Class Library .net Standard Entity Framework !!

c# - Issues With Adding Entity Framework to .Net Standard Class Library

I am trying to add entity framework to a .Net Standard 2.0 Class Library. I have tried creating the classes from the DB. I ran the following Command in the nuget package manager console. Scaffold-DbContext "Server=localhost;Database=FlexDB;uid=root;pwd=ffff;Trusted_Connection=True;" MySql.Data.EntityFrameworkCore -OutputDir EFModels/DB I have tried creating the classes from the DB. I ran the following Command in the nuget package manager console.

Startup project 'FlexData' targets framework '.NETStandard'. There is no runtime associated with this framework, and projects targeting it cannot be executed directly. To use the Entity Framework Core Package Manager Console Tools with this project, add an executable project targeting .NET Framework or .NET Core that references this project, and set it as the startup project; or, update this project to cross-target .NET Framework or .NET Core.

To run such commands you need a library targeting a runtime (Full or core framework).Just create an additional project, e.g. a console project targeting .NET 4.5 or newer, and a reference to your .NET standard library.After setting the new project as the startup project you can then run the command against your original project and get the DB scaffolded in there.

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AspNet Core MVC + Class Library (.Net Standard) with Entity Framework

AspNet Core MVC + Class Library (.Net Standard) with Entity Framework. I'm using Visual Studio 2017 and I'm building my first Asp.Net Core MVC site and I want to create also a Class Library (.Net Standard) as My Data Access Layer. In this last library I want to use Entity Framework to connect to my database. I'm using Visual Studio 2017 and I'm building my first Asp.Net Core MVC site and I want to create also a Class Library (.Net Standard) as My Data Access Layer. In this last library I want to use Entity Framework to connect to my database.I tried to use Entity Framework Core but I don't know how to create an EDMX file to map my database.Is there another way to do this with Entity Framework Core?

Entity framework has the power to the point that you may consider not explicitly mapping any of your database at first. Entity framework does most of the mapping for you.

I was in the same boat as you about a year ago and I got a lot of help from this example. It is the Contoso University Example: https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application

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Entity Framework in .NET Standard Library - Stack Overflow

Current start the new application in .net core and slowly migrate the existing Web API to .net core. The data layer libraries need to be compatible with existing Web API (.net Framework) and new application (.net core) For compatibility, i am thinking to migrate my data layer libraries to .net standard. I have a Web API application which targets .net framework 4.6.2. Now i need a scheduler like app so i am planning to create aws lambda function for this. In order to do that i am planning to create the new one in .net core. But my current priority does not allow to migrate entire application to .net core now.

EF Core 2.0 targets .NET Standard 2.0. There are step-by-step tutorials of how to use it with .NET Core and the .NET Framework in the docs.

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Class library projects : .NET Framework, .NET Core, and .NET Standard

Class Library (.NET Framework) : This can be found under Visual C# > Windows Desktop option of the New Project dialog. Class Library (.NET Core) : This can be found under Visual C# > .NET Core option of the New Project dialog. Class Library (.NET Standard) : This can be found under Visual C# > .NET Standard option of the New Project dialog. As an example the following figure shows the .NET Standard class library in the New Project dialog of Visual Studio 2017. Recently Microsoftannounced the release of .NET Standard 2.1. You might have already noticed different project templates in Visual Studio 2017 that allow you to build class libraries such as .NET Framework class library, .NET Core class library, and .NET Standard class library. As a beginner you might have wondered what exactly is the difference between them. To that end this article briefly explains each of these three types of class libraries.

Before we go ahead and discuss the flavors of class library projects, let's first quickly understand the three terms - .NET Framework, .NET Core, and .NET Standard.

.NET Framework is implementation of .NET that runs on Windows platform. This is the flavor of .NET we all know for a long time. It allows you to build windows desktop applications as well as ASP.NET web forms and ASP.NET MVC applications. .NET framework was first released in 2002 and its current stable version is 4.7.

.NET Core is a new modular framework that is cross-platform and open source. It allows you to build console apps and ASP.NET Core apps. .NET Core was released in 2016 and its current stable version is 2.1.

Besides .NET Framework and .NET Core there is Mono based runtime - Xamarin - that allows you to build mobile apps (iOS and Android etc.) .

.NET Standard is a set of APIs that all .NET platforms need to implement. The latest version of .NET Standard specification is 2.1. The .NET Framework 4.7 and .NET Core 2.1 implement .NET Standard 2.0. The .NET Framework 4.8 will continue to implement .NET Standard 2.0 and .NET Core 3.0 (and also Mono and Xamarin) will implement .NET Standard 2.1.

As an example the following figure shows the .NET Standard class library in the New Project dialog of Visual Studio 2017.

The answer to this question depends on what you are trying to achieve. It is about platforms you wish to target vs. platform specific APIs.

If your application is intended to run on .NET Framework alone then the first option is what you need. If you want to target .NET Core alone then the second option is what you need. However, if you want your code to run on all the available .NET platforms - .NET Framework, .NET Core, and Xamarin (Mono) - then you will need to go for the third option.

So, basically going for .NET Standard class library increases your platform support whereas picking a class library flavor targeted for a particular .NET platform will allow you to use all the platform features for that platform.

When you create a new .NET Standard class library project by default it targets .NET Standard 2.0 specifications. If you wish to change the target version you can do so in project property pages.

