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How to create a generic method with optional generic parameter in c# ?

Anonymous User 1084 29-Jun-2019

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c# c#  asp.net mvc  mvc 
Updated on 02-Jul-2019
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A_Philosopher

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1 Answers

Anonymous User

Anonymous User

02-Jul-2019

Try to use overloaded method. 

public void ExecuteList<T>(out List<T> obj, string sql, params object[] parameters) where T : class

        {

            var db = _context;

            var cmd = db.Database.Connection.CreateCommand();

            cmd.CommandText = sql;

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Parameters.AddRange(parameters);

            try

            {

                db.Database.Connection.Open();

                using (var reder = cmd.ExecuteReader())

                {

                    obj = ((IObjectContextAdapter)db).ObjectContext.Translate<T>(reder).ToList();



                }

            }

            finally

            {

                db.Database.Connection.Close();

                cmd.Dispose();

            }



        }

        /// <summary>

        /// 

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <typeparam name="T1"></typeparam>

        /// <param name="obj"></param>

        /// <param name="obj1"></param>

        /// <param name="sql"></param>

        /// <param name="parameters"></param>

        public void ExecuteList<T, T1>(out List<T> obj, out List<T1> obj1, string sql, params object[] parameters) where T : class

        {

            var db = _context;

            var cmd = db.Database.Connection.CreateCommand();

            cmd.CommandText = sql;

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Parameters.AddRange(parameters);

            try

            {

                db.Database.Connection.Open();

                using (var reder = cmd.ExecuteReader())

                {

                    obj = ((IObjectContextAdapter)db).ObjectContext.Translate<T>(reder).ToList();

                    reder.NextResult();

                    obj1 = ((IObjectContextAdapter)db).ObjectContext.Translate<T1>(reder).ToList();

                }

            }

            finally

            {

                db.Database.Connection.Close();

                cmd.Dispose();

            }



        }


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