ListDictionaryInternal.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 / ListDictionaryInternal.cs / 1305376 / ListDictionaryInternal.cs
                        

                        
                            using System.Diagnostics.Contracts; 
// ==++==
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
/*============================================================ 
** 
** Class:  ListDictionaryInternal
** 
** [....]
**
**
** Purpose: List for exceptions. 
**
** 
===========================================================*/ 

namespace System.Collections { 
    ///    This is a simple implementation of IDictionary using a singly linked list. This
    ///    will be smaller and faster than a Hashtable if the number of elements is 10 or less.
    ///    This should not be used if performance is important for large numbers of elements.
    [Serializable] 
    internal class ListDictionaryInternal: IDictionary {
        DictionaryNode head; 
        int version; 
        int count;
        [NonSerialized] 
        private Object _syncRoot;

        public ListDictionaryInternal() {
        } 

        public Object this[Object key] { 
            get { 
                if (key == null) {
                    throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key")); 
                }
                Contract.EndContractBlock();
                DictionaryNode node = head;
 
                while (node != null) {
                    if ( node.key.Equals(key) ) { 
                        return node.value; 
                    }
                    node = node.next; 
                }
                return null;
            }
            set { 
                if (key == null) {
                    throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key")); 
                } 
                Contract.EndContractBlock();
 
#if FEATURE_SERIALIZATION
                if (!key.GetType().IsSerializable)
                    throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "key");
 
                if( (value != null) && (!value.GetType().IsSerializable ) )
                    throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "value"); 
#endif 

                version++; 
                DictionaryNode last = null;
                DictionaryNode node;
                for (node = head; node != null; node = node.next) {
                    if( node.key.Equals(key) ) { 
                        break;
                    } 
                    last = node; 
                }
                if (node != null) { 
                    // Found it
                    node.value = value;
                    return;
                } 
                // Not found, so add a new one
                DictionaryNode newNode = new DictionaryNode(); 
                newNode.key = key; 
                newNode.value = value;
                if (last != null) { 
                    last.next = newNode;
                }
                else {
                    head = newNode; 
                }
                count++; 
            } 
        }
 
        public int Count {
            get {
                return count;
            } 
        }
 
        public ICollection Keys { 
            get {
                return new NodeKeyValueCollection(this, true); 
            }
        }

        public bool IsReadOnly { 
            get {
                return false; 
            } 
        }
 
        public bool IsFixedSize {
            get {
                return false;
            } 
        }
 
        public bool IsSynchronized { 
            get {
                return false; 
            }
        }

        public Object SyncRoot { 
            get {
                if( _syncRoot == null) { 
                    System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); 
                }
                return _syncRoot; 
            }
        }

        public ICollection Values { 
            get {
                return new NodeKeyValueCollection(this, false); 
            } 
        }
 
        public void Add(Object key, Object value) {
            if (key == null) {
                throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
            } 
            Contract.EndContractBlock();
 
#if FEATURE_SERIALIZATION 
            if (!key.GetType().IsSerializable)
                throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "key" ); 

            if( (value != null) && (!value.GetType().IsSerializable) )
                throw new ArgumentException(Environment.GetResourceString("Argument_NotSerializable"), "value");
#endif 

            version++; 
            DictionaryNode last = null; 
            DictionaryNode node;
            for (node = head; node != null; node = node.next) { 
                if (node.key.Equals(key)) {
                    throw new ArgumentException(Environment.GetResourceString("Argument_AddingDuplicate__", node.key, key));
                }
                last = node; 
            }
            if (node != null) { 
                // Found it 
                node.value = value;
                return; 
            }
            // Not found, so add a new one
            DictionaryNode newNode = new DictionaryNode();
            newNode.key = key; 
            newNode.value = value;
            if (last != null) { 
                last.next = newNode; 
            }
            else { 
                head = newNode;
            }
            count++;
        } 

        public void Clear() { 
            count = 0; 
            head = null;
            version++; 
        }

        public bool Contains(Object key) {
            if (key == null) { 
                throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
            } 
            Contract.EndContractBlock(); 
            for (DictionaryNode node = head; node != null; node = node.next) {
                if (node.key.Equals(key)) { 
                    return true;
                }
            }
            return false; 
        }
 
        public void CopyTo(Array array, int index)  { 
            if (array==null)
                throw new ArgumentNullException("array"); 

            if (array.Rank != 1)
                throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported"));
 
            if (index < 0)
                    throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); 
 
            if ( array.Length - index < this.Count )
                throw new ArgumentException( Environment.GetResourceString("ArgumentOutOfRange_Index"), "index"); 
            Contract.EndContractBlock();

            for (DictionaryNode node = head; node != null; node = node.next) {
                array.SetValue(new DictionaryEntry(node.key, node.value), index); 
                index++;
            } 
        } 

        public IDictionaryEnumerator GetEnumerator() { 
            return new NodeEnumerator(this);
        }

