Collection.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / ObjectModel / Collection.cs / 1 / Collection.cs
                        

                        
                            namespace System.Collections.ObjectModel 
{
    using System;
    using System.Collections;
    using System.Collections.Generic; 
    using System.Diagnostics;
 
    [Serializable()] 
    [System.Runtime.InteropServices.ComVisible(false)]
    [DebuggerTypeProxy(typeof(Mscorlib_CollectionDebugView<>))] 
    [DebuggerDisplay("Count = {Count}")]
    public class Collection: IList, IList
    {
        IList items; 
        [NonSerialized]
        private Object _syncRoot; 
 
        public Collection() {
            items = new List(); 
        }

        public Collection(IList list) {
            if (list == null) { 
                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.list);
            } 
            items = list; 
        }
 
        public int Count {
            get { return items.Count; }
        }
 
        protected IList Items {
            get { return items; } 
        } 

        public T this[int index] { 
            get { return items[index]; }
            set {
                if( items.IsReadOnly) {
                    ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); 
                }
 
                if (index < 0 || index >= items.Count) { 
                    ThrowHelper.ThrowArgumentOutOfRangeException();
                } 

                SetItem(index, value);
            }
        } 

        public void Add(T item) { 
            if( items.IsReadOnly) { 
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            } 

            int index = items.Count;
            InsertItem(index, item);
        } 

        public void Clear() { 
            if( items.IsReadOnly) { 
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            } 

            ClearItems();
        }
 
        public void CopyTo(T[] array, int index) {
            items.CopyTo(array, index); 
        } 

        public bool Contains(T item) { 
            return items.Contains(item);
        }

        public IEnumerator GetEnumerator() { 
            return items.GetEnumerator();
        } 
 
        public int IndexOf(T item) {
            return items.IndexOf(item); 
        }

        public void Insert(int index, T item) {
            if (index < 0 || index > items.Count) { 
                ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_ListInsert);
            } 
 
            InsertItem(index, item);
        } 

        public bool Remove(T item) {
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); 
            }
 
            int index = items.IndexOf(item); 
            if (index < 0) return false;
            RemoveItem(index); 
            return true;
        }

        public void RemoveAt(int index) { 
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection); 
            } 

            if (index < 0 || index >= items.Count) { 
                ThrowHelper.ThrowArgumentOutOfRangeException();
            }

            RemoveItem(index); 
        }
 
        protected virtual void ClearItems() { 
            items.Clear();
        } 

        protected virtual void InsertItem(int index, T item) {
            items.Insert(index, item);
        } 

        protected virtual void RemoveItem(int index) { 
            items.RemoveAt(index); 
        }
 
        protected virtual void SetItem(int index, T item) {
            items[index] = item;
        }
 
        bool ICollection.IsReadOnly {
            get { 
                return items.IsReadOnly; 
            }
        } 
 		
        IEnumerator IEnumerable.GetEnumerator() {
            return ((IEnumerable)items).GetEnumerator();
        } 

        bool ICollection.IsSynchronized { 
            get { return false; } 
        }
 
        object ICollection.SyncRoot {
            get {
                if( _syncRoot == null) {
                    ICollection c = items as ICollection; 
                    if( c != null) {
                        _syncRoot = c.SyncRoot; 
                    } 
                    else {
                        System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); 
                    }
                }
                return _syncRoot;
            } 
        }
 
        void ICollection.CopyTo(Array array, int index) { 
            if (array == null) {
                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array); 
            }

            if (array.Rank != 1) {
                ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_RankMultiDimNotSupported); 
            }
 
            if( array.GetLowerBound(0) != 0 ) { 
                ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_NonZeroLowerBound);
            } 

            if (index < 0 ) {
                ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
            } 

            if (array.Length - index < Count) { 
                ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall); 
            }
 
            T[] tArray = array as T[];
            if (tArray  != null) {
                items.CopyTo(tArray , index);
            } 
            else {
                // 
                // Catch the obvious case assignment will fail. 
                // We can found all possible problems by doing the check though.
                // For example, if the element type of the Array is derived from T, 
                // we can't figure out if we can successfully copy the element beforehand.
                //
                Type targetType = array.GetType().GetElementType();
                Type sourceType = typeof(T); 
                if(!(targetType.IsAssignableFrom(sourceType) || sourceType.IsAssignableFrom(targetType))) {
                    ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType); 
                } 

                // 
                // We can't cast array of value type to object[], so we don't support
                // widening of primitive types here.
                //
                object[] objects = array as object[]; 
                if( objects == null) {
                    ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType); 
                } 

                int count = items.Count; 
                try {
                    for (int i = 0; i < count; i++) {
                        objects[index++] = items[i];
                    } 
                }
                catch(ArrayTypeMismatchException) { 
                    ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArrayType); 
                }
            } 
        }

        object IList.this[int index] {
            get { return items[index]; } 
            set {
                VerifyValueType(value); 
                this[index] = (T)value; 
            }
        } 

        bool IList.IsReadOnly {
            get {
                return items.IsReadOnly; 
            }
        } 
 
        bool IList.IsFixedSize {
            get { 
                // There is no IList.IsFixedSize, so we must assume false if our
                // internal item collection does not implement IList
                IList list = items as IList;
                if(list != null) 
                {
                    return list.IsFixedSize; 
                } 
                return false;
            } 
        }

        int IList.Add(object value) {
            if( items.IsReadOnly) { 
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            } 
 
            VerifyValueType(value);
            Add((T)value); 
            return this.Count - 1;
        }

        bool IList.Contains(object value) { 
            if(IsCompatibleObject(value)) {
                return Contains((T)value); 
            } 
            return false;
        } 

        int IList.IndexOf(object value) {
            if(IsCompatibleObject(value)) {
                return IndexOf((T)value); 
            }
            return -1; 
        } 

        void IList.Insert(int index, object value) { 
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            }
 
            VerifyValueType(value);
            Insert(index, (T)value); 
        } 

        void IList.Remove(object value) { 
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            }
 
            if(IsCompatibleObject(value)) {
                Remove((T)value); 
            } 
        }
 
        private static bool IsCompatibleObject(object value) {
            if( (value is T) || ( value == null && !typeof(T).IsValueType) ) {
                return true;
            } 
            return false;
        } 
 
        private static void VerifyValueType(object value) {
            if( !IsCompatibleObject(value)) { 
                ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(T));
            }
        }
    } 
}

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