使用&；try/catch嵌套

这个问题更像是一个做某事的正确方法。。。

问题。。。在using块和try/catch块之间是否存在适当的嵌套顺序？

将整个using语句嵌套在try/catch中并保持using块的优点可以吗？（或者异常是否会导致using语句的关闭部分被抛出窗口）

还是应该将try/catch嵌套在using语句中，并且只围绕执行数据库访问的语句？

是。。。

try {
     using( tsmtcowebEntities db = new tsmtcowebEntities() ) {
          violationList = ( from a in db.DriverTrafficViolationDetails
                            where a.DriverTrafficViolation.DriverApplicationId == DriverAppId
                            orderby a.DateOfOccurance descending
                            select a ).ToList<DriverTrafficViolationDetail>();
          GeneralViolation = ( from a in db.DriverTrafficViolations
                               where a.DriverApplicationId == DriverAppId
                               select a ).FirstOrDefault();
     }
} catch { }

比…更不正确。。。

using( tsmtcowebEntities db = new tsmtcowebEntities() ) {
     try {
          violationList = ( from a in db.DriverTrafficViolationDetails
                            where a.DriverTrafficViolation.DriverApplicationId == DriverAppId
                            orderby a.DateOfOccurance descending
                            select a ).ToList<DriverTrafficViolationDetail>();
          GeneralViolation = ( from a in db.DriverTrafficViolations
                               where a.DriverApplicationId == DriverAppId
                               select a ).FirstOrDefault();
     } catch { }
}