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You can breathe a sigh of relief. Our long national nightmare is over: this is the end of CLR Week 2008. We wind down with a look back at iterators. Michael Entin points out that you can use C# iterators to make asynchronous code easier to write. You can use C# iterators for more than simply iterating. The automatic conversion of...

I mentioned that there was an exception to the general statement that the conversion of an iterator into traditional C# code is something you could have done yourself. That's true, and it was also a pun, because the exception is exception handling. If you have a try ... finally block in your iterator, the language executes the finally block und...

Now that you have the basic idea behind iterators under your belt, you can already answer some questions on iterator usage. Here's a scenario based on actual events: I have an iterator that is rather long and complicated, so I'd like to refactor it. For illustrative purposes, let's say that the enumerator counts from 1 to 100 twice. (In real l...

Like anonymous methods, iterators in C# are very complex syntactic sugar. You could do it all yourself (after all, you did have to do it all yourself in earlier versions of C#), but the compiler transformation makes for much greater convenience. The idea behind iterators is that they take a function with yield return statements (and possible s...

As is customary, the first day of CLR Week is a warm-up. Actually, today's question is a BCL question, not a CLR question, but only the nitpickers will bother to notice. Can somebody explain why StreamReader can’t read apostrophes? I have a text file, and I read from it the way you would expect: StreamReader sr = new StreamReader("myfil...

Welcome to CLR Week 2008. I'm going to mix it up and start with a link listing. Other CLR topics:

If you return from , will you get a ? Yes. No. ... Yes. All three answers are correct, for different formulations of the question. From the kernel's point of view, the answer is a simple Yes. If a DLL's entry point returns to the notification, it will receive a notification. However, most C and C++ programs do not use the ra...

We saw earlier that the caret is the escape character for the batch language. In a comment to that article, KJK::Hyperion mentioned that the caret serves as the line continuation character. A useful tip if you still find yourself messing with batch files. Mark Yocum elaborates on this point a bit more.

Some people didn't take to heart my cautions on the subject of attached input queues, item number five on the list of five things every Win32 programmer should know. And then they find that their application stops responding. // Code in italics is wrong void TryToStealFocus(HWND hwnd) { // First try plain SetForegroundWindow SetForegroundWi...

Last time, we wrote a tiny program to simulate dropping a file on another file, but we discovered that it didn't work for dropping a file onto Mail Recipient.MAPIMail. The reason, as you no doubt instantly recognized, is that the MAPIMail handler creates a worker thread, and we're exiting the process before the worker thread has finished its work....