ASP.NET 12 - State Management

Chapter 12 Managing ASP.NET State Everything is in a state … Marcus Aurelius, Meditations , ix. 19

Overview ,[object Object],[object Object],[object Object],[object Object]

Why is state necessary? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASP.NET State Features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

View State ,[object Object],[object Object],ViewState["RequestCount"] = count; int count = (int)ViewState["RequestCount"];

View State ,[object Object],[object Object],[object Object],[object Object]

Serialization ,[object Object],[object Object],[object Object],[Serializable] public class Category { private int _num; private string _name; private Market _market; ... [Serializable] public class Market { ...

Uses of View State ,[object Object],[object Object],[object Object],[object Object],[object Object]

Misuses of View State ,[object Object],[object Object],[object Object],[object Object]

Query Strings ,[object Object],[object Object],[object Object],[object Object],http://www.whatever.com/file.aspx?page=resum%E9&name=John+Locke

Query Strings ,[object Object],[object Object],[object Object],[object Object]

Query Strings ,[object Object],[object Object],string url = "productPage.aspx?id=" + id; Response.Redirect(url); int id = Convert.ToInt32(Request["id“]); // use this id to construct SQL ... productPage.aspx

Cookies ,[object Object],[object Object],[object Object]

Cookies ,[object Object],[object Object]

Cookies HttpCookie cookie = new HttpCookie("Name",txtName.Text); // Set expiry date to 1 day, 12 hours from now cookie.Expires = DateTime.Now + new TimeSpan(1, 12, 0, 0); Response.Cookies.Add(cookie); HttpCookie cookie = Request.Cookies["name"]; labCookie.Text = cookie.Value;

Application State ,[object Object],[object Object],[object Object],Application["SiteRequestCount"] = 0; HttpContext.Current.Application["SiteName"] = "www.site.com"; … int count = (int)Application["SiteRequestCount"]; string name = (string)Application["SiteName"];

Application State ,[object Object]

Application State ,[object Object],[object Object],[object Object],[object Object],[object Object],if (Application["SiteRequestCount"] == null) { Application["SiteRequestCount"] = 0; // lazy initialization } int count = (int)Application["SiteRequestCount"]; count++; Application["SiteRequestCount"] = count; Application.Lock(); if (Application["SiteRequestCount"] == null) { Application["SiteRequestCount"] = 0; // lazy initialization } int count = (int)Application["SiteRequestCount"]; count++; Application["SiteRequestCount"] = count; Application.Unlock();

Application State ,[object Object],[object Object],<%@ Application Language="C#" %> <script runat="server"> void Application_Start(object sender, EventArgs e) { // Code that runs on application startup Application["SiteRequestCount"] = 0; Application["SiteName"] = "www.somesite.com"; } … </script>

Session State ,[object Object],[object Object],[object Object],[object Object],[object Object]

Session State ,[object Object],[object Object],[object Object]

Session State ,[object Object],[object Object],if (Session["Cart"] == null) { Session["Cart"] = new ShoppingCart(); } ShoppingCart cart = (ShoppingCart)Session["Cart"];

How Does Session State Work? ,[object Object],[object Object],[object Object],http://…/Ch11/(S(hlxh3ibe2htriazpxdne3b55))/Sample.aspx

How Does Session State Work? ,[object Object],[object Object],[object Object],[object Object]

State Providers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

In-Process Session Provider ,[object Object],[object Object],[object Object],[object Object]

Other Session Providers ,[object Object],[object Object],[object Object],[object Object]

Other Session Providers ,[object Object],[object Object]

State Server Session Provider ,[object Object],[object Object]

SQL Server Session Provider ,[object Object],[object Object],[object Object]

ASP.NET Cache ,[object Object],[object Object],[object Object]

Cache ,[object Object],[object Object]

Cache ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<%@ OutputCache Duration="60" VaryByParam="None" %> BookCatalogLogic bcl = new BookCatalogLogic(); publishers = bcl.GetAllPublishers(); Cache["PublisherKey"] = publishers;

ASP.NET 12 - State Management

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