C#-如何将(Exception-ex)公开

如何在try-catch块之后使ex可访问？像这样。。。

try
{
    // do something...
}
catch (Exception ex) {
    // skip here...
}
//execute **ex** here

我为什么要这么做？如果我写：

try
{
    // do something...
    // i already declared x as public.
    x = "what ever";
}
catch (Exception ex) {
    // if there's an error...
    Console.WriteLine(ex);
}
// Even there's an error,
// there's still no output.

所以，如果前任是公开的，我可以试试这个：

try
{
    // do something...
}
catch (Exception ex) {
    // skip here...
}
// execute **ex** here

Exception ex = null;
try
{
    // do something...
}
catch (Exception ex1) {
    ex = ex1;
}
if(ex != null)
   // ...

Exception exceptionObject = null;
try
{
    // do something...
}
catch (Exception ex) {
    exceptionObject = ex;
}
// execute **ex** here
if(exceptionObject != null)
{
    //do a thing
}