问题
I'm trying to update my Entity data model from the database. Earlier today, I ran my app just fine and was able to access the database, as I have a tnsnames.ora file that I copied and pasted into my project folder. Then, when i was trying to open my edmx file, I was getting a message along the lines of:
"The ADO.NET provider 'Oracle.ManagedDataAccess.Client' is either not registered in the machine or application config file, or could not be loaded"
I noticed that my machine didn't have ODAC for Visual Studio installed. So I went ahead and did that. Now, I can open my edmx file just fine, but my wizard is failing to connect to the database:
"ORA-12154: TNS:could not resolve the connect identifier specified"
I don't think I've touched my tnsnames.ora file since this morning. What gives?
回答1:
Figured the problem out.
I had to copy the tnsnames.ora file over to where i installed Oracle/client_1/Network/Admin, AND get the sqlnet.ora file in that same location.
来源：https://stackoverflow.com/questions/41709041/cannot-update-entity-data-model-from-database-due-to-tns-error