DataKey.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / DataKey.cs / 1 / DataKey.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.Security.Permissions;

 
    /// 
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class DataKey : IStateManager { 

        private IOrderedDictionary _keyTable;
        private bool _isTracking;
        private string[] _keyNames; 

 
        public DataKey(IOrderedDictionary keyTable) { 
            _keyTable = keyTable;
        } 

        public DataKey(IOrderedDictionary keyTable, string[] keyNames) : this(keyTable) {
            _keyNames = keyNames;
        } 

 
        ///  
        /// Inheritable overridable implementation of IsTrackingViewState
        ///  
        protected virtual bool IsTrackingViewState {
            get {
                return _isTracking;
            } 
        }
 
        public virtual object this[int index] { 
            get {
                return _keyTable[index]; 
            }
        }

        public virtual object this[string name] { 
            get {
                return _keyTable[name]; 
            } 
        }
 

        public virtual object Value {
            get {
                if (_keyTable.Count > 0) { 
                    return _keyTable[0];
                } 
                return null; 
            }
        } 

        public virtual IOrderedDictionary Values {
            get {
                if (_keyTable is OrderedDictionary) { 
                    return ((OrderedDictionary)_keyTable).AsReadOnly();
                } 
 
                // don't return the actual table because we don't want the user to mess with it.
                if (_keyTable is ICloneable) { 
                    return (IOrderedDictionary)((ICloneable)_keyTable).Clone();
                }
                OrderedDictionary table = new OrderedDictionary();
 
                foreach (DictionaryEntry entry in _keyTable) {
                    table.Add(entry.Key, entry.Value); 
                } 
                return table.AsReadOnly();
            } 
        }


        ///  
        /// Inheritable overridable implementation of LoadViewState
        ///  
        protected virtual void LoadViewState(object state) { 
            if (state != null) {
                if (_keyNames != null) { 
                    object [] myState = (object [])state;
                    // if we have key names, then we only stored values.
                    if (myState[0] != null) {
                        for (int i = 0; i < myState.Length && i < _keyNames.Length; i++) { 
                            _keyTable.Add(_keyNames[i], myState[i]);
                        } 
                    } 
                }
                else { 
                    if (state != null) {
                        ArrayList stateArrayList = state as ArrayList;
                        if (stateArrayList == null) {
                            throw new HttpException(SR.GetString(SR.ViewState_InvalidViewState)); 
                        }
                        OrderedDictionaryStateHelper.LoadViewState(_keyTable, stateArrayList); 
                    } 
                }
            } 
        }


        ///  
        /// Inheritable overridable implementation of SaveViewState
        ///  
        protected virtual object SaveViewState() { 
            int count = _keyTable.Count;
            if (count > 0) { 
                object myState;
                if (_keyNames != null) {
                    // if we have key names, then we only have to store values.
                    myState = new object[count]; 

                    for (int i = 0; i < count; i++) { 
                        ((object[])myState)[i] = _keyTable[i]; 
                    }
                } 
                else {
                    myState = OrderedDictionaryStateHelper.SaveViewState(_keyTable);
                }
 
                return myState;
            } 
            return null; 
        }
 

        /// 
        /// Inheritable overridable implementation of TrackViewState
        ///  
        protected virtual void TrackViewState() {
            _isTracking = true; 
        } 

        #region IStateManager implementation 

        /// 
        bool IStateManager.IsTrackingViewState {
            get { 
                return IsTrackingViewState;
            } 
        } 

 
        /// 
        void IStateManager.LoadViewState(object state) {
            LoadViewState(state);
        } 

 
        ///  
        object IStateManager.SaveViewState() {
            return SaveViewState(); 
        }


        ///  
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        } 
        #endregion
    } 
}

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