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This article is about how to implement page jump, debugging, form form, viewstate, cookie in ASP.NET. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1. Page jump:

(1 server transmission

Server.Transer (after the https://www.jb51.net); is directed to the new page, the original URL will still be displayed, the browser will not return to the original page, and the history will not be recorded.

Applies to complete control transfers, such as installation wizards.

(2 hyperlinks

(3 browser redirects Redirect, fast, not sent to server

(4 send PostBackUrl= "https://www.jb51.net" / > across pages

IsCrossPagePostBack is used to determine whether it is a cross-page submission.

IsPostBack is used to check whether the current web page is loaded for the first time. When the user visits the web page for the first time, Page.IsPostBack will return False, and return True after loading.

two。 Debug

(1 modify the Page instruction at the top of the .aspx page, add Trace= "true" and view it in the browser, (corresponding status code), and remember to change true back to false false commands after testing!

(2) insert trace log Trace.warn ("111") Trace.warn (" cATEGORY "," 111", excp)

The copy code is as follows:

Try {int a = 0; int b = 5 / a;}

Catch (System.Exception ex) {Trace.Warn ("zzl", "calling baked 5cyana", ex);}

The browser will be displayed in a bright red font:

(3 web.config application tracking trace

(4 breakpoint debugging

3. Form forms: get and post

Get passes values through url, and post does not display by hiding form values in http messages

Only when the data passed by get is limited, post can transmit a large amount of data.

However, post will have a browser prompt to resubmit the form, while get will not.

4. Disable viewstate: cannot read the value given to the client last time

Self-increasing: addTest.ashx

The copy code is as follows:

Public void ProcessRequest (HttpContext context) {

Context.Response.ContentType = "text/plain"

String ispostback = context.Request ["ispostBack"]

String value = "0"

If (ispostback = = "true") {

Value=context.Request ["num_01"]

Int valueInint = int.Parse (value)

ValueInint++

Value = valueInint.ToString ()

}

String filepath = context.Server.MapPath ("addTest.htm")

String content = System.IO.File.ReadAllText (filepath)

Content = content.Replace ("@ value", value)

Context.Response.Write (content)

}

Html

The copy code is as follows:

@ value

5 、 cookie

The server returns data in addition to general html data, there is also cookie, the browser will update the cookie value to the local browser, which may consume too many resources

Https://www.jb51.net so the image server of the website will be different from the domain name of the master station, reducing the transmission of cookie traffic to optimize the website speed: http://www.myblogs.com/daomul.gif

6. Each request will be processed by new an instance of class "variable 1" of a new IhttpHandler interface.

GC will be dropped after using it, and the last value will not be maintained.

Use static to "save" an instance that all visitors will access

The copy code is as follows:

Using System

Using System.Collections.Generic

Using System.Linq

Using System.Web

Using System.Web.UI

Using System.Web.UI.WebControls

Public partial class vivideo_test_ variable 1: System.Web.UI.Page

{

Private int i = 0

Private static int j = 0

Protected void Page_Load (object sender, EventArgs e)

{

}

Protected void Button1_Click (object sender, EventArgs e)

{

/ / iTunes +

/ / Label1.Text = i.ToString ()

Jacks +

Label1.Text = j.ToString ()

}

}

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