EmptyReadOnlyDictionaryInternal.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

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

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  ListDictionaryInternal 
**
** 
** Purpose: List for exceptions.
**
**
===========================================================*/ 

namespace System.Collections { 
    ///    This is a simple implementation of IDictionary that is empty and readonly. 
    [Serializable]
    internal sealed class EmptyReadOnlyDictionaryInternal: IDictionary { 

        // Note that this class must be agile with respect to AppDomains.  See its usage in
        // System.Exception to understand why this is the case.
 
        public EmptyReadOnlyDictionaryInternal() {
        } 
 
        // IEnumerable members
 
        IEnumerator IEnumerable.GetEnumerator() {
            return new NodeEnumerator();
        }
 
        // ICollection members
 
        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"); 

            // the actual copy is a NOP
        }
 
        public int Count {
            get { 
                return 0; 
            }
        } 

        public Object SyncRoot {
            get {
                return this; 
            }
        } 
 
        public bool IsSynchronized {
            get { 
                return false;
            }
        }
 
        // IDictionary members
 
        public Object this[Object key] { 
            get {
                if (key == null) { 
                    throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
                }
                return null;
            } 
            set {
                if (key == null) { 
                    throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key")); 
                }
 
                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");
 
                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ReadOnly")); 
            }
        } 

        public ICollection Keys {
            get {
                return new Object[0]; 
            }
        } 
 
        public ICollection Values {
            get { 
                return new Object[0];
            }
        }
 
        public bool Contains(Object key) {
            return false; 
        } 

        public void Add(Object key, Object value) { 
            if (key == null) {
                throw new ArgumentNullException("key", Environment.GetResourceString("ArgumentNull_Key"));
            }
 
            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"); 

            throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ReadOnly"));
        }
 
        public void Clear() {
            throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ReadOnly")); 
        } 

        public bool IsReadOnly { 
            get {
                return true;
            }
        } 

        public bool IsFixedSize { 
            get { 
                return true;
            } 
        }

        public IDictionaryEnumerator GetEnumerator() {
            return new NodeEnumerator(); 
        }
 
        public void Remove(Object key) { 
            throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ReadOnly"));
        } 

        private sealed class NodeEnumerator : IDictionaryEnumerator {

            public NodeEnumerator() { 
            }
 
            // IEnumerator members 

            public bool MoveNext() { 
                return false;
            }

            public Object Current { 
                get {
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen")); 
                } 
            }
 
            public void Reset() {
            }

            // IDictionaryEnumerator members 

            public Object Key { 
                get { 
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                } 
            }

            public Object Value {
                get { 
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                } 
            } 

            public DictionaryEntry Entry { 
                get {
                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EnumOpCantHappen"));
                }
            } 
        }
    } 
}
                        

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