c#-webform-★ Introduction to Built-in objects ★request-Get Request object, response corresponding Request object, session global variable (private), cookie global variable (private), application global public variable, ViewState

Built-in objects:

1. Request-Gets the requested object

Usage: Receive pass-through value

protected void Page_Load (object  sender, EventArgs e)    {        = request["ABC"];    } 

2. Response-Corresponding Request object

Usage:(Lee brainstorming Lxc)

1. Execute code

// Click the button to execute the code    void Button1_Click (object  sender, EventArgs e)    {        Response.Write ("<script> Alert (' Hello 2017! ');</script>");    }

2. Print text at the top of the page

// Click the button to print the text    void Button1_Click (object  sender, EventArgs e)    {        Response.Write ("  Today is the first day of 2017! ");    }

3, jump page and pass value (Li brainstorming lxc)

// Click on the button to jump page    void Button1_Click (object  sender, EventArgs e)    {        Response.Redirect ("  default.aspx?abc= Hello 2017! ");    }

3, Session-Server global variable group-each user access is private, independent of each other

Storage location: Service side

Life cycle: 20 minutes

Usage: Pass Value

Web1 Assignment WEB2 Value

// button click event    void Button1_Click (object  sender, EventArgs e)    {        string s = TextBox1.Text;        session["un"] = s;    }

if (session["un"null)        {            = session["un" ]. ToString ();        }

4, Cookie-Client global variable group-each user access is private, independent of each other

Storage location: Client (Lee brainstorming LXC)

Life cycle: Session cookie 20-minute persistent Cookie Unlimited

Cookie Life cycle Settings:

//button click event    voidButton1_Click (Objectsender, EventArgs e) {        strings =TextBox1.Text; if(s = ="ADIMN"&& TextBox2.Text = ="1234") {response.cookies["un"]. Value =s; //set [Persistent cookie] time when selected            if(checkbox1.checked) {response.cookies["un"]. Expires = DateTime.Now.AddDays (3); } Response.Redirect ("default2.aspx"); }    }

Usage: Web1 Assignment web2 value

 //  button click event   void  button1_click (object   sender,         EventArgs e) { string  s = TextBox1.Text; response.cookies[  " un   "].    Value = S; }

if (request.cookies["un"]!=null)        {            = request.cookies["un"]. Value;        }

5, application-Global public variable group-all Access users are the same variable that is accessed, such as information presented to all users

Available for server caching

Storage location: Service side (Lee brainstorming Lxc)

usage: Pass Value

Web1 Assignment WEB2 Value

 //  button click event   void  button1_click (object   sender,         EventArgs e) { string  s = TextBox1.Text; application[  " un  " ] = S; }

if (application["un"null)        {            = application["un "]. ToString ();        }

6, ViewState-because of the non-state of the HTML, it will not know what your previous page is state, ViewState function is to record the status of the previous page, similar to "case", record information

c#-webform-★ Introduction to Built-in objects ★request-Get Request object, response corresponding Request object, session global variable (private), cookie global variable (private), application global public variable, ViewState