读取注册表根据Office版本获取数据库连接字段

/// <summary> 
/// 读取注册表，根据office版本获取数据库连接字段 
/// </summary> 
/// <returns>数据库连接字段</returns> 
private string getconnectionstring() 
{ 
  string strconnectionstring = "provider=microsoft.jet.oledb.4.0;data source = "; 
 
  registrykey rk = registry.localmachine; 
  //查询office2003 
  registrykey f03 = rk.opensubkey(@"software\microsoft\office\11.0\access\installroot\"); 
  //查询office2007 
  registrykey f07 = rk.opensubkey(@"software\microsoft\office\12.0\access\installroot\"); 
  //查询office2010 
  registrykey f10 = rk.opensubkey(@"software\microsoft\office\14.0\access\installroot\"); 
 
  if (f03 != null) 
  { 
    strconnectionstring = "provider=microsoft.jet.oledb.4.0;data source = "; 
  } 
  else if (f07 != null || f10 != null) 
  { 
    strconnectionstring = "provider=microsoft.ace.oledb.12.0;data source = "; 
  } 
 
  return strconnectionstring; 
}