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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