Timer.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / Timer.cs / 1 / Timer.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI { 
    using System; 
    using System.Collections.Generic;
    using System.ComponentModel; 
    using System.Diagnostics.CodeAnalysis;
    using System.Drawing;
    using System.Globalization;
    using System.Reflection; 
    using System.Security.Permissions;
    using System.Web; 
    using System.Web.Util; 
    using System.Web.Resources;
 
    [
    AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal),
    DefaultEvent("Tick"), 
    DefaultProperty("Interval"),
    Designer("System.Web.UI.Design.TimerDesigner, " + AssemblyRef.SystemWebExtensionsDesign), 
    NonVisualControl, 
    ToolboxBitmap(typeof(EmbeddedResourceFinder), "System.Web.Resources.Timer.bmp"),
    SupportsEventValidation, 
    ]
    public class Timer : Control, IPostBackEventHandler, IScriptControl {
        private static readonly object TickEventKey = new object();
        private bool _stateDirty; 
        private new IPage _page;
        private ScriptManager _scriptManager; 
 
        public Timer() {}
 
        private IPage IPage {
            get {
                if (null == _page) {
                    Page page = Page; 
                    if (null == page) {
                        throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull); 
                    } 
                    _page = new PageWrapper(page);
                } 
                return _page;
            }
        }
 
        [
        ResourceDescription("Timer_TimerEnable"), 
        Category("Behavior"), 
        DefaultValue(true)
        ] 
        public bool Enabled {
            get {
                object o = ViewState["Enabled"];
                return (o != null) ? (bool)o : true; 
            }
            set { 
                if (!_stateDirty && IsTrackingViewState) { 
                    object o = ViewState["Enabled"];
                    _stateDirty = (null == o) ? true : (value != (bool)o); 
                }
                ViewState["Enabled"] = value;
            }
        } 

        [ 
        ResourceDescription("Timer_TimerInterval"), 
        Category("Behavior"),
        DefaultValue(60000) 
        ]
        public int Interval {
            get {
                object o = ViewState["Interval"]; 
                return (o != null) ? (int)o : 60000;
            } 
            set { 
                if (value <= 0) {
                    throw new ArgumentOutOfRangeException("value", AtlasWeb.Timer_IntervalMustBeGreaterThanZero); 
                }
                if (!_stateDirty && IsTrackingViewState) {
                    object o = ViewState["Interval"];
                    _stateDirty = (null == o) ? true : (value != (int)o); 
                }
                ViewState["Interval"] = value; 
            } 
        }
 
        internal ScriptManager ScriptManager {
            get {
                if (_scriptManager == null) {
                    Page page = Page; 
                    if (page == null) {
                        throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull); 
                    } 
                    _scriptManager = ScriptManager.GetCurrent(page);
                    if (_scriptManager == null) { 
                        throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.Common_ScriptManagerRequired, ID));
                    }
                }
                return _scriptManager; 
            }
        } 
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override bool Visible { 
            get {
                return base.Visible; 
            } 
            set {
                throw new NotImplementedException(); 
            }
        }

        [ 
        ResourceDescription("Timer_TimerTick"),
        Category("Action") 
        ] 
        public event EventHandler Tick {
            add { 
                Events.AddHandler(TickEventKey, value);
            }
            remove {
                Events.RemoveHandler(TickEventKey, value); 
            }
        } 
 
        private string GetJsonState() {
            return "[" + ((Enabled) ? "true" : "false") + "," + Interval.ToString(CultureInfo.InvariantCulture) + "]"; 
        }

        [SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate",
            Justification = "Matches IScriptControl interface.")] 
        protected virtual IEnumerable GetScriptDescriptors() {
            ScriptComponentDescriptor s = new ScriptControlDescriptor("Sys.UI._Timer", this.ClientID); 
            s.AddProperty("interval", Interval); 
            s.AddProperty("enabled", Enabled);
            s.AddProperty("uniqueID",this.UniqueID); 
            yield return s;
        }

        [SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate", 
            Justification = "Matches IScriptControl interface.")]
        protected virtual IEnumerable GetScriptReferences() { 
            yield return new ScriptReference("MicrosoftAjaxTimer.js", Assembly.GetAssembly(typeof(Timer)).FullName) ; 
        }
 
        #region IPostBackEventHandler Members
        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) {
            RaisePostBackEvent(eventArgument);
        } 
        #endregion
 
        #region IScriptControl Members 

        IEnumerable IScriptControl.GetScriptDescriptors() { 
            return GetScriptDescriptors();

        }
 
        IEnumerable IScriptControl.GetScriptReferences() {
            return GetScriptReferences(); 
        } 
        #endregion
 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);
 
            this.ScriptManager.RegisterScriptControl(this);
 
            if (_stateDirty && this.ScriptManager.IsInAsyncPostBack) { 
                _stateDirty = false;
                this.ScriptManager.RegisterDataItem(this, GetJsonState(), true); 
            }
            // Get a postback event reference to ensure that the postback script is generated
            // and to make sure this is an expected name/value pair from an event validation
            // perspective. 

            IPage.ClientScript.GetPostBackEventReference(new PostBackOptions(this, String.Empty)); 
        } 

        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        protected virtual void OnTick(EventArgs e) {
            EventHandler handler = (EventHandler)Events[TickEventKey];
            if (handler != null) {
                handler(this, e); 
            }
        } 
 
        [SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate",
            Justification = "Matches IPostBackEventHandler interface.")] 
        protected virtual void RaisePostBackEvent(string eventArgument) {
            if (Enabled) {
                OnTick(EventArgs.Empty);
            } 
        }
 
        protected internal override void Render(HtmlTextWriter writer) { 
            // Make sure we are in a form tag with runat=server.
            IPage.VerifyRenderingInServerForm(this); 

            writer.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
            writer.AddStyleAttribute(HtmlTextWriterStyle.Visibility, "hidden");
            writer.AddStyleAttribute(HtmlTextWriterStyle.Display, "none"); 
            writer.RenderBeginTag(HtmlTextWriterTag.Span);
            writer.RenderEndTag(); // Span 
 
            if (!DesignMode) {
                ScriptManager.RegisterScriptDescriptors(this); 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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