Question

This may be a basic question, but is System.Data.SqlClient Specific to SQL Server Only?

I would like to use the System.Data.SqlClient.SortOrder as a method parameter to my repository interface IRepository.Find(), but don’t want to use a SQL Server specific argument.
Is there a vendor-neutral version of the SortOrder enum?

For now, I am just using a string parameter called sortOrder which just takes the value “asc” or “desc” or just create my own enum.

Here is the implementation of the method in question:

public ICollection<T> Find(Expression<Func<T, bool>> predicate, int pageNumber, int size, Expression<Func<T, object>> orderBy, string sortOrder, out int count, params Expression<Func<T, object>>[] fetchSelectors)
{
    count = (this.DbSet as IQueryable<T>).Count(predicate);

    if (size < 1 || size > count)
    {
        throw new ArgumentOutOfRangeException("size");
    }

    var maxPageNumber = (count + size - 1) / size;
    if (pageNumber < 1 || pageNumber > maxPageNumber)
    {
        throw new ArgumentOutOfRangeException("pageNumber");
    }
    if (sortOrder != "asc" && sortOrder != "desc")
    {
        throw new ArgumentException("sortOrder");
    }

    var skipCount = pageNumber * size;
    var query = BuildQuery(predicate, fetchSelectors);
    query = sortOrder == "asc" ? query.OrderBy(orderBy) : query.OrderByDescending(orderBy);
    return query.Skip(skipCount).Take(size).ToList();
}

Answer 1

From MSDN, yes this is SQL Server specific.

The System.Data.SqlClient namespace is the.NET Framework Data Provider
for SQL Server.

Collation will likely be provider-specific, although the semantics (ASC/DESC) are common.