Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / DrawingCollection.cs / 1 / DrawingCollection.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: This file contains non-generated DrawingCollection // methods. // // History: // // 2005/03/18 : [....] - Created it. // //--------------------------------------------------------------------------- using System.Collections; using System.Collections.Generic; using System.Windows.Media.Animation; using System.Windows.Markup; namespace System.Windows.Media { ////// Collection of Drawing objects /// public sealed partial class DrawingCollection : Animatable, IList, IList{ /// /// Appends the entire input DrawingCollection, while only firing a single set of /// public events. If an exception is thrown from the public events, the /// Append operation is rolled back. /// internal void TransactionalAppend(DrawingCollection collectionToAppend) { // Use appendCount to avoid inconsistencies & runaway loops when // this == collectionToAppend, and to ensure collectionToAppend.Count // is only evaluated once. int appendCount = collectionToAppend.Count; // First, append the collection for(int i = 0; i < appendCount; i++) { AddWithoutFiringPublicEvents(collectionToAppend.Internal_GetItem(i)); } // Fire the public Changed event after all the elements have been added. // // If an exception is thrown, then the Append operation is rolled-back without // firing additional events. try { FireChanged(); } catch (Exception) { // Compute the number of elements that existed before the append int beforeAppendCount = Count - appendCount; // Remove the appended elements in reverse order without firing Changed events. for ( int i = Count - 1; // Start at the current last index i >= beforeAppendCount; // Until the previous last index i-- // Move to the preceding index ) { RemoveAtWithoutFiringPublicEvents(i); } // Avoid firing WritePostscript events (e.g., OnChanged) after rolling-back // the current operation. // // This ensures that only a single set of events is fired for both exceptional & // typical cases, and it's likely that firing events would cause another exception. throw; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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