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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
namespace System.Runtime.InteropServices.WindowsRuntime
{
[Serializable]
[DebuggerDisplay("Count = {Count}")]
internal sealed class DictionaryKeyCollection<TKey, TValue> : ICollection<TKey>
{
private readonly IDictionary<TKey, TValue> dictionary;
public DictionaryKeyCollection(IDictionary<TKey, TValue> dictionary)
{
if (dictionary == null)
throw new ArgumentNullException(nameof(dictionary));
this.dictionary = dictionary;
}
public void CopyTo(TKey[] array, int index)
{
if (array == null)
throw new ArgumentNullException(nameof(array));
if (index < 0)
throw new ArgumentOutOfRangeException(nameof(index));
if (array.Length <= index && this.Count > 0)
throw new ArgumentException(SR.Arg_IndexOutOfRangeException);
if (array.Length - index < dictionary.Count)
throw new ArgumentException(SR.Argument_InsufficientSpaceToCopyCollection);
int i = index;
foreach (KeyValuePair<TKey, TValue> mapping in dictionary)
{
array[i++] = mapping.Key;
}
}
public int Count
{
get { return dictionary.Count; }
}
bool ICollection<TKey>.IsReadOnly
{
get { return true; }
}
void ICollection<TKey>.Add(TKey item)
{
throw new NotSupportedException(SR.NotSupported_KeyCollectionSet);
}
void ICollection<TKey>.Clear()
{
throw new NotSupportedException(SR.NotSupported_KeyCollectionSet);
}
public bool Contains(TKey item)
{
return dictionary.ContainsKey(item);
}
bool ICollection<TKey>.Remove(TKey item)
{
throw new NotSupportedException(SR.NotSupported_KeyCollectionSet);
}
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable<TKey>)this).GetEnumerator();
}
public IEnumerator<TKey> GetEnumerator()
{
return new DictionaryKeyEnumerator<TKey, TValue>(dictionary);
}
} // public class DictionaryKeyCollection<TKey, TValue>
[Serializable]
internal sealed class DictionaryKeyEnumerator<TKey, TValue> : IEnumerator<TKey>
{
private readonly IDictionary<TKey, TValue> dictionary;
private IEnumerator<KeyValuePair<TKey, TValue>> enumeration;
public DictionaryKeyEnumerator(IDictionary<TKey, TValue> dictionary)
{
if (dictionary == null)
throw new ArgumentNullException(nameof(dictionary));
this.dictionary = dictionary;
enumeration = dictionary.GetEnumerator();
}
void IDisposable.Dispose()
{
enumeration.Dispose();
}
public bool MoveNext()
{
return enumeration.MoveNext();
}
Object IEnumerator.Current
{
get { return ((IEnumerator<TKey>)this).Current; }
}
public TKey Current
{
get { return enumeration.Current.Key; }
}
public void Reset()
{
enumeration = dictionary.GetEnumerator();
}
} // class DictionaryKeyEnumerator<TKey, TValue>
}
// DictionaryKeyCollection.cs
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