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//------------------------------------------------------------
// 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);
}
}
}
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