在catch区继续

Question

Is this:

// retry
for (int i = 0; i < length; ++i)
{
    try
    {
        sqlCommand.ExecuteNonQuery();
    }
    catch (SqlException e)
    {
        if (e.Number == 64)
        {
            continue;
        }
    }
}

equivalent to:

// retry
for (int i = 0; i < length; ++i)
{
    try
    {
        sqlCommand.ExecuteNonQuery();
    }
    catch (SqlException e) { }
}

(since the loop will continue anyway in latter case)

What is the difference (if any)?

Answer 1

continue let you to skip the remaining statments in the current loop, and jump to the next iteration.

Given the code we have right now, it makes no difference. Since there is no more code after if (e.Number == 64) { continue; } if (e.Number == 64) { continue; } .

Answer 2

Both are identical !! But its not a good practice to have empty catch statement in your code .. The first piece of code is more appropriate .. you can add code to come out of the for loop or log an exception if the if (e.Number == 64)

Answer 3

For all practical intents, the code segments are equivalent. There is an edge case, however, that in principle should never happen: what happens if the getter e.Number is evaluated and throws an exception? If this were to happen, the code in the first example would throw, whereas the second example would continue.

Given that a property getter should never throw an exception , it's difficult to imagine this being a practical issue for .NET framework classes. But for this reason, the segments are (strictly speaking) not identical.