I'm building a multi-tenant MVC app where there's a single app pool and single database. I have a Tenant table, and each of my models has a TenantId identified. 

Each Tenant has a string "Url" that identifies the full URL used to access that tenant's data. 

I can access this from my BaseController with the following (rough approximation): 

```
HttpRequest request = HttpContext.Current.Request;
Uri requestUrl = request.Url;
_tenant = _tenantService.GetTenantByUrl(requestUrl);

```

Now, I'm at a point where I need to pass the Tenant into the service layer to perform business logic. One way I can do this is to go across every single method across all services (~200 methods) and add a Tenant parameter. I'd have to touch every *call* to the service layer, and every service layer *method*. This would work, but it's tedious and muddles the code.

For example, one of my methods before: 

```
    public void DeleteUserById(int userId)
    {
        using (var db = CreateContext())
        {
            var user = db.Users.FirstOrDefault(u => u.UserId.Equals(userId));
            InternalDeleteUser(db, user);
        }
    }

```

After (if I pass in the Tenant):

```
    public void DeleteUserById(Tenant tenant, int userId)
    {
        using (var db = CreateContext())
        {
            var user = tenant.Users.FirstOrDefault(u => u.UserId.Equals(userId));
            InternalDeleteUser(db, user);
        }
    }

```

What I'm trying to achieve (by setting the tenant from my BaseController, one layer up):

```
    public void DeleteUserById(int userId)
    {
        using (var db = CreateContext())
        {
            var user = _tenant.Users.FirstOrDefault(u => u.UserId.Equals(userId));
            InternalDeleteUser(db, user);
        }
    }

```

Is there any way I can use my BaseService (all other services inherit from this) or some other pattern to define the Tenant from the Controller, and have the service methods pick it up, without passing it as a parameter to each one? This way I need only touch the base controller (or maybe even global.asax), and nothing else.

Put simply: **How can I make an object accessible to all services by defining it from an MVC controller, without passing it directly to the service?**