Entity Framework Core DbContextOptionsBuilder does not contain a definition for usesqlserver and no extension method usesqlserver

Question

I am new to EF core and I m trying to get it to work with my ASP NET Core project  I get the above error in my startup cs when trying configure the DbContext to use a connection string from config  I am following this tutorial  The problematic code in startup cs  using System  using System Collections Generic  using System Linq  using System Threading Tasks  using Microsoft AspNetCore Builder  using Microsoft AspNetCore Hosting  using Microsoft AspNetCore SpaServices Webpack  using Microsoft Extensions Configuration  using Microsoft Extensions DependencyInjection  using Microsoft Extensions Logging  using Microsoft EntityFrameworkCore  using tracV2 models  using tracV2 data   namespace tracV2       public class Startup                  This method gets called by the runtime  Use this method to add services to the container          public void ConfigureServices IServiceCollection services                           Add framework services              services AddMvc                 services AddSingleton lt IConfiguration gt  Configuration                string conn   Configuration GetConnectionString  quot optimumDB quot                 services AddDbContext lt tracContext gt  options   gt  options usesqlserver conn               The UseSqlServer method is recognized if I put it directly into the context  using System  using System Collections Generic  using System Linq  using System Threading Tasks  using Microsoft EntityFrameworkCore   namespace tracV2 data       public class tracContext   DbContext               protected override void OnConfiguring DbContextOptionsBuilder optionsBuilder                        optionsBuilder UseSqlServer  quot myrealconnectionstring quot               All my research online points to missing references  but I can t seem to find out which one I am missing  see image

User · Answer

For me this issue happened with Visual Studio Code and I was able to fix with 2 steps    Manually adding using Microsoft EntityFrameworkCore  Running dotnet build in terminal

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Currently working with Entity Framework Core 3 1 3  None of the above solutions fixed my issue   However  installing the package Microsoft EntityFrameworkCore Proxies on my project fixed the issue  Now I can access the UseLazyLoadingProxies   method call when setting my DBContext options   Hope this helps someone  See the following article   Lazy Loading in EF Core

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I had this trouble when I moved to Microsoft EntityFrameworkCore SqlServer v3 0 0 and Microsoft EntityFrameworkCore Tools v3 0 0  When I changed back to v2 2 6 on both libraries  the error went away  This is more of a workaround than a solution but it ll get you up and running till the issue is fixed

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I had same issue but problem went off after going back and fixing DbContext incorrect syntax issue such as it should have been ExampleDbContextClass  DbContext whereas I had missed DbContext part in Context Class where you define your DbSet  Also  I verified following dependencies are needed in order to achieve connection to SqlServer   lt PackageReference Include  quot Microsoft EntityFrameworkCore SqlServer quot  Version  quot 3 1 0 quot    gt   lt PackageReference Include  quot Microsoft EntityFrameworkCore SqlServer Design quot  Version  quot 1 1 6 quot    gt  Also verify that Version you install is less than your project s current version to be on safe side  Such as if your project is using 3 1 do not try to use newer one which would be for example 3 1 9  I had issue with that too

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I had to use the line  services AddEntityFrameworkSqlite   AddDbContext lt MovieContext gt  options   gt  options UseSqlServer Configuration GetConnectionString  quot MovieContext quot       in the ConfigureServices method in the Startup cs

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your solution works great  When I saw this video till 17 Minute   https   www youtube com watch v fom80TujpYQ I was facing a problem here   services AddDbContext lt PaymentDetailContext gt  options   gt      options UseSqlServer Configuration GetConnectionString  quot DevConnection quot       UseSqlServer not recognizes so I did this Install-Package Microsoft EntityFrameworkCore SqlServer -Version 3 1 5  amp  using Microsoft EntityFrameworkCore  Then my problem is solved  About me  basically I am a purely PHP programmer since beginning and  today only I started  net coding  thanks for good community in  net

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I had this issue  it seems that I hadn t added the required NuGet packages  although I thought I had done so  make sure to check them  one by one

