Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / Design / Serialization / DesignerLoader.cs / 1 / DesignerLoader.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel.Design.Serialization { using System; using System.Reflection; using System.Security.Permissions; ////// DesignerLoader. This class is responsible for loading a designer document. /// Where and how this load occurs is a private matter for the designer loader. /// The designer loader will be handed to an IDesignerHost instance. This instance, /// when it is ready to load the document, will call BeginLoad, passing an instance /// of IDesignerLoaderHost. The designer loader will load up the design surface /// using the host interface, and call EndLoad on the interface when it is done. /// The error collection passed into EndLoad should be empty or null to indicate a /// successful load, or it should contain a collection of exceptions that /// describe the error. /// /// Once a document is loaded, the designer loader is also responsible for /// writing any changes made to the document back whatever storage the /// loader used when loading the document. /// [HostProtection(SharedState = true)] [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name = "FullTrust")] [System.Runtime.InteropServices.ComVisible(true)] public abstract class DesignerLoader { ////// Returns true when the designer is in the process of loading. Clients that are /// sinking notifications from the designer often want to ignore them while the desingner is loading /// and only respond to them if they result from user interatcions. /// public virtual bool Loading { get { return false; } } ////// Called by the designer host to begin the loading process. The designer /// host passes in an instance of a designer loader host (which is typically /// the same object as the designer host. This loader host allows /// the designer loader to reload the design document and also allows /// the designer loader to indicate that it has finished loading the /// design document. /// public abstract void BeginLoad(IDesignerLoaderHost host); ////// Disposes this designer loader. The designer host will call this method /// when the design document itself is being destroyed. Once called, the /// designer loader will never be called again. /// public abstract void Dispose(); ////// The designer host will call this periodically when it wants to /// ensure that any changes that have been made to the document /// have been saved by the designer loader. This method allows /// designer loaders to implement a lazy-write scheme to improve /// performance. The default implementation does nothing. /// public virtual void Flush() {} } }
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