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diff --git a/src/DotNetOpenAuth.Core/Messaging/ReadOnlyDictionary.cs b/src/DotNetOpenAuth.Core/Messaging/ReadOnlyDictionary.cs
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+//-----------------------------------------------------------------------
+// <copyright file="ReadOnlyDictionary.cs" company="Microsoft Corporation">
+// Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+ using System;
+ using System.Collections.Generic;
+
+ /// <summary>
+ /// Represents a read-only dictionary.
+ /// </summary>
+ /// <typeparam name="K">The type of the key.</typeparam>
+ /// <typeparam name="V">The type of the value.</typeparam>
+ internal class ReadOnlyDictionary<K, V> : IDictionary<K, V> {
+ /// <summary>
+ /// Contains base dictionary.
+ /// </summary>
+ private readonly IDictionary<K, V> baseDictionary;
+
+ /// <summary>
+ /// Initializes a new instance of the <see cref="ReadOnlyDictionary&lt;K, V&gt;"/> class.
+ /// </summary>
+ /// <param name="baseDictionary">The base dictionary.</param>
+ public ReadOnlyDictionary(IDictionary<K, V> baseDictionary) {
+ this.baseDictionary = baseDictionary;
+ }
+
+ /// <summary>
+ /// Gets an <see cref="T:System.Collections.Generic.ICollection`1"/> containing the keys of the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </summary>
+ /// <returns>
+ /// An <see cref="T:System.Collections.Generic.ICollection`1"/> containing the keys of the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </returns>
+ public ICollection<K> Keys {
+ get { return this.baseDictionary.Keys; }
+ }
+
+ /// <summary>
+ /// Gets an <see cref="T:System.Collections.Generic.ICollection`1"/> containing the values in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </summary>
+ /// <returns>
+ /// An <see cref="T:System.Collections.Generic.ICollection`1"/> containing the values in the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </returns>
+ public ICollection<V> Values {
+ get { return this.baseDictionary.Values; }
+ }
+
+ /// <summary>
+ /// Gets the number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </summary>
+ /// <returns>
+ /// The number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </returns>
+ public int Count {
+ get { return this.baseDictionary.Count; }
+ }
+
+ /// <summary>
+ /// Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
+ /// </summary>
+ /// <returns>true if the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only; otherwise, false.
+ /// </returns>
+ public bool IsReadOnly {
+ get { return true; }
+ }
+
+ /// <summary>
+ /// Gets or sets the element with the specified key.
+ /// </summary>
+ /// <param name="key">The key being read or written.</param>
+ /// <returns>
+ /// The element with the specified key.
+ /// </returns>
+ /// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.
+ /// </exception>
+ /// <exception cref="T:System.Collections.Generic.KeyNotFoundException">
+ /// The property is retrieved and <paramref name="key"/> is not found.
+ /// </exception>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The property is set and the <see cref="T:System.Collections.Generic.IDictionary`2"/> is read-only.
+ /// </exception>
+ public V this[K key] {
+ get { return this.baseDictionary[key]; }
+ set { throw new NotSupportedException(); }
+ }
+
+ /// <summary>
+ /// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </summary>
+ /// <param name="key">The object to use as the key of the element to add.</param>
+ /// <param name="value">The object to use as the value of the element to add.</param>
+ /// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.
+ /// </exception>
+ /// <exception cref="T:System.ArgumentException">
+ /// An element with the same key already exists in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </exception>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The <see cref="T:System.Collections.Generic.IDictionary`2"/> is read-only.
+ /// </exception>
+ public void Add(K key, V value) {
+ throw new NotSupportedException();
+ }
+
+ /// <summary>
+ /// Determines whether the <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the specified key.
+ /// </summary>
+ /// <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2"/>.</param>
+ /// <returns>
+ /// true if the <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the key; otherwise, false.
+ /// </returns>
+ /// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.
+ /// </exception>
+ public bool ContainsKey(K key) {
+ return this.baseDictionary.ContainsKey(key);
+ }
+
+ /// <summary>
+ /// Removes the element with the specified key from the <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </summary>
+ /// <param name="key">The key of the element to remove.</param>
+ /// <returns>
+ /// true if the element is successfully removed; otherwise, false. This method also returns false if <paramref name="key"/> was not found in the original <see cref="T:System.Collections.Generic.IDictionary`2"/>.
+ /// </returns>
+ /// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.
+ /// </exception>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The <see cref="T:System.Collections.Generic.IDictionary`2"/> is read-only.
+ /// </exception>
+ public bool Remove(K key) {
+ throw new NotSupportedException();
+ }
+
+ /// <summary>
+ /// Gets the value associated with the specified key.
+ /// </summary>
+ /// <param name="key">The key whose value to get.</param>
+ /// <param name="value">When this method returns, the value associated with the specified key, if the key is found; otherwise, the default value for the type of the <paramref name="value"/> parameter. This parameter is passed uninitialized.</param>
+ /// <returns>
+ /// true if the object that implements <see cref="T:System.Collections.Generic.IDictionary`2"/> contains an element with the specified key; otherwise, false.
+ /// </returns>
+ /// <exception cref="T:System.ArgumentNullException"><paramref name="key"/> is null.
+ /// </exception>
+ public bool TryGetValue(K key, out V value) {
+ return this.baseDictionary.TryGetValue(key, out value);
+ }
+
+ /// <summary>
+ /// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </summary>
+ /// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
+ /// </exception>
+ public void Add(KeyValuePair<K, V> item) {
+ throw new NotSupportedException();
+ }
+
+ /// <summary>
+ /// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </summary>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
+ /// </exception>
+ public void Clear() {
+ throw new NotSupportedException();
+ }
+
+ /// <summary>
+ /// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1"/> contains a specific value.
+ /// </summary>
+ /// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
+ /// <returns>
+ /// true if <paramref name="item"/> is found in the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false.
+ /// </returns>
+ public bool Contains(KeyValuePair<K, V> item) {
+ return this.baseDictionary.Contains(item);
+ }
+
+ /// <summary>
+ /// Copies to.
+ /// </summary>
+ /// <param name="array">The array.</param>
+ /// <param name="arrayIndex">Index of the array.</param>
+ public void CopyTo(KeyValuePair<K, V>[] array, int arrayIndex) {
+ this.baseDictionary.CopyTo(array, arrayIndex);
+ }
+
+ /// <summary>
+ /// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </summary>
+ /// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
+ /// <returns>
+ /// true if <paramref name="item"/> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false. This method also returns false if <paramref name="item"/> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1"/>.
+ /// </returns>
+ /// <exception cref="T:System.NotSupportedException">
+ /// The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
+ /// </exception>
+ public bool Remove(KeyValuePair<K, V> item) {
+ throw new NotSupportedException();
+ }
+
+ /// <summary>
+ /// Returns an enumerator that iterates through the collection.
+ /// </summary>
+ /// <returns>
+ /// A <see cref="T:System.Collections.Generic.IEnumerator`1"/> that can be used to iterate through the collection.
+ /// </returns>
+ public IEnumerator<KeyValuePair<K, V>> GetEnumerator() {
+ return this.baseDictionary.GetEnumerator();
+ }
+
+ /// <summary>
+ /// Returns an enumerator that iterates through a collection.
+ /// </summary>
+ /// <returns>
+ /// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
+ /// </returns>
+ System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
+ return this.baseDictionary.GetEnumerator();
+ }
+ }
+} \ No newline at end of file