Question

为什么C#运行后Combox绑定数据库后没有显示内容

private void Form5_Load(object sender, EventArgs e) { SqlConnection conn = new SqlConnection("server=PC\\SQLEXPRESS;Integrated Security=SSPI;database=超市物价管理信息系统"); conn.Open(); SqlCommand cmd = new SqlCommand("select 供货商编号 from supplier ", conn); SqlDataReader sdr = cmd.ExecuteReader(); while (sdr.Read()) { this.toolStripComboBox1.Items.Add(sdr["供货商编号".ToString ()]); } sdr.Close(); 运行后ComBox内容为空，这怎么回事

Answer 1

this.toolStripComboBox1.Items.Add((sdr["供货商编号".ToString ()]).ToString()); 试试 while (sdr.Read()) { ListItem li = new ListItem((sdr["供货商编号".ToString ()]).ToString()); this.DropDownList1.Items.Add(li); }