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#Ef core sql server connection string code
Use Code First with connection string in app.config/web.config file If both are installed, SQL Express will be used. In this example DbContext uses “BloggingDatabase” as the database name and creates a connection string for this database using either SQL Express (installed with Visual Studio 2010) or LocalDB (installed with Visual Studio 2012). For example: public class BloggingContext : DbContext If you have not done any other configuration in your application, then calling the string constructor on DbContext with the database name you want to use will cause DbContext to run in Code First mode with a database connection created by convention to the database of that name.
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Use Code First with connection by convention and specified database name No changes are made to the configuration file if it already contains a setting for the default connection factory. If SQL Express is not available then LocalDB will be registered as the default instead. If SQL Express is running, it will be used.
#Ef core sql server connection string update
The NuGet package will then update the configuration file by setting the default database server that Code First uses when creating a connection by convention. During installation, the EntityFramework NuGet package checks which database server is available. Visual Studio 2010 includes SQL Express by default and Visual Studio 2012 and later includes LocalDB. In this example DbContext uses the namespace qualified name of your derived context class-Demo.EF.BloggingContext-as the database name and creates a connection string for this database using either SQL Express or LocalDB. C# will call base class parameterless constructor by default If you have not done any other configuration in your application, then calling the parameterless constructor on DbContext will cause DbContext to run in Code First mode with a database connection created by convention. Use Code First with connection by convention The following fragments show some of the ways the DbContext constructors can be used.
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Models created with Code First and the EF Designer are both covered in this topic. This topic covers how Entity Framework discovers which database connection to use, and how you can change it.