ListItemCollection.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ListItemCollection.cs / 1 / ListItemCollection.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Drawing.Design;
    using System.Security.Permissions;
 

    ///  
    /// Encapsulates the items within a  . 
    ///    This class cannot be inherited.
    ///  
    [
    Editor("System.Web.UI.Design.WebControls.ListItemsCollectionEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor))
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public sealed class ListItemCollection : ICollection, IList, IStateManager {
 
        private ArrayList listItems; 
        private bool marked;
        private bool saveAll; 


        /// 
        ///    Initializes a new instance of the 
        ///  class.
        ///  
        public ListItemCollection() { 
            listItems = new ArrayList();
            marked = false; 
            saveAll = false;
        }

 
        /// 
        /// Gets a  referenced by the specified ordinal 
        ///    index value. 
        /// 
        public ListItem this[int index] { 
            get {
                return (ListItem)listItems[index];
            }
        } 

 
        ///  
        object IList.this[int index] {
            get { 
                return listItems[index];
            }
            set {
                listItems[index] = (ListItem)value; 
            }
        } 
 

        public int Capacity { 
            get {
                return listItems.Capacity;
            }
            set { 
                listItems.Capacity = value;
            } 
        } 

 
        /// 
        ///    Gets the item count of the collection.
        /// 
        public int Count { 
            get {
                return listItems.Count; 
            } 
        }
 

        /// 
        ///    Adds the specified item to the end of the collection.
        ///  
        public void Add(string item) {
            Add(new ListItem(item)); 
        } 

 
        /// 
        /// Adds the specified  to the end of the collection.
        /// 
        public void Add(ListItem item) { 
            listItems.Add(item);
            if (marked) { 
                item.Dirty = true; 
            }
        } 


        /// 
        int IList.Add(object item) { 
            ListItem newItem = (ListItem) item;
            int returnValue = listItems.Add(newItem); 
            if (marked) { 
                newItem.Dirty = true;
            } 
            return returnValue;
        }

 
        /// 
        ///  
        public void AddRange(ListItem[] items) { 
            if (items == null) {
                throw new ArgumentNullException("items"); 
            }
            foreach(ListItem item in items) {
                Add(item);
            } 
        }
 
 
        /// 
        /// Removes all  controls from the collection. 
        /// 
        public void Clear() {
            listItems.Clear();
            if (marked) 
                saveAll = true;
        } 
 

        ///  
        ///    Returns a value indicating whether the
        ///       collection contains the specified item.
        /// 
        public bool Contains(ListItem item) { 
            return listItems.Contains(item);
        } 
 

        ///  
        bool IList.Contains(object item) {
            return Contains((ListItem) item);
        }
 

        ///  
        /// Copies contents from the collection to a specified  with a 
        ///    specified starting index.
        ///  
        public void CopyTo(Array array, int index) {
            listItems.CopyTo(array,index);
        }
 

        public ListItem FindByText(string text) { 
            int index = FindByTextInternal(text, true); 
            if (index != -1) {
                return (ListItem)listItems[index]; 
            }
            return null;
        }
 
        internal int FindByTextInternal(string text, bool includeDisabled) {
            int i = 0; 
            foreach (ListItem item in listItems) { 
                if (item.Text.Equals(text) && (includeDisabled || item.Enabled)) {
                    return i; 
                }
                i++;
            }
            return -1; 
        }
 
        public ListItem FindByValue(string value) { 
            int index = FindByValueInternal(value, true);
            if (index != -1) { 
                return (ListItem)listItems[index];
            }
            return null;
        } 

        internal int FindByValueInternal(string value, bool includeDisabled) { 
            int i = 0; 
            foreach (ListItem item in listItems) {
                if (item.Value.Equals(value) && (includeDisabled || item.Enabled)) { 
                    return i;
                }
                i++;
            } 
            return -1;
        } 
 
        /// 
        /// Returns an enumerator of all  controls within the 
        ///    collection.
        /// 
        public IEnumerator GetEnumerator() {
            return listItems.GetEnumerator(); 
        }
 
