如何在没有复制/粘贴代码块的情况下重用逻辑-C＃

Question

My project reuses the code below multiple times with only a few variables changing. I've noted the values that change with eg ***value***.

  if (comboBox1.Text == ***"Most recent first"***)
            {
                string dgvconn = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\n0740572\Projects\CW\CW\bin\Debug\Database1.mdf;Integrated Security=True";
                string sql = "select * from Records where UserID = @userID Order By ***Date Desc***";
                SqlConnection connection = new SqlConnection(dgvconn);
                SqlDataAdapter dataadapter = new SqlDataAdapter(sql, connection);
                dataadapter.SelectCommand.Parameters.AddWithValue("@userID", currentUserID);
                DataSet ds = new DataSet();
                connection.Open();
                dataadapter.Fill(ds, "Records");
                connection.Close();
                recordsDataGridView.DataSource = ds;
                recordsDataGridView.DataMember = "Records";
            }

How can I use this same logic, with different values, without copying and pasting the if statement multiple times?

Answer 1

Sounds to me you want something like:

private void foo(string matchText, string sortBy) {
    if (comboBox1.Text == matchText)
    {
        string dgvconn = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\n0740572\Projects\CW\CW\bin\Debug\Database1.mdf;Integrated Security=True";
        string sql = "select * from Records where UserID = @userID Order By " + sortBy;
        SqlConnection connection = new SqlConnection(dgvconn);
        SqlDataAdapter dataadapter = new SqlDataAdapter(sql, connection);
        dataadapter.SelectCommand.Parameters.AddWithValue("@userID", currentUserID);
        DataSet ds = new DataSet();
        connection.Open();
        dataadapter.Fill(ds, "Records");
        connection.Close();
        recordsDataGridView.DataSource = ds;
        recordsDataGridView.DataMember = "Records";
    }     
}//foo

//Call the method
foo("Most recent first", "Date DESC");
foo("Most recent last", "Date");
foo("By Username", "User");