ASP. NET (3)-built-in object (2)

In the previous blog, we have learned in detail the Request object, Response object, and Application object, the remaining four Session objects, Server objects, Cache objects, and Cookie objects will be introduced in this blog.

Iv. Session Object

Unlike the Application object acting on the entire Application life cycle, the Session object only refers to the time when the visitor arrives at a specific page and leaves. Each user obtains a Session separately. Two independent users cannot share information through the Session variable, which is one of the shortcomings of the Session. Another disadvantage is that one user has a Session. When the number of users is large, the pressure on the system is also extremely high.

Of course, although there are some deficiencies, the Session object is one of the essential knowledge of ASP. NET developers. It has two common functions: Creating and reading sessions.

1. Create a Session object:

<Script runat = "server"> void Page_Load (object sender, EventArgs e) {// set the session variable "user_name" value Session ["user_name"] = "sld "; // display the successful Session setting information Response. write ("Session" user_name "assigned value") ;}</script>

2.ReadSessionObject:

Response.Write("user_name="+Session ["user_name"].ToString ());

So far, let's summarize the advantages of the Session object:

Store user information

Tracking and monitoring user information in sessions

Destroy objects after the session expires

V. Server objects

You can use the Server object to obtain various information on the Server, for example:

<喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + signature + XO + signature/a94srNoaM8L3A + signature/M8L3A + signature + npdu6fm4bmp UN/Signature/ndctk/Signature + signature + LW2Li0z/ JXZWK3/logs/HIoc/gzazQxc + logs + downloads/downloads + downloads/O6zdKzw + bU2ldlYrf + zvHG97rN5K/logs + records + r/ j0tTA + Memory + 678 sbky/vQxc + rack/Rack + ioaM8L3A + rack + ICAgICAgICAgu + rack/Rack + rack/zo7o8L3A + rack "brush: java; "> <script runat =" server "> void Page_Load (object sender, EventArgs e) {// create an HttpCookie object instance MyCookie, the variable set is named user HttpCookie MyCookie = new HttpCookie ("user"); // value the variable user_name MyCookie ["user_name"] = "sld "; // set the Cookie expiration time to 365 days. expires = DateTime. today. addDays (365d); // Add Cookie Response. cookies. add (MyCookie); // display the Cookie creation success Response. write ("Cookie value already set");} </script>
2. Read Cookie objects:

Response.Write("user_name="+Request .Cookies ["user"]["user_name"]);

So far, seven built-in objects commonly used in ASP. NET are described separately, and their applications are learned through some simple examples. Of course, this is only the most basic knowledge. We need to continue to learn deeper application skills.