Asp.NET C# MVC - 如何使用多个表显示查询结果

Question

I'm executing the following code:

public ActionResult BranchUser(int ? idBranch)
        {
            CtrForm objCtrForm = new CtrForm();
            objCtrForm.Connect();
            objCtrForm.query.Connection = objCtrForm.connection;
            objCtrForm.query.CommandType = CommandType.Text;
            List<tblUser> listBranchUser = new List<tblUser>();
            string sql = @"SELECT B.name, B.phone, B.email, B.idUser FROM tblBranchUser A
                           INNER JOIN tblUsers B ON A.idUser = B.idUser
                           WHERE A.idBranch = " + idBranch;
            objCtrForm.query.CommandText = sql;
            objCtrForm.connection.Open();
            SqlDataReader sReader = objCtrForm.query.ExecuteReader();            
            while (sReader.Read())
            {
                listBranchUser.Add(
                    new tblUser
                    {
                        idUser = Convert.ToInt32(sReader["idUser"]),
                        name = Convert.ToString(sReader["name"]),
                        phone = Convert.ToString(sReader["phone"]),
                        email = Convert.ToString(sReader["email"])
                    }
                    );
            }
            objCtrForm.connection.Close();
            return View(listBranchUser);
        }

but I got the following error when I call the function:

System.Data.SqlClient.SqlException: 'Incorrect syntax near '='.'

I don't understand why I get this, due to I executed in other functions but I only called one table, not two. Any advice I will appreciate.

Answer 1

I believe C# won't implicitly convert an integer to a string.

Try replacing

string sql = @"SELECT B.name, B.phone, B.email, B.idUser FROM tblBranchUser A
                           INNER JOIN tblUsers B ON A.idUser = B.idUser
                           WHERE A.idBranch = " + idBranch;

With

string sql = @"SELECT B.name, B.phone, B.email, B.idUser FROM tblBranchUser A
                           INNER JOIN tblUsers B ON A.idUser = B.idUser
                           WHERE A.idBranch = " + idBranch.ToString();