Determine if executing in finally block due to exception being thrown

Question

Is it possible to determine if code is currently executing in the context of a finally handler as a result of an exception being thrown? I\'m rather fond of usi

Answer 1

I think the best way is to use write out try/catch/finally clause manually. Study an item from the first 'Effective c#" book. A good C# hacker should know exactly what using expands to. It has changed a bit since .Net 1.1 - you can now have several using one under another. So, use reflector, and study the un-sugared code.

Then, when you write your own code - either use the using or write your own stuff. It is not terribly hard, and a good thing to know.

You could get fancy with other tricks, but it feels too heavy, and even not efficient. Let me include a code sample.

LAZY WAY:

using (SqlConnection cn = new SqlConnection(connectionString))
using (SqlCommand cm = new SqlCommand(commandString, cn))
{
    cn.Open();
    cm.ExecuteNonQuery();
}

MANUAL WAY:

bool sawMyEx = false;
SqlConnection cn =  null;
SqlCommand cm = null;

try
{
    cn = new SqlConnection(connectionString);
    cm = new SqlCommand(commandString, cn);
    cn.Open();
    cm.ExecuteNonQuery();
}
catch (MyException myEx)
{
    sawMyEx = true; // I better not tell my wife.
    // Do some stuff here maybe?
}
finally
{
    if (sawMyEx)
    {
        // Piss my pants.
    }

    if (null != cm);
    {
        cm.Dispose();
    }
    if (null != cn)
    {
        cn.Dispose();
    }
}