SortDescription.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / ComponentModel / SortDescription.cs / 2 / SortDescription.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) 2003 by Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Defines property and direction to sort. 
//
// See spec at [....]/connecteddata/M5%20Specs/IDataCollection.mht 
//
// History:
//  06/02/2003 : [....] - Created
// 
//---------------------------------------------------------------------------
 
using System; 
using System.ComponentModel;
using System.Windows;           // SR 

namespace System.ComponentModel
{
    ///  
    /// Defines a property and direction to sort a list by.
    ///  
    public struct SortDescription 
    {
        //----------------------------------------------------- 
        //
        //  Public Constructors
        //
        //----------------------------------------------------- 

        #region Public Constructors 
 
        /// 
        /// Create a sort description. 
        /// 
        /// Property to sort by
        /// Specifies the direction of sort operation
        ///  direction is not a valid value for ListSortDirection  
        public SortDescription(string propertyName, ListSortDirection direction)
        { 
            if (direction != ListSortDirection.Ascending && direction != ListSortDirection.Descending) 
                throw new InvalidEnumArgumentException("direction", (int)direction, typeof(ListSortDirection));
 
            _propertyName = propertyName;
            _direction = direction;
            _sealed = false;
        } 

        #endregion Public Constructors 
 

        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //----------------------------------------------------- 

        #region Public Properties 
 
        /// 
        /// Property name to sort by. 
        /// 
        public string PropertyName
        {
            get { return _propertyName; } 
            set
            { 
                if (_sealed) 
                    throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "SortDescription"));
 
                _propertyName = value;
            }
        }
 
        /// 
        /// Sort direction. 
        ///  
        public ListSortDirection Direction
        { 
            get { return _direction; }
            set
            {
                if (_sealed) 
                    throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "SortDescription"));
 
                if (value < ListSortDirection.Ascending || value > ListSortDirection.Descending) 
                    throw new InvalidEnumArgumentException("value", (int) value, typeof(ListSortDirection));
 
                _direction = value;
            }
        }
 
        /// 
        /// Returns true if the SortDescription is in use (sealed). 
        ///  
        public bool IsSealed
        { 
            get { return _sealed; }
        }

        #endregion Public Properties 

        //------------------------------------------------------ 
        // 
        //  Public methods
        // 
        //------------------------------------------------------

        #region Public Methods
 
        ///  Override of Object.Equals 
        public override bool Equals(object obj) 
        { 
            return (obj is SortDescription) ? (this == (SortDescription)obj) : false;
        } 

        ///  Equality operator for SortDescription. 
        public static bool operator==(SortDescription sd1, SortDescription sd2)
        { 
            return  sd1.PropertyName == sd2.PropertyName &&
                    sd1.Direction == sd2.Direction; 
        } 

        ///  Inequality operator for SortDescription.  
        public static bool operator!=(SortDescription sd1, SortDescription sd2)
        {
            return !(sd1 == sd2);
        } 

        ///  Override of Object.GetHashCode  
        public override int GetHashCode() 
        {
            return unchecked(PropertyName.GetHashCode() + Direction.GetHashCode()); 
        }

        #endregion Public Methods
 
        //-----------------------------------------------------
        // 
        //  Internal methods 
        //
        //------------------------------------------------------ 

        #region Internal Methods

        internal void Seal() 
        {
            _sealed = true; 
        } 

        #endregion Internal Methods 

        //-----------------------------------------------------
        //
        //  Private Fields 
        //
        //----------------------------------------------------- 
 
        #region Private Fields
 
        private string              _propertyName;
        private ListSortDirection   _direction;
        bool                        _sealed;
 
        #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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SortDescription.cs source code in C# .NET

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