组合框值c急剧变化

Question

如何使用包含数据库中特定列的所有值的组合框。我有一个名为StudentName的列，我希望有一个组合框，其中包含StudentName的所有值。

sql = new SqlConnection(@"Data Source=PC-PC\PC;Initial Catalog=Anbar;Integrated Security=True");
adapter = new SqlDataAdapter("select * from School", sql);

我该怎么办？请提供一些代码以继续这些代码，我们将不胜感激。

Answer 1

sqlCon = new SqlConnection(@"Data Source=PC-PC\PC;Initial Catalog=Anbar;Integrated Security=True");
  SqlDataAdapter da = new SqlDataAdapter("Select StudentName from School", sqlCon);
        DataTable dt = new DataTable();
        da.Fill(dt);
        yourComboBox.DataSource = dt;
        yourComboBox.DisplayMember = "StudentName";
        yourComboBox.ValueMember = "StudentName";

另请阅读此Populate Date from Database in a ComboBox

Answer 2

使用以下代码

SqlDataAdapter da = new SqlDataAdapter("Select StudentName from School", sqlCon);
DataTable dat = new DataTable();
da.Fill(dat);
cmb.DataSource = dat;
cmb.DisplayMember = "StudentName";
cmb.ValueMember = "StudentName";