在.NETCore3.0 + EFCore中的Oracle连接串的Data Source如果直接用TNS NAME会报“ORA-12154: TNS:could not resolve the connect identifier specified”

//eg:

optionsBuilder.UseOracle(@"User Id=<USER>;Password=<PASSWORD>;Data Source=<TNS NAME>") ;
假设上述TNS NAME=ORCL

//解决办法是上面代码前追加：
方案1：直接设置TnsAdmin路径

// Set TnsAdmin value to directory location of tnsnames.ora and sqlnet.ora files
OracleConfiguration.TnsAdmin = @"<DIRECTORY LOCATION>";

方案2：单独设置Tns Name（两种方式）

// Add data source through Add method on OracleDataSourceCollection
OracleConfiguration.OracleDataSources.Add("ORCL", "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<hostname>)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=<service name>)(SERVER=dedicated)))");

// Add data source through indexer method on OracleDataSourceCollection
OracleConfiguration.OracleDataSources["ORCL"] = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<hostname>)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=<service name>)(SERVER=dedicated)))";