C#通過執行sql語句的方式執行存儲過程，得到輸出參數

一般情況下我們是這樣執行存儲過程的，下面方式也可以獲取返回值

 public static DataTable ExecuteStoredPro(string storeName, out int resultcount, string title, int pageindex, int pagesize)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.CommandText = storeName;
                    SqlParameter[] para ={
                                     new SqlParameter("@title",SqlDbType.Int),
                                     new SqlParameter("@pageindex",SqlDbType.Int),
                                     new SqlParameter("@pagesize",SqlDbType.Int),
                                     new SqlParameter("@result_value",SqlDbType.Int)

            };

                    para[0].Value = title;
                    para[1].Value = pageindex;
                    para[2].Value = pagesize;
                    para[3].Direction = ParameterDirection.Output; //設定參數的輸出方向  

                    cmd.Parameters.AddRange(para);// 將參數加入命令對象  
                    SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                    DataTable dt = new DataTable();
                    adapter.Fill(dt);

                    resultcount = Convert.ToInt32(cmd.Parameters[3].Value);


                    return dt; 
                   

                }
            }

        }

但是在一些情況下，我們不能像上面直接通過存儲過程名執行存儲過程，我們可以像執行sql語句一樣執行存儲過程，這樣獲取返回值也有些區別，如下

 public string FileApprove(FileApproveMetadata data)
        {
            SqlParameter para = new SqlParameter() { ParameterName = "@error",DbType= DbType.String, Size=500};
            para.Direction = ParameterDirection.Output;//這個必須加，sql語句中的output也要加

            SqlParameter[] param = { new SqlParameter() { ParameterName= "@projectId", Value=data.ProjectId },
                new SqlParameter() { ParameterName = "@taskId", Value = data.TaskId },
                new SqlParameter() { ParameterName = "@subTaskId", Value = data.SubTaskId },
                new SqlParameter() { ParameterName = "@create_EmpId", Value = data.Create_EmpId },
                new SqlParameter() { ParameterName = "@fileIds", Value = data.FileIds },
                new SqlParameter() { ParameterName = "@fileapprovers", Value = data.Fileapprovers },
                new SqlParameter() { ParameterName = "@remark", Value = data.Remark },para};
           
           //直接寫執行語句
            CurrentRepository.ExecuteSql(@"exec [proc_Flow_AddFileApprove] @projectId,@taskId,@subTaskId,@create_EmpId,@fileIds,
            @fileapprovers,@remark,@error output", param);


            return para.Value.ToString();
        }