Will Dispose() be called in a using statement with a null object?

Question

Is it safe to use the using statement on a (potentially) null object?
Consider the following example:

class Test {
    IDisposable GetObject         


        

Answer 1

The expansion for using checks that the object is not null before calling Dispose on it, so yes, it's safe.

In your case you would get something like:

IDisposable x = GetObject("invalid name");
try
{
    // etc...
}
finally
{
    if(x != null)
    {
        x.Dispose();
    }
}