Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ControlCollection.cs / 1 / ControlCollection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System.Runtime.InteropServices; using System; using System.Collections; using System.Security.Permissions; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class ControlCollection : ICollection { private Control _owner; private Control[] _controls; private int _size; private int _version; private string _readOnlyErrorMsg = null; private int _defaultCapacity = 5; private int _growthFactor = 4; ////// The ///class provides a /// collection container that enables a control to maintain a /// list of its child controls. /// /// For performance reasons, this is internally strongly typed. Most implementation is copied from /// ArrayList.cs /// /// public ControlCollection(Control owner) { if (owner == null) { throw new ArgumentNullException("owner"); } _owner = owner; } internal ControlCollection(Control owner, int defaultCapacity, int growthFactor) { if (owner == null) { throw new ArgumentNullException("owner"); } _owner = owner; _defaultCapacity = defaultCapacity; _growthFactor = growthFactor; } /* * Adds a child control to this control. */ ///[To be supplied.] ////// public virtual void Add(Control child) { // Note: duplication of code with AddAt is deliberate for performance reasons. This is the more common form of the call. // Check arguments if (child == null) throw new ArgumentNullException("child"); if (_readOnlyErrorMsg != null) { throw new HttpException(SR.GetString(_readOnlyErrorMsg )); } // Make sure we have room if (_controls == null) { _controls = new Control[_defaultCapacity]; } else if (_size >= _controls.Length) { Control[] newArray = new Control[_controls.Length * _growthFactor ]; Array.Copy(_controls, newArray, _controls.Length); _controls = newArray; } // Add the control int index = _size; _controls[index] = child; _size++; _version++; // Notify Owner _owner.AddedControl(child, index); } /* * Adds a child control to this control at a certain index */ ///Adds the specified ///object /// to the collection. The new control is logically added to the end of an ordinal /// index array. /// public virtual void AddAt(int index, Control child) { // For compatability, we must support this. if (index == -1) { Add(child); return; } // Check Arguments if (child == null) { throw new ArgumentNullException("child"); } if (index < 0 || index > _size) { throw new ArgumentOutOfRangeException("index"); } if (_readOnlyErrorMsg != null) { throw new HttpException(SR.GetString(_readOnlyErrorMsg )); } // Make sure we have room if (_controls == null) { _controls = new Control[_defaultCapacity]; } else if (_size >= _controls.Length) { //expand Control[] newArray = new Control[_controls.Length * _growthFactor ]; //copy precedents Array.Copy(_controls, newArray, index); //insert newArray[index] = child; //copy antecedents Array.Copy(_controls, index, newArray, index+1, _size - index); _controls = newArray; } // Insert the control else if (index < _size) { Array.Copy(_controls, index, _controls, index + 1, _size - index); } _controls[index] = child; _size++; _version++; _owner.AddedControl(child, index); } ///Adds the specified ///object to the collection. The new control is added /// to the array at the specified index location. /// public virtual void Clear() { if (_controls != null) { // ASURT 123965: This used to call RemoveAt(0), which was an n^2 operation. Removing from the end of the array now. for (int i = _size - 1; i >= 0; i--) { RemoveAt(i); } if (_owner is INamingContainer) _owner.ClearNamingContainer(); } } ////// Removes all controls in the collection. /// ////// public virtual bool Contains(Control c) { if (_controls == null || c == null) return false; for (int i = 0; i < _size; i++) { if (Object.ReferenceEquals(c, _controls[i])) { return true; } } return false; } /* * Retrieves the number of child controls. */ ////// Indicates whether the collection contains a specific object /// ////// public virtual int Count { get { return _size; } } ////// Gets the number of child controls in the collection. /// ////// protected Control Owner { get { return _owner; } } ///[To be supplied.] ////// public virtual int IndexOf(Control value) { if (_controls == null) return -1; return Array.IndexOf(_controls, value, 0, _size); } ////// Returns the index of a specified ////// object /// in the collection. /// /// public virtual IEnumerator GetEnumerator() { return new ControlCollectionEnumerator(this); } ////// Returns an enumerator of all controls in the collection. /// ////// public virtual void CopyTo(Array array, int index) { if (_controls == null) return; if ((array != null) && (array.Rank != 1)) throw new HttpException(SR.GetString(SR.InvalidArgumentValue, "array")); Array.Copy(_controls, 0, array, index, _size); } ///Copies the specified child control to a location in the collection. ////// public Object SyncRoot { get { return this;} } ///Gets the parent control of the control collection. ////// public bool IsReadOnly { get { return (_readOnlyErrorMsg != null); } } // Setting an error message makes the control collection read only. If the user tries to modify // the collection, we look up the error message in the resources and throw an exception. // Set errorMsg to null to make the collection not read only. internal string SetCollectionReadOnly(string errorMsg) { string olderror = _readOnlyErrorMsg; _readOnlyErrorMsg = errorMsg; return olderror; } ///Gets a value indicating whether the collection is read-only. ////// public bool IsSynchronized { get { return false;} } ///Gets a value indicating whether the collection /// is synchronized. ////// virtual public Control this[int index] { get { if (index < 0 || index >= _size) { throw new ArgumentOutOfRangeException("index"); } return _controls[index]; } } ////// Gets a reference to an ordinal-indexed control in the collection. /// ////// public virtual void RemoveAt(int index) { if (_readOnlyErrorMsg != null) { throw new HttpException(SR.GetString(_readOnlyErrorMsg )); } Control child = this[index]; _size--; if (index < _size) { Array.Copy(_controls, index + 1, _controls, index, _size - index); } _controls[_size] = null; _version++; _owner.RemovedControl(child); } ////// Removes the specified child control from the collection. /// ////// public virtual void Remove(Control value) { int index = IndexOf(value); if (index >=0) RemoveAt(index); } // This is a copy of the ArrayListEnumeratorSimple in ArrayList.cs private class ControlCollectionEnumerator : IEnumerator { private ControlCollection list; private int index; private int version; private Control currentElement; internal ControlCollectionEnumerator(ControlCollection list) { this.list = list; this.index = -1; version = list._version; } public bool MoveNext() { if (index < (list.Count-1)) { if (version != list._version) { throw new InvalidOperationException(SR.GetString(SR.ListEnumVersionMismatch)); } index++; currentElement = list[index]; return true; } else index = list.Count; return false; } object IEnumerator.Current { get { return Current; } } public Control Current { get { if (index == -1) throw new InvalidOperationException(SR.GetString(SR.ListEnumCurrentOutOfRange)); if (index >= list.Count) throw new InvalidOperationException(SR.GetString(SR.ListEnumCurrentOutOfRange)); return currentElement; } } public void Reset() { if (version != list._version) throw new InvalidOperationException(SR.GetString(SR.ListEnumVersionMismatch)); currentElement = null; index = -1; } } } }/// Removes the specified /// child control object from the collection. /// ///
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