Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ExpressionBindingCollection.cs / 1 / ExpressionBindingCollection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.ComponentModel.Design; using System.Data; using System.Web.Util; using System.Security.Permissions; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class ExpressionBindingCollection : ICollection { private EventHandler changedEvent; private Hashtable bindings; private Hashtable removedBindings; ////// public ExpressionBindingCollection() { this.bindings = new Hashtable(StringComparer.OrdinalIgnoreCase); } ////// public int Count { get { return bindings.Count; } } ////// public bool IsReadOnly { get { return false; } } ////// public bool IsSynchronized { get { return false; } } ////// public ICollection RemovedBindings { get { int bindingCount = 0; ICollection keys = null; if (removedBindings != null) { keys = removedBindings.Keys; bindingCount = keys.Count; string[] removedNames = new string[bindingCount]; int i = 0; foreach (string s in keys) { removedNames[i++] = s; } removedBindings.Clear(); return removedNames; } else { return new string[0]; } } } ////// private Hashtable RemovedBindingsTable { get { if (removedBindings == null) { removedBindings = new Hashtable(StringComparer.OrdinalIgnoreCase); } return removedBindings; } } ////// public object SyncRoot { get { return this; } } ////// public ExpressionBinding this[string propertyName] { get { object o = bindings[propertyName]; if (o != null) return(ExpressionBinding)o; return null; } } public event EventHandler Changed { add { changedEvent = (EventHandler)Delegate.Combine(changedEvent, value); } remove { changedEvent = (EventHandler)Delegate.Remove(changedEvent, value); } } ////// public void Add(ExpressionBinding binding) { bindings[binding.PropertyName] = binding; RemovedBindingsTable.Remove(binding.PropertyName); OnChanged(); } ////// public bool Contains(string propName) { return bindings.Contains(propName); } ////// public void Clear() { ICollection keys = bindings.Keys; if ((keys.Count != 0) && (removedBindings == null)) { // ensure the removedBindings hashtable is created Hashtable h = RemovedBindingsTable; } foreach (string s in keys) { removedBindings[s] = String.Empty; } bindings.Clear(); OnChanged(); } ////// public void CopyTo(Array array, int index) { for (IEnumerator e = this.GetEnumerator(); e.MoveNext();) array.SetValue(e.Current, index++); } ////// public void CopyTo(ExpressionBinding[] array, int index) { for (IEnumerator e = this.GetEnumerator(); e.MoveNext();) array.SetValue(e.Current, index++); } ////// public IEnumerator GetEnumerator() { return bindings.Values.GetEnumerator(); } private void OnChanged() { if (changedEvent != null) { changedEvent(this, EventArgs.Empty); } } ////// public void Remove(string propertyName) { Remove(propertyName, true); } ////// public void Remove(ExpressionBinding binding) { Remove(binding.PropertyName, true); } ////// public void Remove(string propertyName, bool addToRemovedList) { if (Contains(propertyName)) { if (addToRemovedList && bindings.Contains(propertyName)) { RemovedBindingsTable[propertyName] = String.Empty; } bindings.Remove(propertyName); OnChanged(); } } } }
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