How to intercept and modify SQL query in Linq to SQL

Question

I was wondering if there is any way to intercept and modify the sql generated from linq to Sql before the query is sent off?

Basically, we have a record security layer,

Answer 1

first thing come to my mind is to modify the query and return the result in Non-LINQ format

//Get linq-query as datatable-schema
        public DataTable ToDataTable(System.Data.Linq.DataContext ctx, object query)
        {
            if (query == null)
            {
                throw new ArgumentNullException("query");
            }

            IDbCommand cmd = ctx.GetCommand((IQueryable)query);
            System.Data.SqlClient.SqlDataAdapter adapter = new System.Data.SqlClient.SqlDataAdapter();
            adapter.SelectCommand = (System.Data.SqlClient.SqlCommand)cmd;
            DataTable dt = new DataTable("sd");

            try
            {
                cmd.Connection.Open();
                adapter.FillSchema(dt, SchemaType.Source);
                adapter.Fill(dt);
            }
            finally
            {
                cmd.Connection.Close();
            }
            return dt;
        }

try to add your condition to the selectCommand and see if it helps.