ColumnCollection.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 / ColumnCollection.cs / 1 / ColumnCollection.cs
                        

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

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

    ///  
    ///    Represents the collection of columns to be displayed in 
    ///       a 
    ///       control. 
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class DataGridColumnCollection : ICollection, IStateManager {
 
        private DataGrid owner;
        private ArrayList columns; 
        private bool marked; 

 
        /// 
        /// Initializes a new instance of  class.
        /// 
        public DataGridColumnCollection(DataGrid owner, ArrayList columns) { 
            this.owner = owner;
            this.columns = columns; 
        } 

 
        /// 
        ///    Gets the number of columns in the collection. This property is read-only.
        /// 
        [ 
        Browsable(false)
        ] 
        public int Count { 
            get {
                return columns.Count; 
            }
        }

 
        /// 
        /// Gets a value that specifies whether items in the  can be 
        ///    modified. This property is read-only. 
        /// 
        [ 
        Browsable(false)
        ]
        public bool IsReadOnly {
            get { 
                return false;
            } 
        } 

 
        /// 
        /// Gets a value that indicates whether the  is thread-safe. This property is read-only.
        /// 
        [ 
        Browsable(false)
        ] 
        public bool IsSynchronized { 
            get {
                return false; 
            }
        }

 
        /// 
        ///    Gets the object used to synchronize access to the collection. This property is read-only.  
        ///  
        [
        Browsable(false) 
        ]
        public Object SyncRoot {
            get {
                return this; 
            }
        } 
 

        ///  
        /// Gets a  at the specified index in the
        ///    collection.
        /// 
        [ 
        Browsable(false)
        ] 
        public DataGridColumn this[int index] { 
            get {
                return (DataGridColumn)columns[index]; 
            }
        }

 

        ///  
        /// Appends a  to the collection. 
        /// 
        public void Add(DataGridColumn column) { 
            AddAt(-1, column);
        }

 
        /// 
        /// Inserts a  to the collection 
        ///    at the specified index. 
        /// 
        public void AddAt(int index, DataGridColumn column) { 
            if (column == null) {
                throw new ArgumentNullException("column");
            }
            if (index == -1) { 
                columns.Add(column);
            } 
            else { 
                columns.Insert(index, column);
            } 
            column.SetOwner(owner);
            if (marked)
                ((IStateManager)column).TrackViewState();
            OnColumnsChanged(); 
        }
 
 
        /// 
        /// Empties the collection of all  objects. 
        /// 
        public void Clear() {
            columns.Clear();
            OnColumnsChanged(); 
        }
 
 
        /// 
        /// Copies the contents of the entire collection into an  appending at 
        ///    the specified index of the .
        /// 
        public void CopyTo(Array array, int index) {
            if (array == null) { 
                throw new ArgumentNullException("array");
            } 
            for (IEnumerator e = this.GetEnumerator(); e.MoveNext();) 
                array.SetValue(e.Current, index++);
        } 


        /// 
        /// Creates an enumerator for the  used to iterate through the collection. 
        /// 
        public IEnumerator GetEnumerator() { 
            return columns.GetEnumerator(); 
        }
 


        /// 
        /// Returns the index of the first occurrence of a value in a . 
        /// 
        public int IndexOf(DataGridColumn column) { 
            if (column != null) { 
                return columns.IndexOf(column);
            } 
            return -1;
        }

 
        /// 
        ///  
        private void OnColumnsChanged() { 
            if (owner != null) {
                owner.OnColumnsChanged(); 
            }
        }

 
        /// 
        /// Removes a  from the collection at the specified 
        ///    index. 
        /// 
        public void RemoveAt(int index) { 
            if ((index >= 0) && (index < Count)) {
                columns.RemoveAt(index);
                OnColumnsChanged();
            } 
            else {
                throw new ArgumentOutOfRangeException("index"); 
            } 
        }
 

        /// 
        /// Removes the specified  from the collection.
        ///  
        public void Remove(DataGridColumn column) {
            int index = IndexOf(column); 
            if (index >= 0) { 
                RemoveAt(index);
            } 
        }


 
        /// 
        ///  
        /// Return true if tracking state changes. 
        /// 
        bool IStateManager.IsTrackingViewState { 
            get {
                return marked;
            }
        } 

 
        ///  
        /// 
        /// Load previously saved state. 
        /// 
        void IStateManager.LoadViewState(object savedState) {
            if (savedState != null) {
                object[] columnsState = (object[])savedState; 

                if (columnsState.Length == columns.Count) { 
                    for (int i = 0; i < columnsState.Length; i++) { 
                        if (columnsState[i] != null) {
                            ((IStateManager)columns[i]).LoadViewState(columnsState[i]); 
                        }
                    }
                }
            } 
        }
 
 
        /// 
        ///  
        /// Start tracking state changes.
        /// 
        void IStateManager.TrackViewState() {
            marked = true; 

            int columnCount = columns.Count; 
            for (int i = 0; i < columnCount; i++) { 
                ((IStateManager)columns[i]).TrackViewState();
            } 
        }


        ///  
        /// 
        /// Return object containing state changes. 
        ///  
        object IStateManager.SaveViewState() {
            int columnCount = columns.Count; 
            object[] columnsState = new object[columnCount];
            bool savedState = false;

            for (int i = 0; i < columnCount; i++) { 
                columnsState[i] = ((IStateManager)columns[i]).SaveViewState();
                if (columnsState[i] != null) 
                    savedState = true; 
            }
 
            return savedState ? columnsState : null;
        }
    }
}

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