DataGridViewIntLinkedList.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewIntLinkedList.cs / 1 / DataGridViewIntLinkedList.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 
    using System;
    using System.Diagnostics; 
    using System.Collections;
    using System.Windows.Forms;
    using System.ComponentModel;
 
    /// 
    ///  
    /// Represents a linked list of integers 
    /// 
    internal class DataGridViewIntLinkedList : IEnumerable 
    {
        private DataGridViewIntLinkedListElement lastAccessedElement;
        private DataGridViewIntLinkedListElement headElement;
        private int count, lastAccessedIndex; 

        ///  
        IEnumerator IEnumerable.GetEnumerator() 
        {
            return new DataGridViewIntLinkedListEnumerator(this.headElement); 
        }

        /// 
        public DataGridViewIntLinkedList() 
        {
            lastAccessedIndex = -1; 
        } 

        ///  
        public DataGridViewIntLinkedList(DataGridViewIntLinkedList source)
        {
            Debug.Assert(source != null);
            int elements = source.Count; 
            for (int element = 0; element < elements; element++)
            { 
                Add(source[element]); 
            }
        } 

        /// 
        public int this[int index]
        { 
            get
            { 
                Debug.Assert(index >= 0); 
                Debug.Assert(index < this.count);
                if (this.lastAccessedIndex == -1 || index < this.lastAccessedIndex) 
                {
                    DataGridViewIntLinkedListElement tmp = this.headElement;
                    int tmpIndex = index;
                    while (tmpIndex > 0) 
                    {
                        tmp = tmp.Next; 
                        tmpIndex--; 
                    }
                    this.lastAccessedElement = tmp; 
                    this.lastAccessedIndex = index;
                    return tmp.Int;
                }
                else 
                {
                    while (this.lastAccessedIndex < index) 
                    { 
                        this.lastAccessedElement = this.lastAccessedElement.Next;
                        this.lastAccessedIndex++; 
                    }
                    return this.lastAccessedElement.Int;
                }
            } 
            set
            { 
                Debug.Assert(index >= 0); 
                if (index != this.lastAccessedIndex)
                { 
                    int currentInt = this[index];
                    Debug.Assert(index == this.lastAccessedIndex);
                }
                this.lastAccessedElement.Int = value; 
            }
        } 
 
        /// 
        public int Count 
        {
            get
            {
                return this.count; 
            }
        } 
 
        /// 
        public int HeadInt 
        {
            get
            {
                Debug.Assert(this.headElement != null); 
                return this.headElement.Int;
            } 
        } 

        ///  
        public void Add(int integer)
        {
            DataGridViewIntLinkedListElement newHead = new DataGridViewIntLinkedListElement(integer);
            if (this.headElement != null) 
            {
                newHead.Next = this.headElement; 
            } 
            this.headElement = newHead;
            this.count++; 
            this.lastAccessedElement = null;
            this.lastAccessedIndex = -1;
        }
 
        /// 
        public void Clear() 
        { 
            this.lastAccessedElement = null;
            this.lastAccessedIndex = -1; 
            this.headElement = null;
            this.count = 0;
        }
 
        /// 
        public bool Contains(int integer) 
        { 
            int index = 0;
            DataGridViewIntLinkedListElement tmp = this.headElement; 
            while (tmp != null)
            {
                if (tmp.Int == integer)
                { 
                    this.lastAccessedElement = tmp;
                    this.lastAccessedIndex = index; 
                    return true; 
                }
                tmp = tmp.Next; 
                index++;
            }
            return false;
        } 

        ///  
        public int IndexOf(int integer) 
        {
            if (Contains(integer)) 
            {
                return this.lastAccessedIndex;
            }
            else 
            {
                return -1; 
            } 
        }
 
        /// 
        public bool Remove(int integer)
        {
            DataGridViewIntLinkedListElement tmp1 = null, tmp2 = this.headElement; 
            while (tmp2 != null)
            { 
                if (tmp2.Int == integer) 
                {
                    break; 
                }
                tmp1 = tmp2;
                tmp2 = tmp2.Next;
            } 
            if (tmp2.Int == integer)
            { 
                DataGridViewIntLinkedListElement tmp3 = tmp2.Next; 
                if (tmp1 == null)
                { 
                    this.headElement = tmp3;
                }
                else
                { 
                    tmp1.Next = tmp3;
                } 
                this.count--; 
                this.lastAccessedElement = null;
                this.lastAccessedIndex = -1; 
                return true;
            }
            return false;
        } 

        ///  
        public void RemoveAt(int index) 
        {
            DataGridViewIntLinkedListElement tmp1 = null, tmp2 = this.headElement; 
            while (index > 0)
            {
                tmp1 = tmp2;
                tmp2 = tmp2.Next; 
                index--;
            } 
            DataGridViewIntLinkedListElement tmp3 = tmp2.Next; 
            if (tmp1 == null)
            { 
                this.headElement = tmp3;
            }
            else
            { 
                tmp1.Next = tmp3;
            } 
            this.count--; 
            this.lastAccessedElement = null;
            this.lastAccessedIndex = -1; 
        }
    }

    ///  
    /// 
    /// Represents an emunerator of elements in a   linked list. 
    ///  
    internal class DataGridViewIntLinkedListEnumerator : IEnumerator
    { 
        private DataGridViewIntLinkedListElement headElement;
        private DataGridViewIntLinkedListElement current;
        private bool reset;
 
        /// 
        public DataGridViewIntLinkedListEnumerator(DataGridViewIntLinkedListElement headElement) 
        { 
            this.headElement = headElement;
            this.reset = true; 
        }

        /// 
        object IEnumerator.Current 
        {
            get 
            { 
                Debug.Assert(this.current != null); // Since this is for internal use only.
                return this.current.Int; 
            }
        }

        ///  
        bool IEnumerator.MoveNext()
        { 
            if (this.reset) 
            {
                Debug.Assert(this.current == null); 
                this.current = this.headElement;
                this.reset = false;
            }
            else 
            {
                Debug.Assert(this.current != null); // Since this is for internal use only. 
                this.current = this.current.Next; 
            }
            return (this.current != null); 
        }

        /// 
        void IEnumerator.Reset() 
        {
            this.reset = true; 
            this.current = null; 
        }
    } 

    /// 
    /// 
    /// Represents an element in a  linked list. 
    /// 
    internal class DataGridViewIntLinkedListElement 
    { 
        private int integer;
        private DataGridViewIntLinkedListElement next; 

        /// 
        public DataGridViewIntLinkedListElement(int integer)
        { 
            this.integer = integer;
        } 
 
        /// 
        public int Int 
        {
            get
            {
                return this.integer; 
            }
            set 
            { 
                this.integer = value;
            } 
        }

        /// 
        public DataGridViewIntLinkedListElement Next 
        {
            get 
            { 
                return this.next;
            } 
            set
            {
                this.next = value;
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataGridViewIntLinkedList.cs source code in C# .NET

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