C# Corner Listing #3: Watch Out for Side Effects (C#)

public class HelperClass
	private string resultFromCalculation;

	public string Result
				if (resultFromCalculation == null)
					resultFromCalculation = 
			return resultFromCalculation; 

	private string reallyLongCalculation()
		return "this took a long time";
Listing 3: This implementation only computes the result when client code asks for it. That’s fine, but this rather naïve implementation might exhibit race conditions in a multithreaded program. When you introduce side effects in later releases, you need to ensure that those side effects do not cause problems for client code.
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