问题
For one of the solutions, I don't see the Clean Solution option neither in the context menu when I right click on the solution name in the Solution Explorer nor in the Build menu. When I make any changes to the project and debug, VS never hits the break point and I get the "The breakpoint will not currently be hit. The source code is different from the original version." message. My understanding is that I need to clean the solution.
For other solutions, I do see the Clean solution and I don't have the same issue.
回答1:
Finally had to create a brand new solution and add the projects from the older solution to the newly created one. Not sure what the problem was, but this helped.
回答2:
I also faced the similar problem recently and this is what I came to.
回答3:
If you are using website project then their wont be clean solution option,it's available only with web application projects.
回答4:
I guess you are running an older code version than the one you want to debug on. Rebuild the project(s), paying attention to dependencies. Use the "Rebuild" feature.
回答5:
I had the same problem. Visual Studio was building my old code with debug. I opened a new instance of Visual Studio and opened my solution with it and it now works fine. No idea what happened.
回答6:
If it's a Web application project, just clean it yourself by nuking all DLLs in the bin. Then rebuild. I assume it builds without errors?
回答7:
You can also clean using devenv /clean SolnConfigName SolutionName in the command line environment.
Here is the reference: http://msdn.microsoft.com/en-us/vstudio/aa718635.aspx
回答8:
If you're running a web site, as apposed to a web application project, you probably don't have an actual solution, or even a project file.
For a web site, you need to rebuild the website (from the build menu), or manually delete all of the dlls to accomplish the same thing.
Edit:
How are you debugging? Are you using Cassini (the built in visual studio debugger), or attaching to an IIS process?
I would also try this:
Go to C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files and delete the folder that has the same name as your website.
来源：https://stackoverflow.com/questions/2828797/dont-see-clean-solution-option-in-visual-studio