代碼：

SqlParameter[] commandParameters = new SqlParameter[]{new SqlParameter("@CultID",filters.ParentID)};var result = db.Database.SqlQuery<FM_PlantSolutions>(@"select s.* ,u.UserName as PrincipalName,isnull(ue.UserName,'無') as ExaminerName ,i.BaseName AS InputsTypeNamefrom [v_PlantSolutionsRelation] as rinner join dbo.FM_Solutions as s on r.SoluID = s.SoluIDinner join dbo.U_UserInfo as u on s.Principal= u.UserIDleft join dbo.U_UserInfo as ue on s.Examiner = ue.UserID inner join dbo.B_BaseInfo as i on s.InputsType=i.BaseValuewhere r.CultID = CultID and i.ClassID = 21 ", commandParameters);var q= result.OrderBy(t => t.SoluName).Skip((filters.page - 1) * filters.rows).Take(filters.rows);return new {rows = q.ToList(),records = result.Count(),page = filters.page,pagesize = filters.rows};

　　

查詢報表的時候需要通過兩次查詢取出數據。

第一次，用count(*)查出總數；第二次，用rownumber分頁取出想要的頁內容；

然而，無論怎么修改，總是報錯：另一個 SqlParameterCollection 中已包含 SqlParameter。
參照了網友的做法：https://www.cnblogs.com/jhli/p/6898650.html

但是并沒有解決問題，分析報錯的原理，大概是這段代碼執行了兩次，傳入了兩次同樣的參數，所以索性將.ToList()往前放，直接將所有數據加載到內存中，再進行分頁，問題解決了，修改后的代碼 SqlParameter[] commandParameters = new SqlParameter[]{new SqlParameter("@CultID",filters.ParentID)};var result = db.Database.SqlQuery<FM_PlantSolutions>(@"select s.* ,u.UserName as PrincipalName,isnull(ue.UserName,'無') as ExaminerName ,i.BaseName AS InputsTypeNamefrom [v_PlantSolutionsRelation] as rinner join dbo.FM_Solutions as s on r.SoluID = s.SoluIDinner join dbo.U_UserInfo as u on s.Principal= u.UserIDleft join dbo.U_UserInfo as ue on s.Examiner = ue.UserID inner join dbo.B_BaseInfo as i on s.InputsType=i.BaseValuewhere r.CultID = CultID and i.ClassID = 21 ", commandParameters).ToList();var q= result.OrderBy(t => t.SoluName).Skip((filters.page - 1) * filters.rows).Take(filters.rows);return new {rows = q,records = result.Count(),page = filters.page,pagesize = filters.rows};}

?

轉載于:https://www.cnblogs.com/bamboo-zhang/p/9546745.html

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