Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / MarshalByValueComponent.cs / 1 / MarshalByValueComponent.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.ComponentModel.Design; using System.Diagnostics.CodeAnalysis; using System.Security.Permissions; using System.Runtime.InteropServices; ////// [ ComVisible(true), Designer("System.Windows.Forms.Design.ComponentDocumentDesigner, " + AssemblyRef.SystemDesign, typeof(IRootDesigner)), DesignerCategory("Component"), TypeConverter(typeof(ComponentConverter)) ] public class MarshalByValueComponent : IComponent, IServiceProvider { ///Provides the base implementation for ///, /// which is the base class for all components in Win Forms. /// private static readonly object EventDisposed = new object(); private ISite site; private EventHandlerList events; ///Static hask key for the Disposed event. This field is read-only. ////// public MarshalByValueComponent() { } ~MarshalByValueComponent() { Dispose(false); } ///Initializes a new instance of the ///class. /// public event EventHandler Disposed { add { Events.AddHandler(EventDisposed, value); } remove { Events.RemoveHandler(EventDisposed, value); } } ///Adds a event handler to listen to the Disposed event on the component. ////// protected EventHandlerList Events { get { if (events == null) { events = new EventHandlerList(); } return events; } } ///Gets the list of event handlers that are attached to this component. ////// [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public virtual ISite Site { get { return site;} set { site = value;} } ///Gets or sets the site of the component. ////// [SuppressMessage("Microsoft.Usage", "CA2213:DisposableFieldsShouldBeDisposed")] public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } ///Disposes of the resources (other than memory) used by the component. ////// protected virtual void Dispose(bool disposing) { if (disposing) { lock(this) { if (site != null && site.Container != null) { site.Container.Remove(this); } if (events != null) { EventHandler handler = (EventHandler)events[EventDisposed]; if (handler != null) handler(this, EventArgs.Empty); } } } } ////// Disposes all the resources associated with this component. /// If disposing is false then you must never touch any other /// managed objects, as they may already be finalized. When /// in this state you should dispose any native resources /// that you have a reference to. /// ////// When disposing is true then you should dispose all data /// and objects you have references to. The normal implementation /// of this method would look something like: /// ////// public void Dispose() { /// Dispose(true); /// GC.SuppressFinalize(this); /// } /// /// protected virtual void Dispose(bool disposing) { /// if (disposing) { /// if (myobject != null) { /// myobject.Dispose(); /// myobject = null; /// } /// } /// if (myhandle != IntPtr.Zero) { /// NativeMethods.Release(myhandle); /// myhandle = IntPtr.Zero; /// } /// } /// /// ~MyClass() { /// Dispose(false); /// } ///
////// For base classes, you should never override the Finalier (~Class in C#) /// or the Dispose method that takes no arguments, rather you should /// always override the Dispose method that takes a bool. /// ////// protected override void Dispose(bool disposing) { /// if (disposing) { /// if (myobject != null) { /// myobject.Dispose(); /// myobject = null; /// } /// } /// if (myhandle != IntPtr.Zero) { /// NativeMethods.Release(myhandle); /// myhandle = IntPtr.Zero; /// } /// base.Dispose(disposing); /// } ///
////// [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public virtual IContainer Container { get { ISite s = site; return s == null ? null : s.Container; } } ///Gets the container for the component. ////// public virtual object GetService(Type service) { return((site==null)? null : site.GetService(service)); } ///Gets the implementer of the ///. /// [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public virtual bool DesignMode { get { ISite s = site; return(s == null) ? false : s.DesignMode; } } ///Gets a value indicating whether the component is currently in design mode. ////// /// public override String ToString() { ISite s = site; if (s != null) return s.Name + " [" + GetType().FullName + "]"; else return GetType().FullName; } } }/// Returns a ///containing the name of the , if any. This method should not be /// overridden. For /// internal use only. ///
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