发生错误后如何使try / catch继续工作？

Question

解析器代码可用

try

{

   id_source = await ParsingAll(0, "#adv_id", "");   

   foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src");

   position = await ParsingAll(0, "div.title.adv-title.newTitle > h1", "");

catch (Exception ex)

{

    Error?.Invoke(id_source + "- Error - ");    

}   

如果字符串“foto_path”出现错误怎么办，然后处理try/catch错误后，程序继续工作，开始执行字符串“position”？

Answer 1

一种方法是try catch在您的ParseAll方法中添加：ParsingAll(){   try   {   }   catch(Exception e)   {   }}您可以正常调用它们：id_source = await ParsingAll(0, "#adv_id", "");   foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src");position = await ParsingAll(0, "div.title.adv-title.newTitle > h1", "");并返回一些带有结果的状态以判断它是否成功。或者您需要将它们分别包装起来，以便在该语句失败时执行下一条语句：try{    foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src");}catch(Exception e){}position = await ParsingAll(0, "div.title.adv-title.newTitle > h1", "");但这一切都取决于程序要求流程将如何进行。

Answer 2

您可以缩小 try-catch 块：解析器代码可用// May need its own try-catch blcokid_source = await ParsingAll(0, "#adv_id", "");try{       foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src");catch (Exception ex){    Error?.Invoke(id_source + "- Error - ");    }// May need its own try-catch blcokposition = await ParsingAll(0, "div.title.adv-title.newTitle > h1", "");

Answer 3

这样做的唯一方法是将行拆分为单独的try...catch子句：try{   id_source = await ParsingAll(0, "#adv_id", "");   catch (Exception ex){    Error?.Invoke(id_source + "- Error - ");    }try{   foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src"); catch (Exception ex){    Error?.Invoke(id_source + "- Error - ");    }…

Answer 4

您可以考虑在 async ParsingAll 方法中捕获错误并仅返回该方法的有效输出。

Answer 5

从例程中获取 foto_path 值，而不是 Try catch 或将 try catch 放入 ParsingAll 例程中。

Answer 6

使用 finally 块如何，无论是否发生异常，它都将始终执行。我认为这更像是一种解决方法，但最好的解决方案应该是根据您的情况在 ParsingAll() 方法中处理它。try{   id_source = await ParsingAll(0, "#adv_id", "");      foto_path = await ParsingAll(1, "img[id='print_user_photo']", "src");}catch (Exception ex){    Error?.Invoke(id_source + "- Error - ");    }finally{    position = await ParsingAll(0, "div.title.adv-title.newTitle > h1", "");}