/
CollectionBase.cs
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/
CollectionBase.cs
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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.
/*=============================================================================
**
** Class: CollectionBase
**
** Purpose: Provides the abstract base class for a strongly typed collection.
**
=============================================================================*/
namespace System.Collections
{
// Useful base class for typed read/write collections where items derive from object
public abstract class CollectionBase : IList
{
private readonly ArrayList _list;
protected CollectionBase()
{
_list = new ArrayList();
}
protected CollectionBase(int capacity)
{
_list = new ArrayList(capacity);
}
protected ArrayList InnerList
{
get
{
return _list;
}
}
protected IList List
{
get { return (IList)this; }
}
public int Capacity
{
get
{
return InnerList.Capacity;
}
set
{
InnerList.Capacity = value;
}
}
public int Count
{
get
{
return _list.Count;
}
}
public void Clear()
{
OnClear();
InnerList.Clear();
OnClearComplete();
}
public void RemoveAt(int index)
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexMustBeLess);
object? temp = InnerList[index];
OnValidate(temp!);
OnRemove(index, temp);
InnerList.RemoveAt(index);
try
{
OnRemoveComplete(index, temp);
}
catch
{
InnerList.Insert(index, temp);
throw;
}
}
bool IList.IsReadOnly
{
get { return InnerList.IsReadOnly; }
}
bool IList.IsFixedSize
{
get { return InnerList.IsFixedSize; }
}
bool ICollection.IsSynchronized
{
get { return InnerList.IsSynchronized; }
}
object ICollection.SyncRoot
{
get { return InnerList.SyncRoot; }
}
void ICollection.CopyTo(Array array, int index)
{
InnerList.CopyTo(array, index);
}
object? IList.this[int index]
{
get
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexMustBeLess);
return InnerList[index];
}
set
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexMustBeLess);
OnValidate(value!);
object? temp = InnerList[index];
OnSet(index, temp, value);
InnerList[index] = value;
try
{
OnSetComplete(index, temp, value);
}
catch
{
InnerList[index] = temp;
throw;
}
}
}
bool IList.Contains(object? value)
{
return InnerList.Contains(value);
}
int IList.Add(object? value)
{
OnValidate(value!);
OnInsert(InnerList.Count, value);
int index = InnerList.Add(value);
try
{
OnInsertComplete(index, value);
}
catch
{
InnerList.RemoveAt(index);
throw;
}
return index;
}
void IList.Remove(object? value)
{
OnValidate(value!);
int index = InnerList.IndexOf(value);
if (index < 0) throw new ArgumentException(SR.Arg_RemoveArgNotFound);
OnRemove(index, value);
InnerList.RemoveAt(index);
try
{
OnRemoveComplete(index, value);
}
catch
{
InnerList.Insert(index, value);
throw;
}
}
int IList.IndexOf(object? value)
{
return InnerList.IndexOf(value);
}
void IList.Insert(int index, object? value)
{
if (index < 0 || index > Count)
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexMustBeLessOrEqual);
OnValidate(value!);
OnInsert(index, value);
InnerList.Insert(index, value);
try
{
OnInsertComplete(index, value);
}
catch
{
InnerList.RemoveAt(index);
throw;
}
}
public IEnumerator GetEnumerator()
{
return InnerList.GetEnumerator();
}
protected virtual void OnSet(int index, object? oldValue, object? newValue)
{
}
protected virtual void OnInsert(int index, object? value)
{
}
protected virtual void OnClear()
{
}
protected virtual void OnRemove(int index, object? value)
{
}
protected virtual void OnValidate(object value)
{
ArgumentNullException.ThrowIfNull(value);
}
protected virtual void OnSetComplete(int index, object? oldValue, object? newValue)
{
}
protected virtual void OnInsertComplete(int index, object? value)
{
}
protected virtual void OnClearComplete()
{
}
protected virtual void OnRemoveComplete(int index, object? value)
{
}
}
}