ThreadSafeList.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Common / Utils / ThreadSafeList.cs / 1 / ThreadSafeList.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Threading;
namespace System.Data.Common.Utils
{
 
    internal sealed class ThreadSafeList : IList
    { 
        private readonly ReaderWriterLockSlim _lock; 
        private List _list;
 
        internal ThreadSafeList()
        {
            _list = new List();
            _lock = new ReaderWriterLockSlim(); 
        }
 
        public int Count 
        {
            get 
            {
                _lock.EnterReadLock();
                int count;
                try 
                {
                     count = _list.Count; 
                } 
                finally
                { 
                    _lock.ExitReadLock();
                }

                return count; 
            }
        } 
 
        public void Add(T item)
        { 
            _lock.EnterWriteLock();
            try
            {
                _list.Add(item); 
            }
            finally 
            { 
                _lock.ExitWriteLock();
            } 
        }

        public T this[int index]
        { 
            get
            { 
                _lock.EnterReadLock(); 
                T result;
                try 
                {
                    result = _list[index];
                }
                finally 
                {
                    _lock.ExitReadLock(); 
                } 
                return result;
            } 
            set
            {
                _lock.EnterWriteLock();
                try 
                {
                    _list[index] = value; 
                } 
                finally
                { 
                    _lock.ExitWriteLock();
                }
            }
        } 

        public bool IsReadOnly 
        { 
            get
            { 
                return false;
            }
        }
 
        public int IndexOf(T item)
        { 
            _lock.EnterReadLock(); 
            int result;
            try 
            {
                result = _list.IndexOf(item);
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
            return result;
        } 

        public void Insert(int index, T item)
        {
            _lock.EnterWriteLock(); 
            try
            { 
                _list.Insert(index, item); 
            }
            finally 
            {
                _lock.ExitWriteLock();
            }
        } 

        public void RemoveAt(int index) 
        { 
            _lock.EnterWriteLock();
            try 
            {
                _list.RemoveAt(index);
            }
            finally 
            {
                _lock.ExitWriteLock(); 
            } 
        }
 
        public void Clear()
        {
            _lock.EnterWriteLock();
            try 
            {
                _list.Clear(); 
            } 
            finally
            { 
                _lock.ExitWriteLock();
            }
        }
 
        public bool Contains(T item)
        { 
            _lock.EnterReadLock(); 
            bool result;
            try 
            {
                result = _list.Contains(item);
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
            return result;
        } 

        public void CopyTo(T[] array, int arrayIndex)
        {
            _lock.EnterWriteLock(); 
            try
            { 
                _list.CopyTo(array, arrayIndex); 
            }
            finally 
            {
                _lock.ExitWriteLock();
            }
        } 

        public bool Remove(T item) 
        { 
            _lock.EnterWriteLock();
            bool result; 
            try
            {
                result = _list.Remove(item);
            } 
            finally
            { 
                _lock.ExitWriteLock(); 
            }
            return result; 
        }

        public IEnumerator GetEnumerator()
        { 
            _lock.EnterReadLock();
            try 
            { 
                foreach (T value in _list)
                { 
                    yield return value;
                }
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
        }
 
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        } 
    }
 
 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Threading;
namespace System.Data.Common.Utils
{
 
    internal sealed class ThreadSafeList : IList
    { 
        private readonly ReaderWriterLockSlim _lock; 
        private List _list;
 
        internal ThreadSafeList()
        {
            _list = new List();
            _lock = new ReaderWriterLockSlim(); 
        }
 
        public int Count 
        {
            get 
            {
                _lock.EnterReadLock();
                int count;
                try 
                {
                     count = _list.Count; 
                } 
                finally
                { 
                    _lock.ExitReadLock();
                }

                return count; 
            }
        } 
 
        public void Add(T item)
        { 
            _lock.EnterWriteLock();
            try
            {
                _list.Add(item); 
            }
            finally 
            { 
                _lock.ExitWriteLock();
            } 
        }

        public T this[int index]
        { 
            get
            { 
                _lock.EnterReadLock(); 
                T result;
                try 
                {
                    result = _list[index];
                }
                finally 
                {
                    _lock.ExitReadLock(); 
                } 
                return result;
            } 
            set
            {
                _lock.EnterWriteLock();
                try 
                {
                    _list[index] = value; 
                } 
                finally
                { 
                    _lock.ExitWriteLock();
                }
            }
        } 

        public bool IsReadOnly 
        { 
            get
            { 
                return false;
            }
        }
 
        public int IndexOf(T item)
        { 
            _lock.EnterReadLock(); 
            int result;
            try 
            {
                result = _list.IndexOf(item);
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
            return result;
        } 

        public void Insert(int index, T item)
        {
            _lock.EnterWriteLock(); 
            try
            { 
                _list.Insert(index, item); 
            }
            finally 
            {
                _lock.ExitWriteLock();
            }
        } 

        public void RemoveAt(int index) 
        { 
            _lock.EnterWriteLock();
            try 
            {
                _list.RemoveAt(index);
            }
            finally 
            {
                _lock.ExitWriteLock(); 
            } 
        }
 
        public void Clear()
        {
            _lock.EnterWriteLock();
            try 
            {
                _list.Clear(); 
            } 
            finally
            { 
                _lock.ExitWriteLock();
            }
        }
 
        public bool Contains(T item)
        { 
            _lock.EnterReadLock(); 
            bool result;
            try 
            {
                result = _list.Contains(item);
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
            return result;
        } 

        public void CopyTo(T[] array, int arrayIndex)
        {
            _lock.EnterWriteLock(); 
            try
            { 
                _list.CopyTo(array, arrayIndex); 
            }
            finally 
            {
                _lock.ExitWriteLock();
            }
        } 

        public bool Remove(T item) 
        { 
            _lock.EnterWriteLock();
            bool result; 
            try
            {
                result = _list.Remove(item);
            } 
            finally
            { 
                _lock.ExitWriteLock(); 
            }
            return result; 
        }

        public IEnumerator GetEnumerator()
        { 
            _lock.EnterReadLock();
            try 
            { 
                foreach (T value in _list)
                { 
                    yield return value;
                }
            }
            finally 
            {
                _lock.ExitReadLock(); 
            } 
        }
 
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        } 
    }
 
 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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