Entity Framework Core: Log queries for a single db context instance

Question

Using EF Core (or any ORM for that matter) I want to keep track of the number of queries the ORM makes to the database during some operation in my software.

I\'ve us

Answer 1

You can use a bounded context. I used EF Coed first to create two different contexts

Customer bounded context will not log any queries

public class CustomerModelDataContext : DbContext
{
    public DbSet Customers { get; set; }

    public DbSet PostalCodes { get; set; }

    public CustomerModelDataContext()
        : base("ConnectionName")
    {
        Configuration.LazyLoadingEnabled = true;
        Configuration.ProxyCreationEnabled = true;
        Database.SetInitializer(new Initializer());
        //Database.Log = message => DBLog.WriteLine(message);
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

API bounded context will log the queries

public class ApiModelDataContext : DbContext
{
    public DbSet ApiTokens { get; set; }

    public DbSet ApiClients { get; set; }

    public DbSet ApiApplications { get; set; }

    public ApiModelDataContext() 
        : base("ConnectionName")
    {
        Configuration.LazyLoadingEnabled = true;
        Configuration.ProxyCreationEnabled = true;
        Database.SetInitializer(new Initializer());
        Database.Log = message => DBLog.WriteLine(message);
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

this will log the query to debug output window in VS

public static class DBLog
{
    public static void WriteLine(string message)
    {
        Debug.WriteLine(message);
    }
}