Log Queries executed by Entity Framework DbContext

Question

I\'m using EF 6.0 with LINQ in MVC 5 project. I want to log all the SQL queries executed by the Entity Framework DbContext for debugging/performance-measurement purpose.

Answer 1

EF Core logging automatically integrates with the logging mechanisms of .NET Core. Example how it can be used to log to console:

public class SchoolContext : DbContext
{
    //static LoggerFactory object
    public static readonly ILoggerFactory loggerFactory = new LoggerFactory(new[] {
              new ConsoleLoggerProvider((_, __) => true, true)
        });

    //or
    // public static readonly ILoggerFactory loggerFactory  = new LoggerFactory().AddConsole((_,___) => true);

    public SchoolContext():base()
    {

    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseLoggerFactory(loggerFactory)  //tie-up DbContext with LoggerFactory object
            .EnableSensitiveDataLogging()  
            .UseSqlServer(@"Server=.\SQLEXPRESS;Database=SchoolDB;Trusted_Connection=True;");
    }

    public DbSet Students { get; set; }
}

If you would like to log to output window use this instead:

public static readonly ILoggerFactory loggerFactory = new LoggerFactory(new[] {
      new DebugLoggerProvider()
});

https://www.entityframeworktutorial.net/efcore/logging-in-entityframework-core.aspx