OracleConnection.Open上的NullreferenceException

Question

I am trying to connect to an Oracle Database with C#. For that I am trying to use ODP.NET since I found out that this should be the best way to do it.

Sadly I am getting a NullReferenceException as soon as I try to open the connection.

Stack trace:

at Oracle.DataAccess.Client.OracleConnection.Open()

at odptest.MyAddin.Initialize() in C:\\ProgramData\\SRH Systems\\STARS\\Projects\\odptest\\MyAddin.cs:line 28

And this is my code:

using (OracleConnection conn = new OracleConnection())
{
    try
    {
        conn.ConnectionString = constr;
        conn.Open();
    }
    catch (Exception ex)
    {
    }
}

I am using the latest version of odp.net from here: http://www.oracle.com/technetwork/topics/dotnet/utilsoft-086879.html

I am realy confused, and even so I found some posts with the same problem, there was no solution offerd. I just need a simple SQL query from the DataBase and I don't know what the problem is.

Answer 1

If Login Id and Password is correct, re-start IIS. You might have re-started database service.

Answer 2

好的，我不知道我到底做了什么，但是我重新安装了Oracle Client 12c，现在按预期建立了连接。