试图通过控制器从 DAL 传递列表

Question

我试图通过控制器从 DAL 传递一个列表，我在数据表中收集了 SQL-数据，所以我试图将数据表更改为控制器中的列表，但是没有成功。

这是我的 DAL 方法：

public DataTable findAllUsers()
{
    string queryText = "SELECT UserNbr FROM Users";

    cmd = new SqlCommand(queryText, con);

    con.Open();

    da = new SqlDataAdapter(cmd);
    dt = new DataTable();
    da.Fill(dt);
    con.Close();

    return dt;
}

这是我的控制器：

public List<User> allUsers ()
{
    List<User> allUsers = DAL.findAllUsers.ToList();
}

Answer 1

我认为你需要这样的东西：

// This is a class that represents a row of your DataTable.
public class User
{
    public int UserNbr { get; set;}
    public User(int userNbr)
    {
        UserNbr = userNbr;
    }
}

public List<User> allUsers ()
{
    var users = new List<User>();

    // Create an instance of the DAL class.
    var dal = new Restaurang4.DAL();

    // Loop through the datatable's rows and create foreach of them 
    // a new User and then add it to the users list.
    foreach(var dataRow in dal.findAllUsers().Rows)
        users.Add(new User(dataRow.Field<int>("UserNbr ")));

    return users;
}

试图通过控制器从 DAL 传递列表

Trying to pass a list from DAL through Controller

c#

model-view-controller