Collection.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / ObjectModel / Collection.cs / 1305376 / Collection.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
namespace System.Collections.ObjectModel
{ 
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Diagnostics; 
    using System.Runtime;
 
    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(false)]
    [DebuggerTypeProxy(typeof(Mscorlib_CollectionDebugView<>))] 
    [DebuggerDisplay("Count = {Count}")]
    public class Collection: IList, IList
    {
        IList items; 
        [NonSerialized]
        private Object _syncRoot; 
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public Collection() {
            items = new List();
        } 

        public Collection(IList list) { 
            if (list == null) { 
                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.list);
            } 
            items = list;
        }

        public int Count { 
#if !FEATURE_CORECLR
            [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif 
            get { return items.Count; }
        } 

        protected IList Items {
            get { return items; }
        } 

        public T this[int index] { 
#if !FEATURE_CORECLR 
            [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif 
            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);
        } 

#if !FEATURE_CORECLR 
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public void Clear() { 
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            }
 
            ClearItems();
        } 
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public void CopyTo(T[] array, int index) {
            items.CopyTo(array, index);
        } 

#if !FEATURE_CORECLR 
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public bool Contains(T item) { 
            return items.Contains(item);
        }

        public IEnumerator GetEnumerator() { 
            return items.GetEnumerator();
        } 
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public int IndexOf(T item) {
            return items.IndexOf(item);
        } 

        public void Insert(int index, T item) { 
            if (items.IsReadOnly) { 
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            } 

            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);
        }
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif 
        protected virtual void ClearItems() {
            items.Clear(); 
        }

#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        protected virtual void InsertItem(int index, T item) { 
            items.Insert(index, item); 
        }
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif
        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 {
                ThrowHelper.IfNullAndNullsAreIllegalThenThrow(value, ExceptionArgument.value); 

                try { 
                    this[index] = (T)value; 
                }
                catch (InvalidCastException) { 
                    ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(T));
                }

            } 
        }
 
        bool IList.IsReadOnly { 
            get {
                return items.IsReadOnly; 
            }
        }

        bool IList.IsFixedSize { 
            get {
                // There is no IList.IsFixedSize, so we must assume that only 
                // readonly collections are fixed size, if our internal item 
                // collection does not implement IList.  Note that Array implements
                // IList, and therefore T[] and U[] will be fixed-size. 
                IList list = items as IList;
                if(list != null)
                {
                    return list.IsFixedSize; 
                }
                return items.IsReadOnly; 
            } 
        }
 
        int IList.Add(object value) {
            if( items.IsReadOnly) {
                ThrowHelper.ThrowNotSupportedException(ExceptionResource.NotSupported_ReadOnlyCollection);
            } 
            ThrowHelper.IfNullAndNullsAreIllegalThenThrow(value, ExceptionArgument.value);
 
            try { 
                Add((T)value);
            } 
            catch (InvalidCastException) {
                ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(T));
            }
 
            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); 
            } 
            ThrowHelper.IfNullAndNullsAreIllegalThenThrow(value, ExceptionArgument.value);
 
            try {
                Insert(index, (T)value);
            }
            catch (InvalidCastException) { 
                ThrowHelper.ThrowWrongValueTypeArgumentException(value, typeof(T));
            } 
 
        }
 
        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) {
            // Non-null values are fine.  Only accept nulls if T is a class or Nullable.
            // Note that default(T) is not equal to null for value types except when T is Nullable. 
            return ((value is T) || (value == null && default(T) == null));
        } 
    } 
}

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

                        

                        
                        
                    
                    

                        
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