C# 中的 Inheritance 和 generics

Question

I have the following base repository:

public abstract class BaseRepository<TEntity, TContext> : IBaseRepository<TEntity>
    where TEntity : class
    where TContext : ApplicationDbContext
{
    // save, add, ...
}

Where IBaseRepository contains the basic CRUD operations.

My ApplicationDbContext is:

public class ApplicationDbContext : IdentityDbContext<IdentityUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
    
    // entities here
}

And finally, AuditableIdentityContext is used for auditing some tables:

public abstract class AuditableIdentityContext : ApplicationDbContext
{
    public AuditableIdentityContext(DbContextOptions<ApplicationDbContext> options) : base(options)
    {
    }

    public virtual async Task<int> SaveChangesAsync(string userId)
    {
        // writing to audit log here
        OnBeforeSaveChanges(userId);
        var result = await base.SaveChangesAsync();
        return result;
    }

From the repository, I can't access the auditable save method:

public class MyRepo : BaseRepository<MyEntity, AuditableIdentityContext>, IMyRepo 
{
    public MyRepo(AuditableIdentityContext context) : base(context)
    {
    }
}

Now

_myRepo.SaveChangesAsync("123"); // not found

Why I can't access the inherited method from the child class?

Answer 1

public abstract class BaseRepository<TEntity, TContext> : IBaseRepository<TEntity>
    where TEntity : class
    where TContext : ApplicationDbContext
{
    protected readonly TContext _dbContext;

    protected BaseRepository(TContext dbContext)
    {
        _dbContext = dbContext;
    }
}    

public class MyRepo : BaseRepository<MyEntity, AuditableIdentityContext>, IMyRepo 
{
    public MyRepo(AuditableIdentityContext context) : base(context)
    {
    }

    public async Task<int> SaveChangesAsync(string userId)
    {
           return await _dbContext.SaveChangesAsync(userId);
    }
 }