Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / HtmlControls / HtmlInputHidden.cs / 1 / HtmlInputHidden.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * HtmlInputHidden.cs * * Copyright (c) 2000 Microsoft Corporation */ namespace System.Web.UI.HtmlControls { using System.ComponentModel; using System; using System.Collections; using System.Collections.Specialized; using System.Web; using System.Web.UI; using System.Security.Permissions; ////// [ DefaultEvent("ServerChange"), SupportsEventValidation, ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class HtmlInputHidden : HtmlInputControl, IPostBackDataHandler { private static readonly object EventServerChange = new object(); /* * Creates an intrinsic Html INPUT type=hidden control. */ public HtmlInputHidden() : base("hidden") { } ////// The ///class defines the methods, properties, /// and events of the HtmlInputHidden control. This class allows programmatic access /// to the HTML <input type=hidden> element on the server. /// /// [ WebCategory("Action"), WebSysDescription(SR.HtmlInputHidden_OnServerChange) ] public event EventHandler ServerChange { add { Events.AddHandler(EventServerChange, value); } remove { Events.RemoveHandler(EventServerChange, value); } } /* * Method used to raise the OnServerChange event. */ ////// Occurs when the ///control /// is changed on the server. /// /// protected virtual void OnServerChange(EventArgs e) { EventHandler handler = (EventHandler)Events[EventServerChange]; if (handler != null) handler(this, e); } /* * */ ////// Raised on the server when the ///control /// changes between postback requests. /// /// /// protected internal override void OnPreRender(EventArgs e) { base.OnPreRender(e); // if no change handler, no need to save posted property if (!Disabled) { if (Events[EventServerChange] == null) { ViewState.SetItemDirty("value",false); } if (Page != null) { Page.RegisterEnabledControl(this); } } } /* * Method of IPostBackDataHandler interface to process posted data. * InputText process a newly posted value. */ ////// /// bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) { return LoadPostData(postDataKey, postCollection); } protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) { string current = Value; string text = postCollection.GetValues(postDataKey)[0]; if (!current.Equals(text)) { ValidateEvent(postDataKey); Value = text; return true; } return false; } protected override void RenderAttributes(HtmlTextWriter writer) { base.RenderAttributes(writer); if (Page != null) { Page.ClientScript.RegisterForEventValidation(RenderedNameAttribute); } } /* * Method of IPostBackDataHandler interface which is invoked whenever posted data * for a control has changed. TextBox fires an OnTextChanged event. */ ////// /// void IPostBackDataHandler.RaisePostDataChangedEvent() { RaisePostDataChangedEvent(); } ////// /// protected virtual void RaisePostDataChangedEvent() { OnServerChange(EventArgs.Empty); } } }
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