 
        /// 
        ///    Returns an ordinal index value that represents the 
        ///       position of the specified  within the collection.
        /// 
        public int IndexOf(ListItem item) {
            return listItems.IndexOf(item); 
        }
 
 
        /// 
        int IList.IndexOf(object item) { 
            return IndexOf((ListItem) item);
        }

 
        /// 
        ///    Adds the specified item to the collection at the specified index 
        ///       location. 
        /// 
        public void Insert(int index,string item) { 
            Insert(index,new ListItem(item));
        }

 
        /// 
        /// Inserts the specified  to the collection at the specified 
        ///    index location. 
        /// 
        public void Insert(int index,ListItem item) { 
            listItems.Insert(index,item);
            if (marked)
                saveAll = true;
        } 

 
        ///  
        void IList.Insert(int index, object item) {
            Insert(index, (ListItem) item); 
        }


        ///  
        bool IList.IsFixedSize {
            get { 
                return false; 
            }
        } 


        /// 
        ///    Gets a value indicating whether the collection is read-only. 
        /// 
        public bool IsReadOnly { 
            get { return listItems.IsReadOnly; } 
        }
 

        /// 
        ///    Gets a value indicating whether access to the collection is synchronized
        ///       (thread-safe). 
        /// 
        public bool IsSynchronized { 
            get { return listItems.IsSynchronized; } 
        }
 

        /// 
        /// Removes the  from the collection at the specified
        ///    index location. 
        /// 
        public void RemoveAt(int index) { 
            listItems.RemoveAt(index); 
            if (marked)
                saveAll = true; 
        }


        ///  
        ///    Removes the specified item from the collection.
        ///  
        public void Remove(string item) { 
            int index = IndexOf(new ListItem(item));
            if (index >= 0) { 
                RemoveAt(index);
            }
        }
 

        ///  
        /// Removes the specified  from the collection. 
        /// 
        public void Remove(ListItem item) { 
            int index = IndexOf(item);
            if (index >= 0) {
                RemoveAt(index);
            } 
        }
 
 
        /// 
        void IList.Remove(object item) { 
            Remove((ListItem) item);
        }

 
        /// 
        ///    Gets the object that can be used to synchronize access to the collection. In 
        ///       this case, it is the collection itself. 
        /// 
        public object SyncRoot { 
            get { return this; }
        }

 
        /// 
        ///  
        /// Return true if tracking state changes. 
        /// Method of private interface, IStateManager.
        ///  
        bool IStateManager.IsTrackingViewState {
            get {
                return marked;
            } 
        }
 
 
        /// 
        void IStateManager.LoadViewState(object state) { 
            LoadViewState(state);
        }

        internal void LoadViewState(object state) { 
            if (state != null) {
                if (state is Pair) { 
                    // only changed items were saved 
                    Pair p = (Pair) state;
                    ArrayList indices = (ArrayList) p.First; 
                    ArrayList items = (ArrayList) p.Second;

                    for (int i=0; i 
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        }

        internal void TrackViewState() {
            marked = true; 
            for (int i=0; i < Count; i++)
                this[i].TrackViewState(); 
        } 

 
        /// 
        object IStateManager.SaveViewState() {
            return SaveViewState();
        } 

        internal object SaveViewState() { 
            if (saveAll == true) { 
                // save all items
                int count = Count; 
                object[] texts = new string[count];
                object[] values = new string[count];
                bool[] enableds = new bool[count];
                for (int i=0; i < count; i++) { 
                    texts[i] = this[i].Text;
                    values[i] =   this[i].Value; 
                    enableds[i] = this[i].Enabled; 
                }
                return new Triplet(texts, values, enableds); 
            }
            else {
                // save only the changed items
                ArrayList indices = new ArrayList(4); 
                ArrayList items = new ArrayList(4);
 
                for (int i=0; i < Count; i++) { 
                    object item = this[i].SaveViewState();
                    if (item != null) { 
                        indices.Add(i);
                        items.Add(item);
                    }
                } 
                if (indices.Count > 0)
                    return new Pair(indices, items); 
 
                return null;
            } 
        }

    }
}

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