c# - 将数据类型 nvarchar 转换为 int 时出错 - 执行存储过程时

Question

我有一个执行创建、编辑、删除和读取操作的存储过程。

ALTER PROCEDURE [dbo].[CURDOpSP]    
@operation varchar(50), 
@regid int = 0,
@fname varchar(50) = null,
@lname varchar(50) = null,
@phone varchar(50) = null,
@email varchar(50) = null

AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for procedure here
if(@operation = 'Insert')
BEGIN
    insert into Register(fname,lname,phone,email,status)values(@fname,@lname,@phone,@email,0);
END

else if(@operation = 'Select')
BEGIN
    select * from Register where status = 0;
END

else if(@operation = 'Edit')
BEGIN
    update Register set fname= @fname, lname = @lname, phone = @phone, email = @email where RegisterId = @regid;
    
END

else if(@operation = 'Delete')
BEGIN
    Update Register set status = 1 where RegisterId = @regid;
END
END

我已经在 Controller 上调用了这个过程。

// GET: /Employee/Create
public ActionResult Create()
{
    return View();
}

// POST: /Employee/Create
[HttpPost]
public ActionResult Create(Register register)
{           
    if (ModelState.IsValid)
    {
        db.Database.ExecuteSqlCommand("dbo.CURDOpSP @p0, @p1, @p2, @p3, @p4", "Insert", register.fname, register.lname, register.phone, register.email);
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(register);   
}   
    
// POST: /Employee/Delete/5        
public ActionResult Delete(int id)
{
    Register register = db.Registers.Find(id);
    if (register == null)
    {
        return HttpNotFound();
    }           
    db.Database.ExecuteSqlCommand("dbo.CURDOpSP @p0, @p1", "Delete",register.RegisterId); 
            
    db.SaveChanges();
    return RedirectToAction("Index");
}

当我尝试创建新记录时，出现此错误:

Error converting data type nvarchar to int.

Source Error:

Line 40: if (ModelState.IsValid)

Line 41: {

Line 42: db.Database.ExecuteSqlCommand("dbo.CURDOpSP @p0, @p1, @p2, @p3, @p4", "Insert", register.fname, register.lname, register.phone, register.email);

Line 43: db.SaveChanges();

Line 44: return RedirectToAction("Index");

其他三个操作正常。

如果我将参数@regid 放在存储过程中，在参数声明的末尾，例如:

ALTER PROCEDURE [dbo].[CURDOpSP]    
@operation varchar(50),     
@fname varchar(50) = null,
@lname varchar(50) = null,
@phone varchar(50) = null,
@email varchar(50) = null,
@regid int = 0

然后创建就可以了。但是现在删除功能将不起作用。

Answer 1

在这样的Delete方法中调用时，还需要传递其他参数。我想参数 @regid 就像你最后发布的那样结束了。

db.Database.ExecuteSqlCommand("dbo.CURDOpSP @p0, @p1,@p2,@p3@,@p4,@p5", "Delete","","","","",register.RegisterId);