The target frameworks discussed above have what is known as Target Framework Moniker (TFM). It's basically an alias used for a particular framework. For example, .NET Framework has TFMs such as net46 (.NET Framework 4.6) and net47 (.NET Framework 4.7). TFMs used for .NET Core are - netcoreapp2.0 (.NET Core 2.0) and netcoreapp2.1 (.NET Core 2.1). Finally, TFMs for .NET Standard include - netstanadrd1.6 (.NET Standard 1.6) and netstandard2.0 (.NET Standard 2.0).

TFMs are often mentioned in the project *.csproj files. For example, have a look at the following markup from a sample *.csproj :

     

Is it possible to use Entity Framework 6.3.0 in a .NET Standard 2.0

The .NET target means, of course, that the library can be consumed by .NET Framework projects of the same .NET version or higher. The .NET Standard 2.1 target allows the library to be consumed by projects targeting .NET Standard 2.1, .NET Core 3.0, Mono 6.4, and higher, plus the latest versions of Xamarin. The notable omission is versions of .NET Core prior to 3.0. EF6 is not available to .NET Core 1 or 2. See the .NET Standard .NET implementation support table for the full list. The type or namespace name 'Entity' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?)

6.3.0 was the first version of Entity Framework 6 to target .NET Standard; it targets .NET Standard 2.1 along with .NET 4.0 and .NET 4.5, as can be seen in its Nuget listing. 6.2.0 only targeted .NET.

Depending on your scenario, you might be able to get away with multi-targeting your library to .NET (in my example below, .NET 4.7.2) and .NET Standard 2.1:

Your other references. The combination I offer above will be fine in most cases as .NET 4.7.2 and .NET Standard 2.1 can reference .NET Standard 2.0 packages, which covers most but by no means all modern packages.

The frameworks that you wish to consume your library from. The .NET target means, of course, that the library can be consumed by .NET Framework projects of the same .NET version or higher. The .NET Standard 2.1 target allows the library to be consumed by projects targeting .NET Standard 2.1, .NET Core 3.0, Mono 6.4, and higher, plus the latest versions of Xamarin. The notable omission is versions of .NET Core prior to 3.0. EF6 is not available to .NET Core 1 or 2. See the .NET Standard .NET implementation support table for the full list.

* I have used .NET 4.7.2 for my illustration because whilst .NET 4.6.1 officially supports .NET Standard 2.0, Microsoft recommend using 4.7.2 or higher. See my answer here for more information.

c# - Using Entity Framework Core migrations for class library project

Type: .NET Standard 2.0 class library. Dependencies: ClassLibrary1; Microsoft.EntityFrameworkCore (v2.1.1) Microsoft.EntityFrameworkCore.SqlServer (v2.1.1) Microsoft.EntityFrameworkCore.Tools (v2.1.1) This project, in my test solution, contains only one class: the database context. ClientDbContext.cs Projects 2 and 3 are referenced in my main WPF project. So basically, it should be enough for the EF to resolve the DbContextes.

In this class a defined an used the connection string to connect to the database (assuming it's LocalDb SQL Server). If you want to put the connection string in a config file, you could add a shared config file in your solution and then reference that file in your App.config file (for more informartion take a look at this page)

In order to be able to add migrations on this project without setting as startup project other projects, you must set the target framework. Right click on the project and click on the Edit EFClassLibrary.csproj entry. Below the netstandard2.0 line, you should add another line which specify which framework you want to target. To target the .NET Framework 4.7 you should add

Now you are ready to add your first migration. Open the Package Manager Console and set as default project the EFClassLibrary. Also, set that project as startup project (right-click on the project and click on the Set as startup project entry).

What microsoft suggests here is to create a new class library for the migrations, then move your model snapshots files and migrations to the new class library.

In your startup project you have to create a factory which will implement IDesignTimeDbContextFactory and create the DBContext for you.

I was using class library project as data layer and asp.net core project as start up project.First I registered my E.F core context in asp.net start up class.

Then in my context class(located in class library project) I provided connection string from setting file and used it in OnConfiguring method.

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EntityFramework Core 2.1 in .NET Standard 2.0 NuGet package – Arve's

Add a new .NET Standard library. Add the following NuGet packages to this project: Microsoft.EntityFrameworkCore; Microsoft.EntityFrameworkCore.SqlServer; DbContext and Entities. Lets create the DbContext and an table/entity. Add a folder to your project called Entities and remove the Class1.cs file.

Creating and Packaging a .NET Standard library | Visual Studio Blog

A .NET Standard Library is a class library that targets .NET Standard. .NET Standard is a formal specification of .NET APIs that are intended to be available on all .NET implementations. The motivation behind .NET Standard is to establish greater uniformity in the .NET ecosystem. Click Next to proceed. You’ll be prompted to select the Target Framework.

What is the difference between .NET Core and .NET Standard Class

.NET Standard 2.0 includes a compatibility shim for .NET Framework binaries, significantly increasing the set of libraries that you can reference from your .NET Standard libraries. .NET Standard will replace Portable Class Libraries (PCLs) as the tooling story for building multi-platform .NET libraries.

Using EF Core in a Separate Class Library project | Gary Woodfine

Using Entity Framework developers work at a higher level of abstraction which helps to create and maintain data oriented applications with less code and without having to work directly within in the Database platform. Entity Framework Features. Cross-platform: EF Core is a cross-platform framework which can run on Windows, Linux and Mac class library .net standard entity framework

class library .net standard entity framework

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