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POHow does this Singleton-like web class persists session data, even though session is not updated in the property setters?
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  1. POHow does this Singleton-like web class persists session data, even though session is not updated in the property setters?
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    copied!<p>Ok, I've got this singleton-like web class which uses session to maintain state. I initially thought I was going to have to manipulate the session variables on each "set" so that the new values were updated in the session. However I tried using it as-is, and somehow, it remembers state.</p> <p>For example, if run this code on one page:</p> <pre><code>UserContext.Current.User.FirstName = "Micah"; </code></pre> <p>And run this code in a different browser tab, FirstName is displayed correctly:</p> <pre><code>Response.Write(UserContext.Current.User.FirstName); </code></pre> <p>Can someone tell me (prove) how this data is getting persisted in the session? Here is the class:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; public class UserContext { private UserContext() { } public static UserContext Current { get { if (System.Web.HttpContext.Current.Session["UserContext"] == null) { UserContext uc = new UserContext(); uc.User = new User(); System.Web.HttpContext.Current.Session["UserContext"] = uc; } return (UserContext)System.Web.HttpContext.Current.Session["UserContext"]; } } private string HospitalField; public string Hospital { get { return HospitalField; } set { HospitalField = value; ContractField = null; ModelType = null; } } private string ContractField; public string Contract { get { return ContractField; } set { ContractField = value; ModelType = string.Empty; } } private string ModelTypeField; public string ModelType { get { return ModelTypeField; } set { ModelTypeField = value; } } private User UserField; public User User { get { return UserField; } set { UserField = value; } } public void DoSomething() { } } public class User { public int UserId { get; set; } public string FirstName { get; set; } } </code></pre> <p>I added this to a watch, and can see that the session variable is definitely being set somewhere:</p> <pre><code>(UserContext)System.Web.HttpContext.Current.Session["UserContext"]; </code></pre> <p>As soon as a setter is called the Session var is immediately updated:</p> <pre><code> set { HospitalField = value; //&lt;--- here ContractField = null; ModelType = null; } </code></pre>
 

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