來自finally塊內的異常

Question

請考慮下面的代碼，其中LockDevice（）可能會失敗並在自身上拋出異常。如果在finally塊中引發異常，那麼在C＃中會發生什麼？

 
UnlockDevice(); 

try 
{ 
    DoSomethingWithDevice(); 
} 
finally 
{ 
    LockDevice(); // can fail with an exception 
} 

Answer 1

完全相同的事情，如果它不是在一個finally塊中會發生 - 一個異常可能從這個點傳播。如果需要，你可以內最後的try/catch來自：

try 
{ 
    DoSomethingWithDevice(); 
} 
finally 
{ 
    try 
    { 
     LockDevice(); 
    } 
    catch (...) 
    { 
     ... 
    } 
} 

Answer 2

的方法被稱爲的try/catch

哪裏是你的收穫？

UnlockDevice(); 

try 
{ 
    DoSomethingWithDevice(); 
} 
catch(Exception ex) 
{ 
    // Do something with the error on DoSomethingWithDevice() 
} 
finally 
{ 
    try 
    { 
     LockDevice(); // can fail with an exception 
    } 
    catch (Exception ex) 
    { 
     // Do something with the error on LockDevice() 
    } 
}