Control cannot fall through from one case label

Question

I am trying to write a switch statement that would type the search term in the search field depending on whichever search textbox is present  I have the following code  But I am getting a  quot Control cannot fall through from one case label quot  error  switch  searchType        case  quot SearchBooks quot           Selenium Type  quot      id  SearchBooks TextInput   quot   searchText           Selenium Click  quot      id  SearchBooks SearchBtn   quot         case  quot SearchAuthors quot           Selenium Type  quot      id  SearchAuthors TextInput   quot   searchText           Selenium Click  quot      id  SearchAuthors SearchBtn   quot        Control cannot fall through from one case label  case  quot SearchBooks quot    to another Control cannot fall through from one case label  case  quot SearchAuthors quot    to another

User · Accepted Answer

You missed some breaks there   switch  searchType        case  SearchBooks           Selenium Type       id  SearchBooks TextInput     searchText           Selenium Click       id  SearchBooks SearchBtn              break       case  SearchAuthors           Selenium Type       id  SearchAuthors TextInput     searchText           Selenium Click       id  SearchAuthors SearchBtn              break      Without them  the compiler thinks you re trying to execute the lines below case  SearchAuthors   immediately after the lines under case  SearchBooks   have been executed  which isn t allowed in C    By adding the break statements at the end of each case  the program exits each case after it s done  for whichever value of searchType

User · Answer

At the end of each switch case  just add the break-statement to resolve this problem switch  manu        case manufacturers Nokia           phanefact   new NokiaFactory            break       case manufacturers Samsung           phanefact   new SamsungFactory            break

User · Answer

You missed break statements  Don t forget to use break-statements even in the default case  switch  searchType        case  quot SearchBooks quot           Selenium Type  quot      id  SearchBooks TextInput   quot   searchText           Selenium Click  quot      id  SearchBooks SearchBtn   quot            break      case  quot SearchAuthors quot           Selenium Type  quot      id  SearchAuthors TextInput   quot   searchText           Selenium Click  quot      id  SearchAuthors SearchBtn   quot            break      default          Console WriteLine  quot Default case handling quot            break

User · Answer

using System  using System Collections Generic  using System Linq  using System Text   namespace Case example 1       class Program               static void Main string   args                        Char ch              Console WriteLine  Enter a character                ch  Convert ToChar Console ReadLine                 switch  ch                                case  a                   case  e                   case  i                   case  o                   case  u                   case  A                   case  E                   case  I                   case  O                   case  U                        Console WriteLine  Character is alphabet                        break                   default                      Console WriteLine  Character is constant                        break                              Console ReadLine

User · Answer

You need to add a break statement   switch  searchType    case  SearchBooks       Selenium Type       id  SearchBooks TextInput     searchText       Selenium Click       id  SearchBooks SearchBtn          break  case  SearchAuthors       Selenium Type       id  SearchAuthors TextInput     searchText       Selenium Click       id  SearchAuthors SearchBtn          break      This assumes that you want to either handle the SearchBooks case or the SearchAuthors - as you had written in  in a traditional C-style switch statement the control flow would have  fallen through  from one case statement to the next meaning that all 4 lines of code get executed in the case where searchType     SearchBooks    The compiler error you are seeing was introduced  at least in part  to warn the programmer of this potential error   As an alternative you could have thrown an error or returned from a method

User · Answer

You can do more than just fall through in C   but you must utilize the  dreaded  goto statement  For example   switch  whatever      case 2      Result Write   Subscribe         break    case 1      Result Write   Un         goto case 2

User · Answer

Since it wasn t mentioned in the other answers  I d like to add that if you want case SearchAuthors to be executed right after the first case  just like omitting the break in some other programming languages where that is allowed  you can simply use goto  switch  searchType        case  quot SearchBooks quot       Selenium Type  quot      id  SearchBooks TextInput   quot   searchText       Selenium Click  quot      id  SearchBooks SearchBtn   quot        goto case  quot SearchAuthors quot        case  quot SearchAuthors quot       Selenium Type  quot      id  SearchAuthors TextInput   quot   searchText       Selenium Click  quot      id  SearchAuthors SearchBtn   quot        break

User · Answer

You need to break   throw  goto  or return from each of your case labels   In a loop you may also continue           switch  searchType                        case  SearchBooks                   Selenium Type       id  SearchBooks TextInput     searchText                   Selenium Click       id  SearchBooks SearchBtn                      break               case  SearchAuthors                   Selenium Type       id  SearchAuthors TextInput     searchText                   Selenium Click       id  SearchAuthors SearchBtn                      break              The only time this isn t true is when the case labels are stacked like this    case  SearchBooks      no code inbetween case labels   case  SearchAuthors          handle both of these cases the same way      break

[c#] Control cannot fall through from one case label

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