Force DataSourceLoader to load data before it is returned from a controller's action

[ilyapavlovdx]

// GET
using (var db = new MyDbContext())
{
    return this.Request.CreateResponse(DataSourceLoader.Load(db.Table0, loadOptions));
}

This code throws ObjectDisposedException because the MyDbContext instance is disposed of before the inner query is executed.

Related:

• https://devexpress.com/issue=T720659

[AlekseyMartynov]

Workarounds: #359 (comment)