How find bin directory in ASP.NET Core 3.1?

Question

My EF project is in one project and my ASP.NET Core project in another project ,

D:\AspProjects\DatabaseHafez> <=== my ef model is in this folder

D:\AspProjects\Hafez> <=== my aspnet core 3 is in this folder

so each project has one bin folder.

The below builder(ConfigurationBuilder) should have the path of appsettings.json file for reading connections string.so the below has this path =>

D:\AspProjects\DatabaseHafez\bin\Debug\netcoreapp3.1\appsettings.json

but my appsettins.json file in my asp.net core project so after bulilding is will copy to output folder =>

D:\AspProjects\Hafez\bin\Debug\netcoreapp3.1\appsettings.json

so How can i find the output folder path?

public class AppDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
{
    AppDbContext IDesignTimeDbContextFactory<AppDbContext>.CreateDbContext(string[] args)
    {
        var builder = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

        IConfigurationRoot configuration = builder.Build();

        var optionsBuilder = new DbContextOptionsBuilder<AppDbContext>();

        optionsBuilder.UseSqlServer(configuration.GetConnectionString("DefaultConnection"));

        var context = new AppDbContext(optionsBuilder.Options);

        context.Database.EnsureCreated();
        return context;
    }
}

Now I want to add migrations But I get an error

D:\AspProjects\DatabaseHafez>dotnet ef migrations add changed98112601  

Build started...  
Build succeeded.  

System.IO.FileNotFoundException: The configuration file 'appsettings.json' was not found and is not optional. The physical path is 'D:\AspProjects\DatabaseHafez\bin\Debug\netcoreapp3.1\appsettings.json'.

at Microsoft.Extensions.Configuration.FileConfigurationProvider.HandleException(ExceptionDispatchInfo info)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load()
at Microsoft.Extensions.Configuration.ConfigurationRoot..ctor(IList1 providers)
at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
at DatabaseHafez.AppDbContextFactory.Microsoft.EntityFrameworkCore.Design.IDesignTimeDbContextFactory<DatabaseHafez.AppDbContext>.CreateDbContext(String[] args) in D:\AspProjects\DatabaseHafez\AppDbContextFactory.cs:line 27
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContextFromFactory(Type factory)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass13_1.<FindContextTypes>b__9()
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func1 factory)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)

The configuration file 'appsettings.json' was not found and is not optional. The physical path is 'D:\AspProjects\DatabaseHafez\bin\Debug\netcoreapp3.1\appsettings.json'.

Now I want to know how can I find the bin folder of my ASP.NET Core project?

Answer 1

Try to get it line this:

var runDir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) 

GetCurrentDirectory might also work, but there is this bug here: https://github.com/dotnet/project-system/issues/589 so I would avoid it.