  
        public override int GetHashCode()
        {
            return _dp.GetHashCode();
        } 

        #endregion Public Methods 
 
        //------------------------------------------------------
        // 
        //  Public Operators
        //
        //-----------------------------------------------------
 
        //------------------------------------------------------
        // 
        //  Public Properties 
        //
        //------------------------------------------------------ 

        #region Public Properties

        ///  
        ///     Overrides Attribute.TypeId to be unique with respect to
        ///     other dependency property attributes.c 
        ///  
        public override object TypeId
        { 
            get { return typeof(DependencyPropertyAttribute); }
        }

        #endregion Public Properties 

 
        //----------------------------------------------------- 
        //
        //  Public Events 
        //
        //------------------------------------------------------

        //----------------------------------------------------- 
        //
        //  Internal Properties 
        // 
        //-----------------------------------------------------
 
        #region Internal Properties

        /// 
        ///     Returns whether the dependency property is an attached 
        ///     property.
        ///  
        internal bool IsAttached 
        {
            get { return _isAttached; } 
        }

        /// 
        ///     Returns the dependency property instance this attribute is 
        ///     associated with.
        ///  
        internal DependencyProperty DependencyProperty 
        {
            get { return _dp; } 
        }

        #endregion Internal Properties
 
        //-----------------------------------------------------
        // 
        //  Private Fields 
        //
        //------------------------------------------------------ 

        #region Private Fields

        private DependencyProperty _dp; 
        private bool _isAttached;
 
        #endregion Private Fields 
    }
} 


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

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