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first add Install-Package Microsoft EntityFrameworkCore SqlServer next add in your  cs file using Microsoft EntityFrameworkCore  finally add this in your core Startup cs   public void ConfigureServices IServiceCollection services                        services AddEntityFrameworkSqlServer   AddDbContext lt ApplicationContext gt  options   gt  options UseSqlServer Configuration GetConnectionString  quot MovieContext quot

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Wow so many answers yet none mentioned this Microsoft EntityFrameworkCore InMemory package   Add the reference to this package    lt PackageReference Include  Microsoft EntityFrameworkCore InMemory  Version  2 2 2    gt  and you should be good to go

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I got around this by simply   Add SqlServerDbContextOptionsExtensions to the class in question Resolve SqlServerDbContextOptionsExtensions  This fixes the issue  must be missing some reference by default

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I also had the same problem  I added the following  It works for me Microsoft EntityFrameworkCore SqlServer

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If you are facing this issue in case of Sqlite then     I think this is the problem with version of Sqlite I had the same problem when I was using this versions of SqLite  Version 2 2 4     After checking version here  I changed the version then it worked     No error after using this  Version 2 1 2

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Install the following packages from Nuget  -  Microsoft EntityFrameworkCore Microsoft EntityFrameworkCore Sqlite Core

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Easy way to fix this issue      Error message    Solution  to install  microsoft entityframeworkcore sqlserver  with NuGet   Fixed     PS  make sure you have using EF on the content  using Microsoft EntityFrameworkCore

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For anyone still having this problem  Use NuGet to install  Microsoft EntityFrameworkCore Proxies  This problem is related to the use of Castle Proxy with EFCore

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I installed these three of them in the package manager console and it worked  Install-Package Microsoft VisualStudio Web CodeGeneration Design -Version 3 1 4 Install-Package Microsoft EntityFrameworkCore Tools -Version 3 1 8 Install-Package Microsoft EntityFrameworkCore SqlServer -Version 3 1 8

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This is a known issue in the project system  See dotnet project-system 1741

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Project -  ManageNugetPackages -  Browse -  Search  Microsoft EntityFrameworkCore SqlServer  and install or update

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Follow the steps below  Install Entity Framework Core Design and SQL Server database provider for Entity Framework Core  dotnet add package Microsoft EntityFrameworkCore Design dotnet add package Microsoft EntityFrameworkCore SqlServer  Import Entity Framework Core  using Microsoft EntityFrameworkCore   And configure your DbContext  var connectionString   Configuration GetConnectionString  quot myDb quot    services AddDbContext lt MyDbContext gt  options   gt       options UseSqlServer connectionString

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Install below NuGet Package will solve your issue  Microsoft EntityFrameworkCore SqlServer     Install-Package Microsoft EntityFrameworkCore SqlServer

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The Package is missing  Open Package Manager Console and execute the code below   Install-Package Microsoft EntityFrameworkCore SqlServer

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As mentioned by top scoring answer by Win you may need to install Microsoft EntityFrameworkCore SqlServer NuGet Package  but please note that this question is using asp net core mvc   In the latest ASP NET Core 2 1  MS have included what is called a metapackage called Microsoft AspNetCore App  https   docs microsoft com en-us aspnet core fundamentals metapackage-app view aspnetcore-2 2  You can see the reference to it if you right-click the ASP NET Core MVC project in the solution explorer and select Edit Project File    You should see this metapackage if ASP NET core webapps the using statement   lt PackageReference Include  Microsoft AspNetCore App    gt   Microsoft EntityFrameworkCore SqlServer is included in this metapackage  So in your Startup cs you may only need to add   using Microsoft EntityFrameworkCore

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I believe this can be solved by adding a project reference to Microsoft EntityFrameworkCore SqlServer Design  Install-Package Microsoft EntityFrameworkCore SqlServer Design   Microsoft EntityFrameworkCore SqlServer wasn t directly installed in my project  but the  Design package will install it anyway as a prerequisite

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adding  using Microsoft EntityFrameworkCore    manually solved the problem for me  Found that here  Edit     for dotnet core 3 1 add  Microsoft EntityFrameworkCore SqlServer

