Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel.Internals/System/Runtime/ReadOnlyDictionaryInternal.cs

@@ -0,0 +1,125 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.Runtime
+{
+    using System.Collections;
+    using System.Collections.Generic;
+
+    // This class is for back-compat with 4.0, where we exposed read-only dictionaries that threw
+    // InvalidOperation if mutated. Any new usages should use the CLR's public ReadOnlyDictionary
+    // (which throws NotSupported).
+    [Serializable]
+    class ReadOnlyDictionaryInternal<TKey, TValue> : IDictionary<TKey, TValue>
+    {
+        IDictionary<TKey, TValue> dictionary;
+
+        public ReadOnlyDictionaryInternal(IDictionary<TKey, TValue> dictionary)
+        {
+            this.dictionary = dictionary;
+        }
+
+        public int Count
+        {
+            get { return this.dictionary.Count; }
+        }
+
+        public bool IsReadOnly
+        {
+            get { return true; }
+        }
+
+        public ICollection<TKey> Keys
+        {
+            get { return this.dictionary.Keys; }
+        }
+
+        public ICollection<TValue> Values
+        {
+            get { return this.dictionary.Values; }
+        }
+
+        public TValue this[TKey key]
+        {
+            get
+            {
+                return this.dictionary[key];
+            }
+            set
+            {
+                throw Fx.Exception.AsError(CreateReadOnlyException());
+            }
+        }
+
+        public static IDictionary<TKey, TValue> Create(IDictionary<TKey, TValue> dictionary)
+        {
+            if (dictionary.IsReadOnly)
+            {
+                return dictionary;
+            }
+            else
+            {
+                return new ReadOnlyDictionaryInternal<TKey, TValue>(dictionary);
+            }
+        }
+
+        Exception CreateReadOnlyException()
+        {
+            return new InvalidOperationException(InternalSR.DictionaryIsReadOnly);
+        }
+
+        public void Add(TKey key, TValue value)
+        {
+            throw Fx.Exception.AsError(CreateReadOnlyException());
+        }
+
+        public void Add(KeyValuePair<TKey, TValue> item)
+        {
+            throw Fx.Exception.AsError(CreateReadOnlyException());
+        }
+
+        public void Clear()
+        {
+            throw Fx.Exception.AsError(CreateReadOnlyException());
+        }
+
+        public bool Contains(KeyValuePair<TKey, TValue> item)
+        {
+            return this.dictionary.Contains(item);
+        }
+        public bool ContainsKey(TKey key)
+        {
+            return this.dictionary.ContainsKey(key);
+        }
+
+        public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
+        {
+            this.dictionary.CopyTo(array, arrayIndex);
+        }
+
+        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
+        {
+            return this.dictionary.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return this.GetEnumerator();
+        }
+
+        public bool Remove(TKey key)
+        {
+            throw Fx.Exception.AsError(CreateReadOnlyException());
+        }
+
+        public bool Remove(KeyValuePair<TKey, TValue> item)
+        {
+            throw Fx.Exception.AsError(CreateReadOnlyException());
+        }
+
+        public bool TryGetValue(TKey key, out TValue value)
+        {
+            return this.dictionary.TryGetValue(key, out value);
+        }
+    }
+}