c# - 将数据从文本框存储到 appconfig

Question

我有文本框，我在其中选择 path for .txt，其中保存和编码数据对于 SqlConnection:

 Stream myStream = null;
        OpenFileDialog openFileDialog1 = new OpenFileDialog();

        openFileDialog1.InitialDirectory = "c:\\";
        openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        openFileDialog1.FilterIndex = 2;
        openFileDialog1.RestoreDirectory = true;

        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            try
            {
                if ((myStream = openFileDialog1.OpenFile()) != null)
                {
                    using (myStream)
                    {
                        // Insert code to read the stream here.
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
            }
            textBox5.Text = string.Format("{0}", openFileDialog1.FileName) ;

            // here I need some miracle to save default text for textBox5, appconfig maybe? according to which path was selected
            nacti_spojeni();
        }

但问题是用户每次想要连接到 SQL 数据库时都必须选择路径，我认为如果可能的话，可以将路径保存到应用程序配置中吗？我想到的其他事情是为文本框设置默认文本值。也许这是一个微不足道且毫无意义的问题。谢谢大家的宝贵时间。

Answer 1

您可以使用从 txt 框中传递的路径值更新配置文件，如下所示，

注意:当您在 visual studio 中以 Debug模式测试此方法时，您将仅看到 AppConfig.vshost.exe.config 将使用传递的值进行更新。

private static void UpdateConnectionString(string path)
{
        Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        configuration.AppSettings.Settings["ConfigurationKeyForPath"].Value = path;

        //Save only the modified section of the config
        configuration.Save(ConfigurationSaveMode.Modified);

        //Refresh the appSettings section to reflect updated configurations
        ConfigurationManager.RefreshSection("appSettings");           
}