        IEnumerator IEnumerable.GetEnumerator() { 
            return new NodeEnumerator(this);
        } 
 
        public void Remove(Object key) {
            if (key == null) { 
                throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
            }
            Contract.EndContractBlock();
            version++; 
            DictionaryNode last = null;
            DictionaryNode node; 
            for (node = head; node != null; node = node.next) { 
                if (node.key.Equals(key)) {
                    break; 
                }
                last = node;
            }
            if (node == null) { 
                return;
            } 
            if (node == head) { 
                head = node.next;
            } else { 
                last.next = node.next;
            }
            count--;
        } 

        private class NodeEnumerator : IDictionaryEnumerator { 
            ListDictionaryInternal list; 
            DictionaryNode current;
            int version; 
            bool start;


            public NodeEnumerator(ListDictionaryInternal list) { 
                this.list = list;
                version = list.version; 
                start = true; 
                current = null;
            } 

            public Object Current {
                get {
                    return Entry; 
                }
            } 
 
            public DictionaryEntry Entry {
                get { 
                    if (current == null) {
                        throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                    }
                    return new DictionaryEntry(current.key, current.value); 
                }
            } 
 
            public Object Key {
                get { 
                    if (current == null) {
                        throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                    }
                    return current.key; 
                }
            } 
 
            public Object Value {
                get { 
                    if (current == null) {
                        throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                    }
                    return current.value; 
                }
            } 
 
            public bool MoveNext() {
                if (version != list.version) { 
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                }
                if (start) {
                    current = list.head; 
                    start = false;
                } 
                else { 
                    if( current != null ) {
                        current = current.next; 
                    }
                }
                return (current != null);
            } 

            public void Reset() { 
                if (version != list.version) { 
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                } 
                start = true;
                current = null;
            }
 
        }
 
 
        private class NodeKeyValueCollection : ICollection {
            ListDictionaryInternal list; 
            bool isKeys;

            public NodeKeyValueCollection(ListDictionaryInternal list, bool isKeys) {
                this.list = list; 
                this.isKeys = isKeys;
            } 
 
            void ICollection.CopyTo(Array array, int index)  {
                if (array==null) 
                    throw new ArgumentNullException("array");
                if (array.Rank != 1)
                    throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported"));
                if (index < 0) 
                    throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
                Contract.EndContractBlock(); 
                if (array.Length - index < list.Count) 
                    throw new ArgumentException(Environment.GetResourceString("ArgumentOutOfRange_Index"), "index");
                for (DictionaryNode node = list.head; node != null; node = node.next) { 
                    array.SetValue(isKeys ? node.key : node.value, index);
                    index++;
                }
            } 

            int ICollection.Count { 
                get { 
                    int count = 0;
                    for (DictionaryNode node = list.head; node != null; node = node.next) { 
                        count++;
                    }
                    return count;
                } 
            }
 
            bool ICollection.IsSynchronized { 
                get {
                    return false; 
                }
            }

            Object ICollection.SyncRoot { 
                get {
                    return list.SyncRoot; 
                } 
            }
 
            IEnumerator IEnumerable.GetEnumerator() {
                return new NodeKeyValueEnumerator(list, isKeys);
            }
 

            private class NodeKeyValueEnumerator: IEnumerator { 
                ListDictionaryInternal list; 
                DictionaryNode current;
                int version; 
                bool isKeys;
                bool start;

                public NodeKeyValueEnumerator(ListDictionaryInternal list, bool isKeys) { 
                    this.list = list;
                    this.isKeys = isKeys; 
                    this.version = list.version; 
                    this.start = true;
                    this.current = null; 
                }

                public Object Current {
                    get { 
                        if (current == null) {
                            throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen")); 
                        } 
                        return isKeys ? current.key : current.value;
                    } 
                }

                public bool MoveNext() {
                    if (version != list.version) { 
                        throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                    } 
                    if (start) { 
                        current = list.head;
                        start = false; 
                    }
                    else {
                        if( current != null) {
                            current = current.next; 
                        }
                    } 
                    return (current != null); 
                }
 
                public void Reset() {
                    if (version != list.version) {
                        throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumFailedVersion"));
                    } 
                    start = true;
                    current = null; 
                } 
            }
        } 

        [Serializable]
        private class DictionaryNode {
            public Object key; 
            public Object value;
            public DictionaryNode next; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.


                        

                        

                        
                        
                    
                    

                        
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