App_Code folder is missing in VS 2010

问题:

I was trying to create a Dynamic Data Website using VS 2010 RC. An attempt to create an App_Code folder where I would put a LINQ to SQL class, failed. When I selected 'Add ASP.NET Folder' to add the folder, I had options to create only the following folders:

• App_GlobalResources
• App_LocalResources
• App_Data
• App_Browsers
• Theme

What happened to the App_Code folder?

回答1:

Why not create another project, a class library, and put it in there. That's by far the best way to keep those classes separate from the rest of your website.

To answer your specific question about the App_Code folder, it's available in WebSite projects as an Asp.Net folder you can choose from. But from a web application project, you can just create a new folder and name it App_Code and it will work just fine. This is as of Visual Studio 2010 RC.

回答2:

you can't/shouldn't add the App_Code folder to a Web Application because this folder is designed for runtime compilation by asp.net and the Web Application project is designed for you to precompile your website into a dll which you can find in the Bin folder and deploy to your site. If you do add this manually, you may end up getting name clashes as the class will be precompiled to the dll and then asp.net will again try to recompile at runtime.

So, for Web App Projects, you should instead Add a folder called something like 'CodeFolder' and then add you class in there. Then right click properties on that class file and set its build config to compile rather than content.

I am working on my own web project for www.athenatennis.com.sg and am going thru a similar learning curve with that.

回答3:

You can manually create the App_Code folder and add your class inside. One thing you need to take note is... in the file properties, make sure the Build Action is set to Compile.

回答4:

I also found this funny that it is missing. The thing is you "don't" need to create the App_Code folder you just add the classes to any new folder.

In VS 2005 any class outside the App_Code would give a compile error.

So I also want to know why they decided to remove this constraint? Was it because of people complained about it, or did the design concept changed and it was deemed necessary?

回答5:

in VS 2010, you need to create a solution, then right-click -> add new website, then when you add classes, linq2sql etc, vs will create the app_code folder for you

回答6:

If you want app_code folder, you must create "ASP.NET web site". Once done, right click on website (Solution Explorer)-> Add ASP.NET folder->App_Code.

If you are looking at app_code folder inside "ASP.NET web application", you are wasting time.

回答7:

if you create a class, it will ask you if you want to add it on a App code folder.

回答8:

It is very easy just add the new class from Add New Item Visual Studio 2010 will automatically show the message that "Do You want to place the file in App_Code Folder".Just click ok.![enter image description here][1]