如何在运行时修改 sql 连接字符串？

Question

我查询数据库如下：

string connString = "Data Source=ServerName;Initial Catalog=AdventureWorks;User 
     id=UserName;Password=Secret;";    
SqlConnection conn = new SqlConnection();
SqlCommand cmd = new SqlCommand("select * from Orders", connString);
conn.Open();

问题是服务器可能需要设置 TrustServerCertificate 和 Encrypt

因此，如果我运行上面的代码，它将因错误而失败

  SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the login process. 
  (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)]

但如果我有 connString 作为

"Data Source=ServerName;Initial Catalog=AdventureWorks;User 
 id=UserName;Password=Secret;Encrypt=true;TrustServerCertificate=true");

然后它将毫无问题地连接并且选择将运行。

所以我可能需要即时更改连接字符串 有没有一种聪明的方法可以修改上面的代码，以检查是否返回错误，然后使用修改后的新连接字符串重试选择？

Answer 1

将您的代码放入 try 块并捕获 SqlException。然后，更改您的 SqlCommand 连接字符串并重试连接。

    string connString = "Data Source=ServerName;Initial Catalog=AdventureWorks;Userid=UserName;Password=Secret;";    
    SqlConnection conn = new SqlConnection();
    SqlCommand cmd = new SqlCommand("select * from Orders", connString);
    try
    {
       conn.Open();
    }
    catch (SqlException ex)
    {
       cmd.ConnectionString = "Data Source=ServerName;Initial Catalog=AdventureWorks;Userid=UserName;Password=Secret;Encrypt=true;TrustServerCertificate=true";
       conn.Open()
    }
    catch (Exception ex)
    {
       Console.Write($"Error: {ex.Message}")
    }