Activation error occured while trying to get instance of type Database key

 配置默认连接 <dataConfiguration defaultDatabase="Database Connection String"> 
否则就必须传递参数进去  Database db = DatabaseFactory.CreateDatabase(strConString);

 <add name="Database Connection String" connectionString="Data Source=DEVRAC;Persist Security Info=True;User ID=USER;Password=PWD"
            providerName="Oracle.DataAccess.Client" />

 <add name="Database Connection String" connectionString="Data Source=DEVRAC;Persist Security Info=True;User ID=NCS;Password=NCS"
            providerName="System.Data.OracleClient" />  

我用的微软的Oracle类库 不是Oracle提供的 因此必须用下边的连接串。我遇到的问题是这个样子。

其他的地方看看 data common serviceLocation  引用到项目试试

Activation error occured while trying to get instance of type Database key

原文：http://www.cnblogs.com/hbhzz/p/3992403.html