錯誤顯示出來填充：SelectCommand.Connection屬性尚未初始化

Question

DataSet ds = new DataSet(); 

    SqlDataAdapter cmd = new SqlDataAdapter("Select * FROM event", con); 
    cmd.Fill(ds, "Table"); 

再次得到同樣的錯誤，並試圖再次一切

請幫助

Answer 1

編輯

嘗試這樣的，缺少元素在這可能是命令類型，它被添加在下面的代碼中，也打開連接數據庫

SqlConnection sqlcon; 
    using(sqlcon = new SqlConnection("Data Source=Servername;Initial 
     Catalog=Marketing;Integrated Security=SSPI")) 
    { 

     SqlCommand cmd = new SqlCommand("Select * FROM event", sqlcon); 
     cmd.CommandType = CommandType.Text; 
     sqlcon.Open(); 
     da = new SqlDataAdapter(sqlcmd); 
     da.Fill(dt); 
    } 

注意：使用然後處理所有使用語句。這也被添加上述

---

調用補法

SqlConnection conn= new 
     SqlConnection("Data Source=Servername;Initial Catalog=Marketing;Integrated Security=SSPI"); 

SqlDataAdapter cmd = new SqlDataAdapter("Select * FROM event", con); 
    cmd.Fill(ds, "Table"); 

Answer 2

SqlConnection myconn = new SqlConnection(YourConnString); 
SqlCommand mycmd = new SqlCommand(); 

try{ myconn.Open(); } 
catch (Exception ex) { MessageBox("Error");} 
mycmd.Connection = myconn; 

DataSet ds = new DataSet(); 
DataTable dt = new DataTable(); 

String sqlStr = "Select * FROM event"; 
SqlDataAdapter da = new SqlDataAdapter(sqlStr, myconn); 
da.Fill(ds); 
dt = ds.Tables[0];