如何在组合框中检索所选项目的主键？ [英] How can I retrieve the primary key of the selected item in a combobox?

问题描述

 SqlDataAdapter adapter2 =  new  SqlDataAdapter（  SELECT * FROM dbo.OrderLines，cn）; 
 
 adapter2.InsertCommand =  new  SqlCommand（  dbo.InsertOrderLine，cn）; 
 adapter2.InsertCommand.CommandType = CommandType.StoredProcedure; 
 
 adapter2.InsertCommand.Parameters.Add（ new  SqlParameter（  @ ServiceProviderID，SqlDbType.Int， 15 ，  ServiceProviderID））; 
 adapter2.InsertCommand.Parameters.Add（ new  SqlParameter（  @ ProductID，SqlDbType.Int， 15 ， 产品ID））; 
 adapter2.InsertCommand.Parameters.Add（ new  SqlParameter（  @ PolicyNumber，SqlDbType.NVarChar， 50 ，  PolicyNumber））; 
 
 SqlParameter parameter2 = adapter.InsertCommand.Parameters.Add（  @ ID2，SqlDbType.Int， 0 ，  OrderLineID< /跨度>）; 
 parameter2.Direction = ParameterDirection.Output; 
 
 DataTable orderline =  new  DataTable（）; 
 adapter.Fill（orderline）; 
 
  //  从Products表中查找productComboBox.SelectedItem的主键 
  //  和来自ServiceProviders表的serviceProviderCombobox.SelectedItem  
 DataRow newRow2 = orderline.NewRow （）; 
 newRow2 [  ServiceProviderID] =？serviceProviderComboBox.SelectedItem？; 
 newRow2 [  ProductID] =？productComboBox.SelectedItem？; 
 newRow2 [  PolicyNumber] = policyTextBox.Text; 
 orderline.Rows.Add（newRow2）; 
 
 adapter.Update（orderline）; 
 
 id2 =  int  .Parse（parameter2.Value.ToString（））; 

解决方案

意识到SelectedValue已包含主键。将它分配给变量。



添加以下两行：



int spid = int.Parse（serviceProviderComboBox .SelectedValue.ToString（））;

int pid = int.Parse（productComboBox.SelectedValue.ToString（））;

你必须编写一个选择查询返回主键



query =从表中选择combobox.selectedvalue（或选定文本）。（yourtable name）

其中primarykey = XY或其他

SqlDataAdapter adapter2 = new SqlDataAdapter("SELECT * FROM dbo.OrderLines", cn);

adapter2.InsertCommand = new SqlCommand("dbo.InsertOrderLine", cn);
adapter2.InsertCommand.CommandType = CommandType.StoredProcedure;

adapter2.InsertCommand.Parameters.Add(new SqlParameter("@ServiceProviderID", SqlDbType.Int, 15, "ServiceProviderID"));
adapter2.InsertCommand.Parameters.Add(new SqlParameter("@ProductID", SqlDbType.Int, 15, "ProductID"));
adapter2.InsertCommand.Parameters.Add(new SqlParameter("@PolicyNumber", SqlDbType.NVarChar, 50, "PolicyNumber"));

SqlParameter parameter2 = adapter.InsertCommand.Parameters.Add("@ID2", SqlDbType.Int, 0, "OrderLineID");
parameter2.Direction = ParameterDirection.Output;

DataTable orderline = new DataTable();
adapter.Fill(orderline);

// find primary key of both productComboBox.SelectedItem from Products table
// and serviceProviderCombobox.SelectedItem from ServiceProviders table
DataRow newRow2 = orderline.NewRow();
newRow2["ServiceProviderID"] = ?serviceProviderComboBox.SelectedItem?;
newRow2["ProductID"] = ?productComboBox.SelectedItem?;
newRow2["PolicyNumber"] = policyTextBox.Text;
orderline.Rows.Add(newRow2);

adapter.Update(orderline);

id2 = int.Parse(parameter2.Value.ToString());

解决方案

Realised that the "SelectedValue" already contained the primary key. Assigned it to variables.

Added these two lines:

int spid = int.Parse(serviceProviderComboBox.SelectedValue.ToString());
int pid = int.Parse(productComboBox.SelectedValue.ToString());

you must write a select query that return primary key

query= select combobox.selectedvalue(or selected text) from table.(yourtable name)
where primarykey= X Y or else

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