Telerik OpenAccess为每个函数调用生成相同的查询

Question

I'm using a Generic Repository like pattern to fetch data. There are 100+ entities so creating a separate repository for each is not really an option. here are a few functions from the same class:

    public int Count(Func<TEntity, bool> x=null)
    {
        return x == null ?
            mgr.CTX.GetAll<TEntity>().Count() :
            mgr.CTX.GetAll<TEntity>().Where(x).Count();
    }

    public TEntity One(Func<TEntity, bool> x)
    {
        return mgr.CTX.GetAll<TEntity>().Where(x).Take(1).FirstOrDefault();
    }

    public IQueryable<TEntity> All(Func<TEntity, bool> x=null)
    {
        return x == null ?
            mgr.CTX.GetAll<TEntity>() :
            mgr.CTX.GetAll<TEntity>().Where(x).AsQueryable<TEntity>();
    }

The problem is no matter which function is call, the Sql profiler shows the same

Select [columns] from [table]

I suppose when using Take(1) or Count() or Where() the query should be made accordingly using Count() , Top or Where clauses of Select but these functions have absolutely no effects on query generation. Apparently, every operation seems to be performed in memory after fetching all the data from server.

Guide me if there is something wrong with the way I'm accessing it or this is the normal behavior of telerik?

Answer 1

I believe you are victim of a subtle difference between definitions of LINQ extension method - in-memory ones use Func<> while SQL-bound use Expression<> as parameter type.
My suggestion is to change All(Func<TEntity, bool> x=null) to All(Expression<Func<TEntity, bool>> x=null)