c# - 使用 & try/catch 嵌套

Question

这个问题更多的是什么是做某事的正确方法...

问题...using block 和 try/catch 之间是否有正确的嵌套顺序？

是否可以将整个 using 语句嵌套在 try/catch 中并保持 using block 的优势？ (或者异常会导致 using 语句的结束部分被抛出窗口)

或者您是否应该将 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 { }
}

Answer 1

越晚越好:它将避免屏蔽最终抛出 dy dispose 的异常。看这个article.