我如何从 2 个不同的表中填充 2 个组合框？

Question

我需要从 2 个不同的表中填充 2 个组合框。这种方式不行。

private void client_Load(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection();
    con.ConnectionString = "Data Source=.;Initial Catalog=SCP_DB;Integrated Security=True";
    con.Open();
    string query = "select  Operation_Type from Operations_Types";
    SqlDataAdapter da = new SqlDataAdapter(query, con);
    DataSet ds = new DataSet();
    da.Fill(ds, "Operations_Types");
    comboOpType.DisplayMember = "Operation_Type";
    comboOpType.ValueMember = "Operation_Type";
    comboOpType.DataSource = ds.Tables["Operations_Types"];

    da.Fill(ds, "Payment_Type");
    comboPayType.DisplayMember = "Payment_Types";
    comboPayType.ValueMember = "Payment_Types";
    comboPayType.DataSource = ds.Tables["Payment_Type"];
    SqlCommand cmd = new SqlCommand(query, con);
    cmd.ExecuteNonQuery();
    con.Close();
}

Answer 1

您应该在 sql 实例中调用每个 table 并使用 TableMappings

像这样更改您的代码。

private void client_Load(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection();
    con.ConnectionString = "Data Source=.;Initial Catalog=SCP_DB;Integrated Security=True";
    con.Open();
    string query = "select  Operation_Type from Operations_Types; select ? from Payment_Type";
    SqlDataAdapter da = new SqlDataAdapter(query, con);
    da.TableMappings.Add("Table", "Operations_Types");
    da.TableMappings.Add("Table1", "Payment_Type");
    DataSet ds = new DataSet();
    da.Fill(ds, "Table");
    comboOpType.DisplayMember = "Operation_Type";
    comboOpType.ValueMember = "Operation_Type";
    comboOpType.DataSource = ds.Tables["Operations_Types"];

    da.Fill(ds, "Table1");
    comboPayType.DisplayMember = "Payment_Types";
    comboPayType.ValueMember = "Payment_Types";
    comboPayType.DataSource = ds.Tables["Payment_Type"];
    SqlCommand cmd = new SqlCommand(query, con);
    cmd.ExecuteNonQuery();
    con.Close();
}

我如何从 2 个不同的表中填充 2 个组合框？

how i fill 2 comboboxs from 2 different tables?

c#

sql

ado.net