填充組合框

Question

我的場景是從數據庫填充組合框，顯示客戶名稱，並使用標識增量保存id的值。

當此代碼運行時，我收到一個錯誤Procedure or function 'spSelectCustomerById' expects parameter '@id', which was not supplied。

SqlConnection conn = new SqlConnection(connectionString); 
conn.Open(); 

//SelectCustomerById(int x); 
comboBoxEx1.Items.Clear(); 

SqlCommand comm = new SqlCommand("spSelectCustomerByID", conn); 
//comm.Parameters.Add(new SqlParameter("cust_name", cust_name)); 
//comm.CommandText = "spSelectCustomerByID"; 
comm.Parameters.Add(new SqlParameter("cust_id", SqlDbType.Int)); 
comm.CommandType = CommandType.StoredProcedure; 
comm.ExecuteNonQuery(); 

SqlDataAdapter sdap = new SqlDataAdapter(comm); 
DataSet dset = new DataSet(); 
sdap.Fill(dset, "cust_registrations"); 

if (dset.Tables["cust_registrations"].Rows.Count > 0) 
{ 
    comboBoxEx1.Items.Add("cust_registrations").ToString(); 
} 
comboBoxEx1.DataSource = dset; 
comboBoxEx1.DisplayMember = "cust_name"; 

如何從數據庫填充組合框？

Answer 1

對於網絡的ComboBox我們comboBoxEx1.DataValueField = "cust_id";

爲WPF你贏形式使用comboBoxEx1.SelectedValuePath = "cust_id";

使用comboBox1.ValueMember = "cust_id";

Answer 2

conn.Open(); 

     //SelectCustomerById(int x); 
     comboBoxEx1.Items.Clear(); 
     SqlCommand comm = new SqlCommand("spSelectCustomerByID", conn); 
     //comm.Parameters.Add(new SqlParameter("cust_name", cust_name)); 
     //comm.CommandText = "spSelectCustomerByID"; 
     comm.Parameters.Add(new SqlParameter("@id", SqlDbType.Int)); 
     comm.CommandType = CommandType.StoredProcedure; 
     comm.ExecuteNonQuery(); 
     SqlDataAdapter sdap = new SqlDataAdapter(comm); 
     DataSet dset = new DataSet(); 
     sdap.Fill(dset, "cust_registrations");   
     comboBoxEx1.DataSource = dset; 
     comboBoxEx1.DisplayMember = "cust_name"; 

//添加以下行 //你並不需要添加項目進入組合框。

 comboBoxEx1.ValueMember = "cust_id"; 
     comboBoxEx1.DataBind();