{“參數化查詢'（@Usr_Name nvarchar（4000）…nv'期望參數'@Usr_Name'，未提供。”}

Question

我收到此異常，這是我用於在db中創建用戶詳細信息的插入代碼。 我想盡力解決，但無法解決

public ActionResult Create(UserModel usr)
{
    con.Open();
    string query = "Insert into Tbl_User Values(@Usr_Name,@FirstName,@LastName,@Gender,@Phone,@Address,@Email)";
    SqlCommand cmd = new SqlCommand(query, con);
    SqlParameter usrname = cmd.Parameters.AddWithValue("@Usr_Name", usr.Usr_Name);
    if (usr.Usr_Name == null)
    {
        usrname.Value = DBNull.Value;
    }
    SqlParameter fname = cmd.Parameters.AddWithValue("@FirstName", usr.First_Name);
    if (usr.First_Name == null)
    {
        fname.Value = DBNull.Value;
    }
    cmd.Parameters.AddWithValue("@LastName", usr.Last_Name);
    cmd.Parameters.AddWithValue("@Gender", usr.Gender);
    cmd.Parameters.AddWithValue("@Phone", usr.Phone);
    cmd.Parameters.AddWithValue("@Address", usr.Address);
    cmd.Parameters.AddWithValue("@Email", usr.Email);
    cmd.ExecuteNonQuery();

    return RedirectToAction("Index");
}

Answer 1

Comment :  // Problem in your query. Please write Actual DB Field Name of 
your SQL in below line.

public ActionResult Create(UserModel usr)
{
    con.Open();
    Comment :  // Problem in your query. Please write Actual DB Field Name 
                  of your SQL in below line.

 string query = "Insert into Tbl_User 
(Field1,Field2,Field3,Field4,Field5,Field6,Field7) 
Values(@Usr_Name,@FirstName,@LastName,@Gender,@Phone,@Address,@Email)";
     SqlCommand cmd = new SqlCommand(query, con);
     SqlParameter usrname = cmd.Parameters.AddWithValue("@Usr_Name", 
     usr.Usr_Name);
if (usr.Usr_Name == null)
{
    usrname.Value = DBNull.Value;
}
SqlParameter fname = cmd.Parameters.AddWithValue("@FirstName", usr.First_Name);
if (usr.First_Name == null)
{
    fname.Value = DBNull.Value;
}
cmd.Parameters.AddWithValue("@LastName", usr.Last_Name);
cmd.Parameters.AddWithValue("@Gender", usr.Gender);
cmd.Parameters.AddWithValue("@Phone", usr.Phone);
cmd.Parameters.AddWithValue("@Address", usr.Address);
cmd.Parameters.AddWithValue("@Email", usr.Email);
cmd.ExecuteNonQuery();

return RedirectToAction("Index");
 }