System.Reflection.TargetInvocationException: '調用的目標已拋出異常

Question

我正在使用實體框架和存儲過程以及水晶報告

我想獲取存儲過程並在水晶報告中查看它

但我收到這個錯誤

System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'

inner exception
NullReferenceException: Object reference not set to an instance of an object.

This exception was originally thrown at this call stack:
    CrystalDecisions.CrystalReports.Engine.Table.Fields.get()

這是存儲過程

USE [PayRoll]
GO
/****** Object:  StoredProcedure [dbo].[SR1]    Script Date: 12/09/2020 15:41:32 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER Procedure [dbo].[SR1]

As
BEGIN

SELECT         
                         EmployeeCode,EmployeeName,JopName,Date_Hiring,Nat_Salary
FROM            
                         Employee_List_Code_Name_Jop_DateHiring 
END 

這是調用存儲過程錯誤的代碼 rpt.SetDataSource(bs);

            if(Report_Number == "2")
            {
                var Employee_Data = db.Database.SqlQuery<Table>("EXEC SR1").ToList();
                bs.DataSource = Employee_Data;
            }
            //
            //
            //
            ReportDocument rpt = new ReportDocument();
            rpt.Load(Application.StartupPath + "\\Report\\Arabic\\" + "R" + Report_Number + ".rpt");

            rpt.SetDataSource(bs);

和這個存儲過程類

namespace PayRoll.database
{
    using System;
    
    public partial class SR1_Result
    {
        public int EmployeeCode { get; set; }
        public string EmployeeName { get; set; }
        public string JopName { get; set; }
        public System.DateTime Date_Hiring { get; set; }
        public double Nat_Salary { get; set; }
    }
}

如何修復此錯誤？

Answer 1

我在 sql 查詢中出錯

代替

查詢

SqlQuery<SR1_Result>

像這樣

if(Report_Number == "2")
            {
                var Employee_Data = db.Database.SqlQuery<SR1_Result>("SR1").ToList();
                bs.DataSource = Employee_Data;
            }