我想在数据库中的项目中显示我的组合框中的数据。我用了这段代码:
Connect con = new Connect();
combox1.DataSource = con.executeSelect("SELECT itemNames FROM MsBook");
我使用了这段代码,但它没有用。我创建了一个名为Connect`类的类。这是代码:
class Connect
{
SqlConnection con;
public Connect()
{
String connectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=" + Application.StartupPath + @"\Database1.mdf;Integrated Security=True;User Instance=True";
con = new SqlConnection(connectionString);
}
public DataTable executeSelect(String query)
{
con.Open();
SqlDataAdapter adapter = new SqlDataAdapter(query, con);
DataTable dt = new DataTable();
adapter.Fill(dt);
con.Close();
return dt;
}
public void execute(String query)
{
con.Open();
SqlCommand cmd = new SqlCommand(query, con);
cmd.ExecuteNonQuery();
con.Close();
}
}
你能告诉我这件事的例子吗?
THX
答案 0 :(得分:0)
您必须在设计器或代码中将列值分配给组合框。在ComboBox的属性中,将itemNames放在DisplayMember和ValueMember中,或者在如下代码中执行:
Connect con = new Connect();
combox1.DisplayMember = "itemNames";
combox1.ValueMember = "itemNames";
combox1.DataSource = con.executeSelect("SELECT itemNames FROM MsBook");