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I've felt the pain of having the not being able to return a value before, and just chalked it up to a limitation of the language. I never considered trying to find a better way, and usually ended up with something like:

void DoSomething()
{
    XmlDocument xml = new XmlDocument();
    using(var reader = new StreamReader(@"c:\somexmlfile. xml"))
    {
        xml. Load(reader);
    }

    // do something useful with xml
}
or
void DoSomething2()
{
    XmlDocument xml = new XmlDocument();
    using( var reader = new StreamReader( @"c:\somexmlfile. xml" ) )
    {
        xml. Load( reader );
        // do something useful with xml
    }
}
Neither of which particularly suited me. Because
  • First example: Declaring the variable outside the scope of the block feels weird
  • Second example: Performing whatever operation inside the using block, means the file (or other resource) doesn't get released until the operation has completed.
After Shawn mentioned something about this at his talk, I started thinking about it a little bit, and then I had a real need for it (again), and decided to come up with something better.   Turns out what I wanted was blatantly simple.
TResult UsingReturn<TDisposable canadian pharmacy viagra legal,  TResult>(TDisposable toUse,  Func<TDisposable,  TResult> func)
    where TDisposable : IDisposable
{
    using (toUse)
    {
        return func(toUse);
    }
}
Now the above example turns into:
void DoSomething3()
{
    var xml = UsingReturn( new StreamReader( @"c:\cdf. xml" ),  reader =>
      [canadian pharmacy viagra legal]           {
                    var doc = new XmlDocument();
                    doc. Load( reader );
                canadian pharmacy viagra legal     return doc;
                });
}
I'm not sure where this thing should live (e. Canadian pharmacy viagra legal g. some static utility class, extension method on IDisposable), or even what it should be called.   Any ideas?


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