How to connect to Oracle with C# using a LDAP/OID connection string

I found this SO post,

How do I query LDAP from C# to resolve Oracle TNS hostname while using managed ODP.NET?

Instead of just passing in a connection string that points to an LDAP server, I can do an LDAP query to get the db descriptor to build the connection string.

It's a 2 step process, so I probably want to cache the connection string once I build it. I normally count on connection pooling and "close" connections when I am done with them but this two step process seems like I have to manually add some caching of the connection string to avoid the overhead of hitting LDAP multiple times.

Is there a better way?

    string directoryServer = "oid.gtm.internal.mycompany.com:3060";
    string defaultAdminContext = "cn=OracleContext,dc=mycompany,dc=com";
    string serviceName = "mydb";
    string userId = "mylanid";
    string password = "mypwd";

    using (IDbConnection connection = GetConnection(directoryServer, defaultAdminContext, serviceName, userId, password))
    {
        connection.Open();

        connection.Close();
    }
    
private static IDbConnection GetConnection(string directoryServer, string defaultAdminContext,
                                           string serviceName, string userId, string password)
{
    string descriptor = ConnectionDescriptor(directoryServer, defaultAdminContext, serviceName);
    // Connect to Oracle
    string connectionString = $"user id={userId};password={password};data source={descriptor}";
    OracleConnection con = new OracleConnection(connectionString);
    return con;
}

private static string ConnectionDescriptor(string directoryServer, string defaultAdminContext,
    string serviceName)
{
    string ldapAdress = $"LDAP://{directoryServer}/{defaultAdminContext}";
    string query = $"(&(objectclass=orclNetService)(cn={serviceName}))";
    string orclnetdescstring = "orclnetdescstring";

    DirectoryEntry directoryEntry = new DirectoryEntry(ldapAdress, null, null, AuthenticationTypes.Anonymous);
    DirectorySearcher directorySearcher = new DirectorySearcher(directoryEntry, query, new[] { orclnetdescstring },
        SearchScope.Subtree);

    SearchResult searchResult = directorySearcher.FindOne();
    byte[] value = searchResult.Properties[orclnetdescstring][0] as byte[];

    if (value != null)
    {
        string descriptor = Encoding.Default.GetString(value);
        return descriptor;
    }

    throw new Exception("Error querying LDAP");
}