Why can't I reference classes in app_code? (discussed in csdn)

For Web ApplicationsProgramYou cannot add an ASP. NET folder by right-clicking project> Add->. Because the app_code in the Web application does not exist. However, you can manually create a folder and name it app_code. In this way, the app_code created in the website looks the same. Don't be happy. It's not that simple. When you create a class in app_code, you will find no smart prompts. When the page is referenced in the background, an error is reported, indicating that the reference does not exist. The solution is to select your class file and change the "generate operation" default "content" in the "advanced" attribute to compile. This is enough. You can also add "app_localresources" to the Web application project. You can add classes in this folder without adding the app_code folder. You can also create any folder or directly add classes without folders. You only need to modify the "generate operation" of the class's advanced attributes to "compile ".

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published on: 01:24:37 7 floor score: 0 to: zylovegxs your answer is too good. I have found many posts, many people have encountered the same problem and got the correct answer here. after SP1 is installed, the classes in app_code cannot be automatically referenced because they do not pass the settings you mentioned. many people have replied that they can use namespace. classname directly, but they cannot. thank you for your answer. It helped me solve the big problem.