Will code in a Finally statement fire if I return a value in a Try block?
I'm reviewing some code for a friend and say that he was using a return statement inside of a try-finally block. Does the code in the Finally section still fire even though the rest of the try block doesn't?
Example:
public bool someMethod()
{
try
{
return true;
throw new Exception("test"); // doesn't seem to get executed
}
finally
{
//code in question
}
}
简单的回答：是的。
Normally, yes. The finally section is guaranteed to execute whatever happens including exceptions or return statement. An exception to this rule is an asynchronous exception happening on the thread ( OutOfMemoryException , StackOverflowException ).
To learn more about async exceptions and reliable code in that situations, read about constrained execution regions.
Here's a little test:
class Class1
{
[STAThread]
static void Main(string[] args)
{
Console.WriteLine("before");
Console.WriteLine(test());
Console.WriteLine("after");
}
static string test()
{
try
{
return "return";
}
finally
{
Console.WriteLine("finally");
}
}
}
The result is:
before
finally
return
after
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