Web Pages in ASP. net mvc 3 basic tutorial

I: special files starting with "_" in Web Pages 1.0 (the file name is case-insensitive)

"_ Appstart. cshtml" & "_ pagestart. cshtml" & "_ viewstart. cshtml"

_ Appstart. cshtml-run the following command after the Global. Application_Start method when the application starts.

Function: content to be processed during App initialization. For example, some information initialized to the database is recorded.

Function and Global. application_Start is similar. The difference is that the Global Start is executed first and then to this _ appStart. It is worth noting that it can be used in the _ appStart context. new dynamic Features of NET4 ~~ The Declaration is a type of attribute, field, indexer, parameter, return value, or type constraint.

Http://msdn.microsoft.com/zh-cn/library/dd264741.aspx

 
 

  
  
 
  
  
 
  
  
@{
  
  
This. App. StartMessage = "the App has been successfully started. Congratulations! Ha ";
  
  
Var error = this. App. Error as string;
  
  
If (error = null)
  
  
{
  
  
This. App. Error = "before using the new dynamic feature, assign a value ~ ";
  
  
Error = this. App. Error;
  
  
@*
  
  
It is a pity that dynamic does not support smart sensing.
  
  
The program execution sequence cannot be accurately identified by 100% during compilation.
  
  
Therefore, smart sensing is impossible!
  
  
*@
  
  
}
  
  
// The App. Error dynamic field can be referenced here.
  
  
}
 
 

 
 

  
  
//--------------------------------------------  
  
  
@{  
  
  
    @* ~/Views/_ViewStart.cshtml *@  
  
  
    Response.Write(string.Format(" 
  
    Layout = "~/Views/Shared/_Layout.cshtml";  
  
  
} 
 
 

 

Members from:

At System. Web. WebPages. Razor. WebPageRazorHost

At System. Web. WebPages. ApplicationStartPage

_ Viewstart. cshtml-executed when a single View processes a Request

Function: Maybe you already think of it .... Global Page_Load (for View only )......

The execution sequence is after _ appstart. cshtml. After all, the layers are different.

Members from:

At System. Web. Mvc. RazorViewEngine

In conclusion, the APP initialization sequence of MVC3 is:

 

(Other file types that I cannot find are not excluded, but I know the three most widely used files)

In Web Pages 1.0, unless you explicitly name a View starting with "_", you will receive the following error message when requesting a page starting "_":

(This figure has been posted when Razor syntax is used. Here we post it to let everyone know about it)

About the format of class names generated by *. cshtml

Assembly format generated for most pages

 

Page compilation uses individual page compilation as a single assembly with a random string. Of course, you can also use the pre-Compilation Method to compile n pages into one assembly.

II: execution sequence of special files starting with "_" in multiple directories

_ Appstart. cshtml can only be stored in the root directory ("~ /"),

If you place the _ appstart. cshtml file in the subdirectory, the file will not be executed during App initialization.

When accessing ~ /Somepage. cshtml.

Will be executed first ~ /_ PageStart. cshtml

Then execute ~ /Somepage. cshtml

In a complex subdirectory environment:

~ /_ PageStart. cshtml

~ /Sub/_ pageStart. cshtml

~ /Sub/somepage. cshtml

III: How to enable Web Pages 1.0 from WebForms

First, Web Pages use features to hook up with ASP. NET on its own assembly.

 
 

  
  
// SourceFile: AssemblyInfo. cs (System. Web. WebPages. dll)
  
  
// AttributeClass: System. Web. PreApplicationStartMethodAttribute
  
  
// Feature Introduction: Provides extensions for other ASP. NET Provide
  
  
// Parameter 1: ASP. NET Provide type
  
  
// Parameter 2: name of the running Method
  
  
// Source:
  
  
[Assembly: PreApplicationStartMethod (typeof (System. Web. WebPages. PreApplicationStartCode), "Start")] // Line: 15
 
 

Then, we can see that ASP. NET Provide of Web Pages is. Web. WebPages. PreApplicationStartCode.

The Start method is Start.

 
 

  
  
Public static void Start (){
  
  
// Even though ASP. NET will only call each PreAppStart once, we sometimes internally call one
  
  
// Another PreAppStart to ensure that things get initialized in the right order. ASP. NET does
  
  
// Order so we have to guard against multiple CILS.
  
  
// All Start callare made on same thread, so no lock needed here.
  
  

  
  
If (_ startWasCalled ){
  
  
Return;
  
  
}
  
  
_ StartWasCalled = true; // The Start method has been called.
  
  

  
  
WebPageHttpHandler. RegisterExtension ("cshtml"); // register the extension
  
  
WebPageHttpHandler. RegisterExtension ("vbhtml"); // register the extension
  
  

  
  
// Turn off the string resource behavior which wocould not work in our simple base page
  
  
PageParser. EnableLongStringsAsResources = false; // Optimization Options
  
  

  
  
DynamicModuleUtility. RegisterModule (typeof (WebPageHttpModule); // The focus is here .~~ Registered a WebPageHttpModule
  
  

  
  
ScopeStorage. CurrentProvider = new AspNetRequestScopeStorageProvider ();
  
  
// RequestScopeStorageProvider of ASP. NET Web Pages
  
  
}
 
 

IV: Appendix: Global execution sequence

When the WebApp starts running

Application_Start

Application_BeginRequest

Application_AuthenticateRequest

Session_Start

When the WebApp stops running

Session_End

Application_End

When a Request is inbound

Application_BeginRequest

Application_AuthenticateRequest and then reaches *. cshtml

When *. cshtml throw new Exception ();

 
 

  
  
Application_BeginRequest
  
  
Application_AuthenticateRequest
  
  
Application_Error (go to at throw and do not execute the following after *. cshtml throw)
  
  
Example:
  
  
@{
  
  
Throw new Exception (); // For example only
  
  
// The following will not be executed, but will jump directly to Application_Error to terminate Response
  
  
}