尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行，将出现此问题。

　　注意：Path 中设置的 路径一定要放在oracle 的路径前面, 记得修改 instantclient_11_2 文件夹E:\app\instantclient_11_2\network\ADMIN\tnsnames.ora 文件里面的配置信息

tnsnames.ora 文件：

 1 # TNSNAMES.ORA Network Configuration File: C:\oracle\ora90\network\admin\tnsnames.ora
 2 # Generated by Oracle configuration tools.
 3 
 4 #sample
 5 
 6 #DATABASENAME =
 7 #  (DESCRIPTION =
 8 #    (ADDRESS_LIST =
 9 #      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
10 #    )
11 #    (CONNECT_DATA =
12 #      (SERVICE_NAME = servicename)
13 #    )
14 #  )
15 
16 orcl=
17   (DESCRIPTION =
18     (ADDRESS_LIST =
19       (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT =1521))
20     )
21     (CONNECT_DATA =
22       (SERVICE_NAME =orcl)
23     )
24   )

测试代码如下：　　

 1     public class SqlHelper
 2     {
 3         private static string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["connStr"].ToString();
 4         public static DataTable Query(string sql)
 5         {
 6             DataTable dt = new DataTable();
 7             using (OracleConnection conn = new OracleConnection(connStr))
 8             {
 9                 conn.Open();
10                 OracleCommand cmd = new OracleCommand(sql,conn);
11                 OracleDataAdapter adapter = new OracleDataAdapter(cmd);
12                 adapter.Fill(dt);
13                 return dt;
14             }
15         }
16     }

配置文件 config

 1 <configuration>
 2   <connectionStrings>
 3     <add name="connStr" connectionString="Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)
　　　　　　(HOST = localhost)(PORT =1521)))(CONNECT_DATA =(SERVICE_NAME =orcl)));user=***; password=******;
　　　　　　persist security info=false;Min Pool Size=10;Max Pool Size=100;Pooling=true;" />
　　　　<!--<add name="connStr" connectionString="Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)
　　　　　　(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=orcl)));User Id=***;Password=***;"/>-->
 4   </connectionStrings>
 5     <system.web>
 6       <compilation debug="true" targetFramework="4.5" />
 7       <httpRuntime targetFramework="4.5" />
 8     </system.web>
 9 
10 </configuration>

尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行，将出现此问题。

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