dlls missing after publishing .NET Web

Question

My web project use .NET Framework 4.7.2 and use some references like

• System.IO
• System.Net
• System.Net.Http
• System.Net.Http.Formatting

My project works perfectly in local. However, when I publish my web project on a target directory (for online), and look what it contains in /bin/ :

• System.IO is missing
• System.Net is present
• System.Net.Http is missing
• System.Net.Http.Formatting is present

Therefore, when I use my website, I get the obvious error Could not load file or assembly 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. Could not load file or assembly 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

All references have Copy Local = True in Properties but some dll are always ignored. If i copy the dlls from local directory to target directory i get the error Server Error in '/' Application. Cannot load a reference assembly for execution. Exception Details: System.BadImageFormatException: Cannot load a reference assembly for execution. Server Error in '/' Application. Cannot load a reference assembly for execution. Exception Details: System.BadImageFormatException: Cannot load a reference assembly for execution. Exactly the same problem as this one. However the delete/rebuild solution, or adding compilation options solution, doesn't work for me

What do I need to do to get these missing dlls to the destination folder?

Answer 1

Go to Solution Explorer on VS, open references tree, right click on the library(dll) and select properties on the menu. On properties box Copy Local should be True