ColumnCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / ColumnCollection.cs / 1305376 / 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;

    ///  
    ///    Represents the collection of columns to be displayed in
    ///       a  
    ///       control. 
    /// 
    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; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ColumnCollection.cs source code in C# .NET

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