解决“The type initializer for'Oracle.DataAccess.Client.OracleConnection' threw an exception ”异常

问题：部署在安装oracle client 11g，运行后出现如下问题：

*****************Exception Text*************** System.TypeInitializationException: The type initlializer for 'Oracle.DataAccess.Client.OracleConnection at Oracle.DataAccess.Client.OracleConnection..cctor() --- End of inner exception stack trace --- at Oracle.DataAccess.Client.OracleConnection..ctor(String connectionString) ...

从oracle 网站下载  ODAC1120320Xcopy_32bit ：

http://www.oracle.com/technetwork/database/windows/downloads/utilsoft-087491.html

Reference: Oracle.DataAccess.dll(ODAC1120320Xcopy_32bitodp.net4odp.netin4Oracle.DataAccess.dll)

复制如下dll 到你程序的bin目录中:

• oci.dll (ODAC1120320Xcopy_32bitinstantclient_11_2oci.dll)
• oraociei11.dll (ODAC1120320Xcopy_32bitinstantclient_11_2oraociei11.dll)
• OraOps11w.dll (ODAC1120320Xcopy_32bitodp.net4inOraOps11w.dll)