ASP.NET MVC - 存储过程执行返回无效对象

Posted 2023-02-15

【中文标题】ASP.NET MVC - 存储过程执行返回无效对象

【英文标题】：ASP.NET MVC - stored procedure execution returns invalid object

【发布时间】：2022-01-16 19:42:42

【问题描述】：

我正在开发一个 ASP.NET MVC Web 应用程序，当我尝试通过 .ExecuteReader() 执行存储过程时，我收到“无效对象”错误。我是新手，所以我不确定如何纠正它。我试图研究它，但无法找到答案。

请看下面我的代码。

internal class CostCtrDAO

    private string connectionString = @"Data Source=DESKTOP-54N4IDK\SQLSERVER2019;Initial Catalog=""Ceiling Database New"";Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";

    //public string Cost_Center_Name  get; private set; 

    //internal List<CeilingByCostCtr> FetchAll()
    //
    //  throw new NotImplementedException();
    //

    //performs all operations on the database - get all, create, delete, get one, search

    public List<CeilingByCostCtr> FetchAll()
    
        //if (CostCtr is null)
        //
        //    throw new ArgumentNullException(nameof(CostCtr));
        //

        List<CeilingByCostCtr> returnList = new List<CeilingByCostCtr>();

        // Access the database
        using (SqlConnection connection = new SqlConnection(connectionString))
        
            string sqlQuery = "SELECT * FROM dbo.uspGetCostCtrByParam";

            SqlCommand command = new SqlCommand(sqlQuery, connection);
            //command.CommandType = System.Data.CommandType.StoredProcedure;

            // Associate @CostCtr with parameter CostCtr
            // command.Parameters.AddWithValue("@CostCtr", System.Data.SqlDbType.NVarChar).Value = CostCtr;

            connection.Open();
            SqlDataReader reader = command.ExecuteReader();

            CeilingByCostCtr ceilingByCostCtr = new CeilingByCostCtr();

            if (reader.HasRows)
            
                while (reader.Read())
                
                    ceilingByCostCtr.CostCtr = reader.GetString(0);
                    ceilingByCostCtr.Cost_Center_Name = reader.GetString(1);
                    ceilingByCostCtr.BR = reader.GetString(2);
                    ceilingByCostCtr.Branch_Name = reader.GetString(3);
                    ceilingByCostCtr.Division = reader.GetString(4);
                    ceilingByCostCtr.Division_Name = reader.GetString(5);
                    ceilingByCostCtr.New = reader.GetString(6);
                    ceilingByCostCtr.Date = reader.GetString(7);
                    ceilingByCostCtr.Type = reader.GetString(8);
                    ceilingByCostCtr.Ref2 = reader.GetString(9);
                    ceilingByCostCtr.Proj_Code = reader.GetString(10);
                    ceilingByCostCtr.Proj_Name = reader.GetString(11);
                    ceilingByCostCtr.Act_Code = reader.GetString(12);
                    ceilingByCostCtr.Act_Name = reader.GetString(13);
                    ceilingByCostCtr.B_or_O = reader.GetString(14);
                    ceilingByCostCtr.Jul = reader.GetString(15);
                    ceilingByCostCtr.Aug = reader.GetString(16);
                    ceilingByCostCtr.Sep = reader.GetString(17);
                    ceilingByCostCtr.Oct = reader.GetString(18);
                    ceilingByCostCtr.Nov = reader.GetString(19);
                    ceilingByCostCtr.Dec = reader.GetString(20);
                    ceilingByCostCtr.Jan = reader.GetString(21);
                    ceilingByCostCtr.Feb = reader.GetString(22);
                    ceilingByCostCtr.Mar = reader.GetString(23);
                    ceilingByCostCtr.Apr = reader.GetString(24);
                    ceilingByCostCtr.May = reader.GetString(25);
                    ceilingByCostCtr.Jun = reader.GetString(26);
                    ceilingByCostCtr.Perm = reader.GetString(27);
                    ceilingByCostCtr.Temp = reader.GetString(28);
                    ceilingByCostCtr.LimitedTerm = reader.GetString(29);
                    ceilingByCostCtr.Monthly = reader.GetDecimal(30);
                    ceilingByCostCtr.Analyst = reader.GetString(31);
                    ceilingByCostCtr.AvgPYs = reader.GetDecimal(32);
                    ceilingByCostCtr.CalcPEs = reader.GetDecimal(33);
                    ceilingByCostCtr.Sal_Rate = reader.GetDecimal(34);
                    ceilingByCostCtr.Auth = reader.GetDecimal(35);
                    ceilingByCostCtr.Dollar_Adj = reader.GetDecimal(36);
                    ceilingByCostCtr.Budget = reader.GetDecimal(37);
                    ceilingByCostCtr.Mo_Rate = reader.GetDecimal(38);
                    ceilingByCostCtr.Import = reader.GetString(39);
                    ceilingByCostCtr.BudgetYear = reader.GetInt32(40);
                    ceilingByCostCtr.OngoingStatus = reader.GetString(41);
                    ceilingByCostCtr.OneTimeEndingDate = reader.GetInt32(42);
                    ceilingByCostCtr.Fund = reader.GetString(43);
                    ceilingByCostCtr.Program = reader.GetString(44);
                    ceilingByCostCtr.Element = reader.GetString(45);

                    returnList.Add(ceilingByCostCtr);
                
            

            return returnList;
        
    

【问题讨论】：

您必须验证用于连接数据库的凭据是否可以看到存储的过程，并且您的名称正确。您发布的代码中也没有任何内容可以说明问题所在。

奇怪的是，即使它没有参数，您也不能从函数中进行这样的选择，但是您会收到不同的错误Parameters were not supplied for the function ''.

【参考方案1】：

如果dbo.uspGetCostCtrByParam 确实是您数据库中的存储过程，那么您应该像这样访问它：

// Access the database
using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand command = new SqlCommand("dbo.uspGetCostCtrByParam", connection))

    command.CommandType = CommandType.StoredProcedure;
    ....
    // possibly setting parameters here??
    ....
    connection.Open();

    using (SqlDataReader reader = command.ExecuteReader())
    
        // now iterate over the rows returned and get what you need
    

您不能运行SELECT * FROM 来获取存储过程的结果...