System.TypeInitializationException: The type initializer for 'Oracle.DataAccess.Client.OracleConnection' threw an exception. ---> Oracle.DataAccess.Client.OracleException: 提供程序与此版本的 Oracle 客户机不兼容”

.net应用程序通过Oracle.DataAccess.dll访问64位的Oracle服务器，在连接时出现以下异常：“System.TypeInitializationException: The type initializer for 'Oracle.DataAccess.Client.OracleConnection' threw an exception. ---> Oracle.DataAccess.Client.OracleException: 提供程序与此版本的 Oracle 客户机不兼容”

oracle 在C# 中调用oracle的数据库时，出现引用库和当前客户端不兼容的问题解决方案

解决方案

1、直接引用  Oracle.ManagedDataAccess.Client.dll动态库即可，

2、引用  Oracle.DataAccess.Client.dll动态库，但根目录下面要有这八个动态库才可以正常使用Oracle 数据库，

（引用 Oracle.DataAccess.Client，但是使用Oracle.DataAccess.dll时，其生成根目录下要有这八个dll（Oracle.ManagedDataAccess这个库相当于后面八个库（oci，ociw32，orannzsbb11，oraocci11，oraociei11，oraons，OraOps11w，OWC11八个动态库））才可以使用11g oracle数据库）

下面是代码：

//using Oracle.DataAccess.Client;
using Oracle.DataAccess.Client;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//using System.Data.OracleClient;
//using Oracle.ManagedDataAccess.Client;

namespace MyTest
{
class Program
{
static void Main(string[] args)
{

#region 引用 Oracle.ManagedDataAccess.Client

//OracleConnection con = null;
//try
//{
// //string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL)));User Id=taizhou;Password=taizhou";
// //11g ORACLE
// //string connString = "Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.144)(PORT = 1521))(CONNECT_DATA = (SID = orcl))); User Id = evms; Password = evms; Pooling = true; Min Pool Size = 10; Max Pool Size = 100; Connection Lifetime = 120; Connection Timeout = 60; Incr Pool Size = 5; Decr Pool Size = 2;";
// //10g ORACLE
// string connString = "Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.158)(PORT = 1521))(CONNECT_DATA = (SID = ORCL))); User Id = evms; Password = evms; Pooling = true; Min Pool Size = 10; Max Pool Size = 100; Connection Lifetime = 120; Connection Timeout = 60; Incr Pool Size = 5; Decr Pool Size = 2; ";
// //string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=130.147.246.144)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ECMS)));Persist Security Info=True;User ID=system;Password=Service01;";
// con = new Oracle.ManagedDataAccess.Client.OracleConnection(connString);

// con.Open();

// ////SELECT* FROM TAIZHOU."UserInfo"
// //string connstring = @"Data Source=TAIZHOU;User ID=taizhou;Password=taizhou;";
// ////实例化OracleConnection对象
// //OracleConnection conn = new OracleConnection(connstring);
// ////打开连接
// //conn.Open();

// StringBuilder stringBuilder = new StringBuilder();
// Oracle.ManagedDataAccess.Client.OracleCommand oracleCommand = new Oracle.ManagedDataAccess.Client.OracleCommand("SELECT * FROM EVMS.USERINFO", con);
// var ss = oracleCommand.ExecuteReader();
// while (ss.Read())
// {
// string name = ss.GetOracleString(3).ToString();
// stringBuilder.AppendLine(name);
// }
// Console.WriteLine(stringBuilder.ToString());
// ss.Close();
// Console.Read();
//}
//catch (Exception ex)
//{
// Console.WriteLine("11111111111111");
//}
//finally
//{
// con.Close();
//}
#endregion

#region 引用 Oracle.DataAccess.Client，但是使用Oracle.DataAccess.dll时，其生成根目录下要有这八个dll（Oracle.ManagedDataAccess这个库相当于后面八个库（oci，ociw32，orannzsbb11，oraocci11，oraociei11，oraons，OraOps11w，OWC11八个动态库））才可以使用11g oracle数据库

OracleConnection con = null;
try
{
//string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL)));User Id=taizhou;Password=taizhou";
//string connString = "Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.144)(PORT = 1521))(CONNECT_DATA = (SID = orcl))); User Id = fcms; Password = fcms; Pooling = true; Min Pool Size = 10; Max Pool Size = 100; Connection Lifetime = 120; Connection Timeout = 60; Incr Pool Size = 5; Decr Pool Size = 2;";
string connString = "Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.144)(PORT = 1521))(CONNECT_DATA = (SID = ORCL))); User Id = evms; Password = evms; Pooling = true; Min Pool Size = 10; Max Pool Size = 100; Connection Lifetime = 120; Connection Timeout = 60; Incr Pool Size = 5; Decr Pool Size = 2; ";

//string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=130.147.246.144)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ECMS)));Persist Security Info=True;User ID=system;Password=Service01;";
con = new OracleConnection(connString);

con.Open();

////SELECT* FROM TAIZHOU."UserInfo"
//string connstring = @"Data Source=TAIZHOU;User ID=taizhou;Password=taizhou;";
////实例化OracleConnection对象
//OracleConnection conn = new OracleConnection(connstring);
////打开连接
//conn.Open();

StringBuilder stringBuilder = new StringBuilder();
OracleCommand oracleCommand = new OracleCommand("SELECT * FROM evms.USERINFO", con);
var ss = oracleCommand.ExecuteReader();
while (ss.Read())
{
string name = ss.GetOracleString(3).ToString();
stringBuilder.AppendLine(name);
}
Console.WriteLine(stringBuilder.ToString());
ss.Close();
Console.Read();
}
catch (Exception ex)
{
Console.WriteLine("11111111111111");
}
finally
{
con.Close();
}
#endregion
}
}
}