Asp. NET Global Application Classes

Asp. NET Global Application Classes from the old man's blog http://shijiaqi1066.iteye.com/blog/1728603 This is saved to your blog inside to learn to see later

Global file

New Global file

Visual Studio Add New Item--"Web"--"Global Application Class"

produces the global class.

A webapplication can have only one global application class. If the new discovery does not have a global application class, it means that the class already exists, and if you need to create a new, delete the old ones before creating them.

Global class:

C # code

2. Using System;
4. Using System.Collections.Generic;
6. Using System.Linq;
8. Using System.Web;
10. Using System.Web.Security;
12. Using System.Web.SessionState;
16. Namespace WebApplication1
18. {
20. public class Global:System.Web.HttpApplication
22. {
26. protected void Application_Start (object sender, EventArgs e)
28. {
30. //code that runs when the application starts.
32. //The method is executed the first time the program obtains the request.
36. }
40. protected void session_start (object sender, EventArgs e)
42. {
44. //code that runs when a new session is started.
46. //The method is called, indicating that there is currently a new session generated.
48. }
52. protected void Application_BeginRequest (object sender, EventArgs e)
54. {
56. //code that is allowed when a new request is started.
58. //Each request triggers the method.
60. }
64. protected void Application_AuthenticateRequest (object sender, EventArgs e)
66. {
68. //code that runs when the application starts.
70. //The method is executed the first time the program obtains the request.
72. }
76. protected void Application_Error (object sender, EventArgs e)
78. {
80. //code that runs when an unhandled error occurs
82. //Get exception information and process: HttpContext.Current.Server.GetLastError ();
84. }
88. protected void Session_End (object sender, EventArgs e)
90. {
92. //code that runs at the end of the session.
94. //Note: The Session_End event is raised only if the sessionstate mode in the Web. config file is set to InProc.
96. //If the session mode is set to StateServer or SQL Server, the event is not raised.
98. }
102. protected void Application_End (object sender, EventArgs e)
104. {
106. //code to run when the application shuts down
108. }
110. }
112. }

Application:

Session_Start () Method: Count the number of people online.

Application_BeginRequest () Method: Block IP, prevent hotlinking. Yes, so the picture is watermark.

Application_AuthenticateRequest () Method: Validation method.

Application_Error () Method:

Add:

1. Get the current request URL:HTTPCONTEXT.CURRENT.REQUEST.URL

2. Manual Logoff Session:HttpContext.Current.Session.Abandon ()

3. Add text information to the file and create it first if the file does not exist: File.appendalltext ("C:1.txt", DateTime.Now.ToString ())

4. Ip:HttpContext.Current.Request.UserHostAddress of requests for access to the website;

5. Print output to the page: HttpContext.Current.Request.Write ("has been blocked! ");

6. Print output end to call: HttpContext.Current.Request.End ();

7. Get Request Type: HttpContext.Current.Request.ContentType

8. Get URL information for client last request: HttpContext.Current.Request.UrlReferrer; (Description: This property is an instance of the URI class.) ）

9. Gets the domain name of the URI object: URI. Host;

(Gets the domain name of the URL that the client last requested: HttpContext.Current.Request.UrlReferrer.Host;)

10. Get exception information: HttpContext.Current.Server.GetLastError ();

ASP. NET global Application class