ChangeTrackingStringList
class ChangeTrackingStringList : IList<string>, ICollection<string>, IEnumerable<string>, IEnumerable
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
namespace System.ClientModel.Internal
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
internal class ChangeTrackingStringList : IList<string>, ICollection<string>, IEnumerable<string>, IEnumerable
{
private IList<string> _list;
private bool _frozen;
private bool _tracking = true;
public bool HasChanged { get; set; }
public string this[int index] {
get {
return _list[index];
}
set {
AssertNotFrozen();
_list[index] = value;
HasChanged |= _tracking;
}
}
public int Count => _list.Count;
public bool IsReadOnly => _list.IsReadOnly;
public ChangeTrackingStringList()
{
_list = new List<string>();
}
public ChangeTrackingStringList(IEnumerable<string> collection)
{
_list = new List<string>(collection);
}
public void Freeze()
{
_frozen = true;
}
public void AssertNotFrozen()
{
if (_frozen)
throw new InvalidOperationException("Cannot change any client pipeline options after the client pipeline has been created.");
}
public void Add(string item)
{
AssertNotFrozen();
_list.Add(item);
HasChanged |= _tracking;
}
public void Clear()
{
AssertNotFrozen();
int count = _list.Count;
_list.Clear();
HasChanged |= (_tracking && count != 0);
}
public bool Contains(string item)
{
return _list.Contains(item);
}
public void CopyTo(string[] array, int arrayIndex)
{
_list.CopyTo(array, arrayIndex);
}
public IEnumerator<string> GetEnumerator()
{
return _list.GetEnumerator();
}
public int IndexOf(string item)
{
return _list.IndexOf(item);
}
public void Insert(int index, string item)
{
AssertNotFrozen();
_list.Insert(index, item);
HasChanged |= _tracking;
}
public bool Remove(string item)
{
AssertNotFrozen();
bool flag = _list.Remove(item);
HasChanged |= (_tracking & flag);
return flag;
}
public void RemoveAt(int index)
{
AssertNotFrozen();
_list.RemoveAt(index);
HasChanged |= _tracking;
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
}