C＃WPF - 我怎樣才能獲得上市項目（組合框）

Question

private void Window_Loaded(object sender, RoutedEventArgs e) 
    { 
     try 
     { 
      SqlConnection con = new SqlConnection(@"Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=SARManagement;Data Source=AIZAZ\SQLEXPRESS"); 
      con.Open(); 
      string query = "Select Semester,ID FROM Batch"; 
      SqlCommand da = con.CreateCommand(); 
      da.CommandText = query; 
      SqlDataAdapter adapter = new SqlDataAdapter(da); 
      DataSet ds = new DataSet(); 
      adapter.Fill(ds, "Batch"); 
      Semester.ItemsSource = ds.Tables[0].DefaultView; 
      Semester.DisplayMemberPath = ds.Tables[0].Columns["Semester"].ToString(); 
      Semester.SelectedValuePath = ds.Tables[0].Columns["ID"].ToString(); 

     } 
     catch (Exception ex) 
     { 
      MessageBox.Show("" + ex); 
     }   
    } 
private void Semester_SelectionChanged(object sender, SelectionChangedEventArgs e) 
    { 
     here how can i get combobox items.. that are listed in combobox as displaymemberpath 
    } 

如何獲取這是從數據庫中檢索作爲組合框的DisplayMemberPath ...物品或分享另一種方式來檢索數據和插入數據作爲一個ListBoxItem

Answer 1

DisplayMemberPath和SelectedValuePath應該只有一個帶有相應列名稱的字符串。試試這個：

private void Window_Loaded(object sender, RoutedEventArgs e) 
{ 
    try 
    { 
     SqlConnection con = new SqlConnection(@"Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=SARManagement;Data Source=AIZAZ\SQLEXPRESS"); 
     con.Open(); 
     string query = "Select Semester,ID FROM Batch"; 
     SqlCommand da = con.CreateCommand(); 
     da.CommandText = query; 
     SqlDataAdapter adapter = new SqlDataAdapter(da); 
     DataSet ds = new DataSet(); 
     adapter.Fill(ds, "Batch"); 
     Semester.ItemsSource = ds.Tables[0].DefaultView; 
     Semester.DisplayMemberPath = "Semester"; 
     Semester.SelectedValuePath = "ID"; 

    } 
    catch (Exception ex) 
    { 
     MessageBox.Show("" + ex); 
    }   
} 

private void Semester_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    DataRowView data = (DataRowView)Semester.SelectedItem; 
    string selstr = data["Semester"].ToString(); 
    int sel = (int)data["ID"]; 
    MessageBox.Show("ID: " + sel + " Value: " + selstr); 
}