The type or namespace name 'DbContext' could not be found [closed]

Answer 1

I also get irritated from this issue many times and finally find the solution.Go to edmx file->Update Model from Database->Refresh->Finish. Clean Solution->Rebuild Solution

Answer 2

I have faced same issue and then i have add the namespace

using Practiceusingentityframework.Models;

After Adding it's Working fine

Try this may help you to solve your problem

and before that install the entity framework from Nuget Manager

Answer 3

I have the same issue as you, I'm unable to implement it in the Controller class while it works when I put it in the model class. Add these codes on the top of your controller class

 using TimeSheetManagementSystem.Data;
 using Microsoft.Extensions.Configuration;
 using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
 using Newtonsoft.Json;

Answer 4

If your compiler doesn't recognize

• System.Data.Entity.Infrastructure
• DbContext
• DbSet
• et alii,

make sure

1. you have Entity Framework 4.1 installed on your machine;

2. in your .csproj file, you have the following reference

   <Reference Include="EntityFramework, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL" />
   

   within the element

   <ItemGroup>
     ...
   </ItemGroup>
   

   that houses references to other assemblies.

Answer 5

This happened to me when I branched code. To fix it I right-clicked my project in Visual Studio, chose manage Nu-get packages, uninstalled EntityFramework, then re-installed it. Problem solved

Answer 6

Use CTP5 instead it is newer version with some changes in API. You have to add reference to EntityFramework.dll which is installed in CTP directory - default is: c:\Program Files\Microsoft ADO.NET Entity Framework Feature CTP5\Binaries\EntityFramework.dll for 32bit system. On 64bit system it will be placed in Program Files (x86).