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For asp net core version 2 1 make sure to add the following package to fix the problem   At least this fix the issue using SQLite   dotnet add package Microsoft EntityFrameworkCore Sqlite dotnet add package Microsoft EntityFrameworkCore Design   Here is the reference of the documentation using SQLite with entity framework core  https   docs microsoft com en-us ef core get-started netcore new-db-sqlite

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Install-Package      Microsoft EntityFrameworkCore SqlServer     then add the top of your class      Microsoft EntityFrameworkCore      that s worked for me

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In Visual Studio  check the NuGet Package Manager    Manage Packages for Solution  check all this packages  whether got installed in your solution or not  as below     EntityFrameworkCore Microsoft EntityFrameworkCore Microsoft EntityFrameworkCore InMemory Microsoft EntityFrameworkCore Relational Microsoft EntityFrameworkCore Sqlite Core Microsoft EntityFrameworkCore SqlServer Microsoft EntityFrameworkCore Tools   I solved the same issues after check all the above packages have been installed

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First we install the Microsoft EntityFrameworkCore SqlServer NuGet Package  PM  gt  Install-Package Microsoft EntityFrameworkCore SqlServer  Then  after importing the namespace with using Microsoft EntityFrameworkCore   we add the database context  services AddDbContext lt AspDbContext gt  options   gt      options UseSqlServer config GetConnectionString  quot optimumDB quot

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I was using Visual Studio Code   1  Try to install the package  Microsoft EntityFrameworkCore SqlServer  by specifying the version number   VS Code    dotnet add package Microsoft EntityFrameworkCore SqlServer -v 1 1 1   Visual Studio -   Install-Package Microsoft EntityFrameworkCore SqlServer -v 1 1 1   Refer the link  Package   39 Microsoft EntityFrameworkCore SqlServer  39  is incompatible with   39 all  39  frameworks in the project  for doing it   2  Then add the namespace  using Microsoft EntityFrameworkCore   manually  in the Startup cs file   Refer the below link https   github com aspnet EntityFramework issues 7891   3  If you get any dependency issue for  Microsoft EntityFrameworkCore SqlServer Design   like  Package  Microsoft EntityFrameworkCore Design  is incompatible with  all  frameworks in project   we need to run the below command   VS Code -  dotnet add package Microsoft EntityFrameworkCore Design -v 1 1  Visual Studio  Install-Package Microsoft EntityFrameworkCore Design -v 1 1

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Project is works in DotNET Core 3 1  or higher future  Add this package   NuGet     Microsoft EntityFrameworkCore Tools Project Config   csproj    lt PackageReference Include  quot Microsoft EntityFrameworkCore Tools quot  Version  quot 3 1 8 quot  gt

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Install package  EntityFrameworkCore SqlServer    PM gt  Install-Package Microsoft EntityFrameworkCore SqlServer -Version 3 1 3   Nuget  https   www nuget org packages Microsoft EntityFrameworkCore SqlServer

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Copying the following code into the TodoApi csproj from https   github com aspnet Docs tree master aspnetcore tutorials first-web-api sample TodoApi solved similar issue for me   lt Project Sdk  quot Microsoft NET Sdk Web quot  gt      lt PropertyGroup gt       lt TargetFramework gt netcoreapp2 0 lt  TargetFramework gt     lt  PropertyGroup gt      lt ItemGroup gt       lt Folder Include  quot wwwroot  quot    gt     lt  ItemGroup gt      lt ItemGroup gt       lt PackageReference Include  quot Microsoft AspNetCore All quot  Version  quot 2 0 0 quot    gt     lt  ItemGroup gt      lt ItemGroup gt       lt DotNetCliToolReference Include  quot Microsoft VisualStudio Web CodeGeneration Tools quot  Version  quot 2 0 0 quot    gt     lt  ItemGroup gt    lt  Project gt   Microsoft AspNetCore All may be excessive but it includes EntityFrameworkCore

[asp.net-core] Entity Framework Core: DbContextOptionsBuilder does not contain a definition for 'usesqlserver' and no extension method 'usesqlserver'

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