DictionaryBase.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / DictionaryBase.cs / 1305376 / DictionaryBase.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//------------------------------------------------------------------------------
//----------------------------------------------------------------------------- 
// [....] 
//
 
namespace System.Collections {

    using System;
    using System.Security.Permissions; 

    // Useful base class for typed read/write collections where items derive from object 
    [Serializable] 
[System.Runtime.InteropServices.ComVisible(true)]
    public abstract class DictionaryBase : IDictionary { 
        Hashtable hashtable;

        protected Hashtable InnerHashtable {
            get { 
                if (hashtable == null)
                    hashtable = new Hashtable(); 
                return hashtable; 
            }
        } 

        protected IDictionary Dictionary {
            get { return (IDictionary) this; }
        } 

        public int Count { 
            // to avoid newing inner list if no items are ever added 
            get { return hashtable == null ? 0 : hashtable.Count; }
        } 

        bool IDictionary.IsReadOnly {
            get { return InnerHashtable.IsReadOnly; }
        } 

        bool IDictionary.IsFixedSize { 
            get { return InnerHashtable.IsFixedSize; } 
        }
 
        bool ICollection.IsSynchronized {
            get { return InnerHashtable.IsSynchronized; }
        }
 
        ICollection IDictionary.Keys {
            get { 
                return InnerHashtable.Keys; 
            }
        } 

        Object ICollection.SyncRoot {
            get { return InnerHashtable.SyncRoot; }
        } 

        ICollection IDictionary.Values { 
            get { 
                return InnerHashtable.Values;
            } 
        }

        public void CopyTo(Array array, int index) {
            InnerHashtable.CopyTo(array, index); 
        }
 
        object IDictionary.this[object key] { 
            get {
                object currentValue = InnerHashtable[key]; 
                OnGet(key, currentValue);
                return currentValue;
            }
            set { 
                OnValidate(key, value);
                bool keyExists = true; 
                Object temp = InnerHashtable[key]; 
                if( temp == null) {
                    keyExists = InnerHashtable.Contains(key); 
                }

                OnSet(key, temp, value);
                InnerHashtable[key] = value; 
                try {
                    OnSetComplete(key, temp, value); 
                } 
                catch {
                   if( keyExists) { 
                       InnerHashtable[key] = temp;
                   }
                   else {
                       InnerHashtable.Remove(key); 
                   }
                   throw; 
                } 
            }
        } 

        bool IDictionary.Contains(object key) {
            return InnerHashtable.Contains(key);
        } 

        void IDictionary.Add(object key, object value) { 
            OnValidate(key, value); 
            OnInsert(key, value);
            InnerHashtable.Add(key, value); 
            try {
                OnInsertComplete(key, value);
            }
            catch { 
                InnerHashtable.Remove(key);
                throw; 
            } 
        }
 
        public void Clear() {
            OnClear();
            InnerHashtable.Clear();
            OnClearComplete(); 
        }
 
        void IDictionary.Remove(object key) { 
            if(InnerHashtable.Contains(key)) {
                Object temp = InnerHashtable[key]; 
                OnValidate(key, temp);
                OnRemove(key, temp);

                InnerHashtable.Remove(key); 
                try {
                    OnRemoveComplete(key, temp); 
                } 
                catch {
                    InnerHashtable.Add(key, temp); 
                    throw;
                }
            }
        } 

        public IDictionaryEnumerator GetEnumerator() { 
            return InnerHashtable.GetEnumerator(); 
        }
 
        IEnumerator IEnumerable.GetEnumerator() {
            return InnerHashtable.GetEnumerator();
        }
 
        protected virtual object OnGet(object key, object currentValue) {
            return currentValue; 
        } 

        protected virtual void OnSet(object key, object oldValue, object newValue) { 
        }

        protected virtual void OnInsert(object key, object value) {
        } 

        protected virtual void OnClear() { 
        } 

        protected virtual void OnRemove(object key, object value) { 
        }

        protected virtual void OnValidate(object key, object value) {
        } 

        protected virtual void OnSetComplete(object key, object oldValue, object newValue) { 
        } 

        protected virtual void OnInsertComplete(object key, object value) { 
        }

        protected virtual void OnClearComplete() {
        } 

        protected virtual void OnRemoveComplete(object key, object value) { 
        } 

    } 

}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DictionaryBase.cs source code in C# .NET

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