最有效的方法来测试SQL连接字符串的可用性

Question

我有这个代码,我试图让它测试SQL字符串连接,但我不知道如何处理该部分connection.Open = true你能帮我解决这个问题吗？非常感谢您的参与.

  private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            using (SqlConnection connection = new SqlConnection("Data Source='" + textBox1.Text + "';Initial Catalog='" + textBox2.Text + "';User ID='" + textBox3.Text + "';Password='" + textBox4.Text + "'"))
            {
                try
                {
                    connection.Open();
                    if (connection.Open == true) // if connection.Open was successful
                    {
                        MessageBox.Show("You have been successfully connected to the database!");
                    }
                    else
                    {
                        MessageBox.Show("Connection failed.");
                    }
                }
                catch (SqlException) { }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Chyba v p?ihlášení: " + ex);
        }
        finally
        {

        }
    }

它说:"不能'开放',因为它是'一个'组织''我知道这个代码可能完全不好,但我需要以某种方式处理它,并且不知道什么是正确的方法.谢谢.

这实际上不适用于未打开的连接:

using (SqlConnection connection = new SqlConnection("Data Source='" + textBox1.Text + "';Initial Catalog='" + textBox2.Text + "';User ID='" + textBox3.Text + "';Password='" + textBox4.Text + "'"))
        {

             connection.Open();

            if (connection.State == ConnectionState.Open)
            {

                MessageBox.Show("Spojení s databázi probl?hlo úsp?šn?.");
            }
            connection.Close();
            if (connection.State == ConnectionState.Closed)
            {
                MessageBox.Show("Spojení selhalo");
            }
        }

Answer 1

你正在使用connection.Open = true它就好像它是一个财产.

这是一种方法: connection.Open()

使用ConnectionState枚举来确定连接是否打开,例如:

connection.State == ConnectionState.Open