DictionaryItemsCollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / DictionaryItemsCollection.cs / 1305376 / DictionaryItemsCollection.cs
                        

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

namespace System.Activities.Presentation 
{
    using System.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.Runtime;
 
    class DictionaryItemsCollection : Collection>
    {
        IDictionary dictionary;
 
        public DictionaryItemsCollection(object dictionary)
        { 
            this.dictionary = dictionary as IDictionary; 
            Fx.Assert(this.dictionary != null, "dictionary should be instantiated");
            foreach (KeyValuePair kvpair in this.dictionary) 
            {
                ModelItemKeyValuePair item = new ModelItemKeyValuePair(kvpair.Key, kvpair.Value);
                item.collection = this;
                base.InsertItem(this.Count, item); 
            }
        } 
 
        internal void PostUpdateKey()
        { 
            this.UpdateDictionary();
        }

        internal void PreUpdateKey(TKey oldKey, TKey newKey) 
        {
            this.dictionary.Remove(oldKey); 
            if (this.dictionary.ContainsKey(newKey)) 
            {
                this.UpdateDictionary(); 
                throw FxTrace.Exception.AsError(new ArgumentException(SR.DuplicateKey));
            }
        }
 
        internal void UpdateValue(TKey key, TValue value)
        { 
            this.dictionary[key] = value; 
        }
 
        protected override void ClearItems()
        {
            this.dictionary.Clear();
            base.ClearItems(); 
        }
 
        protected override void InsertItem(int index, ModelItemKeyValuePair item) 
        {
            if (item == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
            }
 
            if (this.dictionary.ContainsKey(item.Key))
            { 
                throw FxTrace.Exception.AsError(new ArgumentException(SR.DuplicateKey)); 
            }
 
            item.collection = this;
            base.InsertItem(index, item);
            this.UpdateDictionary();
        } 

        protected override void RemoveItem(int index) 
        { 
            ModelItemKeyValuePair item = this[index];
            Fx.Assert(item != null, "Item should not be null."); 
            this.dictionary.Remove(item.Key);
            base.RemoveItem(index);
        }
 
        protected override void SetItem(int index, ModelItemKeyValuePair item)
        { 
            if (item == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("item")); 
            }
            item.collection = this;
            ModelItemKeyValuePair oldItem = this[index];
            Fx.Assert(oldItem != null, "Item should not be null."); 
            this.PreUpdateKey(oldItem.Key, item.Key);
            base.SetItem(index, item); 
            this.PostUpdateKey(); 
        }
 
        void UpdateDictionary()
        {
            // Make sure the order of KVPairs in the dictionary is the same as the order of items in the collection
            this.dictionary.Clear(); 
            foreach (ModelItemKeyValuePair item in this)
            { 
                this.dictionary.Add(new KeyValuePair(item.Key, item.Value)); 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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