ReadOnlyDictionary.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Utils / ReadOnlyDictionary.cs / 1305376 / ReadOnlyDictionary.cs
                        
                        
                            /* **************************************************************************** 
 *
 * Copyright (c) Microsoft Corporation.
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 * 
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/ 

using System.Collections.Generic; 
using System.Linq.Expressions; 

#if SILVERLIGHT 
using System.Core;
#endif

namespace System.Dynamic.Utils { 

    // Like ReadOnlyCollection: wraps an IDictionary in a read-only wrapper 
    internal sealed class ReadOnlyDictionary : IDictionary { 

        // For wrapping non-readonly Keys, Values collections 
        // Not used for standard dictionaries, which return read-only Keys and Values
        private sealed class ReadOnlyWrapper : ICollection {
            // no idea why this warning is here
            [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1823:AvoidUnusedPrivateFields")] 
            private readonly ICollection _collection;
 
            internal ReadOnlyWrapper(ICollection collection) { 
                _collection = collection;
            } 

            #region ICollection Members

            public void Add(T item) { 
                throw Error.CollectionReadOnly();
            } 
 
            public void Clear() {
                throw Error.CollectionReadOnly(); 
            }

            public bool Contains(T item) {
                return _collection.Contains(item); 
            }
 
            public void CopyTo(T[] array, int arrayIndex) { 
                _collection.CopyTo(array, arrayIndex);
            } 

            public int Count {
                get { return _collection.Count; }
            } 

            public bool IsReadOnly { 
                get { return true; } 
            }
 
            public bool Remove(T item) {
                throw Error.CollectionReadOnly();
            }
 
            #endregion
 
            #region IEnumerable Members 

            public IEnumerator GetEnumerator() { 
                return _collection.GetEnumerator();
            }

            #endregion 

            #region IEnumerable Members 
 
            System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
                return _collection.GetEnumerator(); 
            }

            #endregion
        } 

        private readonly IDictionary _dict; 
 
        internal ReadOnlyDictionary(IDictionary dict) {
            ReadOnlyDictionary rodict = dict as ReadOnlyDictionary; 
            _dict = (rodict != null) ? rodict._dict : dict;
        }

        #region IDictionary Members 

        public bool ContainsKey(K key) { 
            return _dict.ContainsKey(key); 
        }
 
        public ICollection Keys {
            get {
                ICollection keys = _dict.Keys;
                if (!keys.IsReadOnly) { 
                    return new ReadOnlyWrapper(keys);
                } 
                return keys; 
            }
        } 

        public bool TryGetValue(K key, out V value) {
            return _dict.TryGetValue(key, out value);
        } 

        public ICollection Values { 
            get { 
                ICollection values = _dict.Values;
                if (!values.IsReadOnly) { 
                    return new ReadOnlyWrapper(values);
                }
                return values;
            } 
        }
 
        public V this[K key] { 
            get {
                return _dict[key]; 
            }
        }

 
        void IDictionary.Add(K key, V value) {
            throw Error.CollectionReadOnly(); 
        } 

        bool IDictionary.Remove(K key) { 
            throw Error.CollectionReadOnly();
        }

        V IDictionary.this[K key] { 
            get {
                return _dict[key]; 
            } 
            set {
                throw Error.CollectionReadOnly(); 
            }
        }

        #endregion 

        #region ICollection> Members 
 
        public bool Contains(KeyValuePair item) {
            return _dict.Contains(item); 
        }

        public void CopyTo(KeyValuePair[] array, int arrayIndex) {
            _dict.CopyTo(array, arrayIndex); 
        }
 
        public int Count { 
            get { return _dict.Count; }
        } 

        public bool IsReadOnly {
            get { return true; }
        } 

        void ICollection>.Add(KeyValuePair item) { 
            throw Error.CollectionReadOnly(); 
        }
 
        void ICollection>.Clear() {
            throw Error.CollectionReadOnly();
        }
 
        bool ICollection>.Remove(KeyValuePair item) {
            throw Error.CollectionReadOnly(); 
        } 

        #endregion 

        #region IEnumerable> Members

        public IEnumerator> GetEnumerator() { 
            return _dict.GetEnumerator();
        } 
 
        #endregion
 
        #region IEnumerable Members

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
            return _dict.GetEnumerator(); 
        }
 
        #endregion 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ReadOnlyDictionary.cs source code in C# .NET

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