When EF is used in vs2010, CS0012: type "System. Data. Objects. DataClasses. EntityObject" is defined in the unreferenced assembly.

After checking the information on the Internet, you can configure System. Data. Entity, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = b77a5c561934e089 "in web. config"

Invalid

 

Solution: copy the System. Data. Entity. dll file to the C: \ Program Files (x86) \ Reference Assemblies \ Microsoft \ Framework \. NETFramework \ v4.0 directory.

Just go to the bin directory of the website.

  Compilation error

Note:An error occurs during compilation of resources required to provide services to this request. Check the following error details and modify the source code as appropriate.

Compiler error message:CS0012: the type "System. Data. Objects. DataClasses. EntityObject" is defined in an unreferenced assembly. You must add references to the assembly "System. Data. Entity, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = b77a5c561934e089.

SOURCE error:

Row 34: Row 35: Row 36: public class _ Page_Views_Home_Index_cshtml: System. Web. Mvc. WebViewPage <List <MvcModel. ContactInfo> {row 37: row 38: # line hidden

Source File:C: \ Windows \ Microsoft. NET \ Framework \ v4.0.30319 \ Temporary ASP. NET Files \ root \ 0b73bef1 \ b9073c89 \ App_Web_index.cshtml.a8d08dba.Row:36

When EF is used in vs2010, CS0012: type "System. Data. Objects. DataClasses. EntityObject" is defined in the unreferenced assembly.