Multiple database access from the same DbContext in Entity Framework Core 5. It is not uncommon to have a requirement to access tables or views in different databases in the same query. In order to be able to do your joins on tables or views in different databases you need to do it in the same connection instance which is bound to DbContext. Firstly, Install this package on the WebApi Project. This allows you to run EF Core commands on the CLI. Install-Package Microsoft.EntityFrameworkCore.Tools, Next, Navigate to Startup.cs and add this line to Register the ApplicationContext class that we created.
Therefore, always await async calls immediately, or use separate DbContext instances for operations that execute in parallel. When EF Core detects an attempt to use a DbContext instance concurrently, you'll see an InvalidOperationException with a message like this: A second operation started on this context before a previous operation completed.
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We select the MVC 5 Controller with views, using Entity Framework option: Finally, we arrive at the Add Controller dialog where we can fill in the model class and the data context class we implemented before. Make sure to select a model and a data context class. Otherwise, the Add button of the dialog won't be enabled and you cannot click it. The first thing we need is a .net project. I'll use a .net core 2 web application, but any project that uses .net 4.6.1+, and hence, supports Entity Framework Core 2 will suffice. In order to be able to do database first we need a database. Then we'll use Entity Framework tooling to generate the models and dbContext that work with our database.
Create a .NET Core Class Library. From Visual Studio File Menu -> Click on New Project. From left the pane of New Project dialog box select Visual C# or Visual Basic -> .NET Core. Then from middle pane select Class Library (.NET Core) Give a name to the project of your choice or GeeksStoreDataAccess. You may remove Class1.cs file.
With DbContext, you'll be able to query and update data, whether you're working with individual objects or graphs of objects and their related data. You'll find numerous C# code samples to help you get started. All you need is experience with Visual Studio and database management basics.
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