Timer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / Timer.cs / 1305376 / 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.Web;
    using System.Web.Util; 
    using System.Web.Resources; 

    [ 
    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.
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Timer.cs source code in C# .NET

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