What s the strangest corner case you ve seen in C or NET

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I have a small collection of puzzles and corner cases, and I'm constantly interested in learning more. The page mainly deals with bits and pieces of the C# language, although I also find the fundamentals of.NET interesting. Here's one that isn't on the page but that I think is incredible:

string x = new string(new char[0]);
string y = new string(new char[0]);
Console.WriteLine(object.ReferenceEquals(x, y));

Since "new" (when used with a reference type) always creates a new object, I would anticipate that to print False. It should, according to the specifications for both C# and the CLI. Well, not in this specific instance. On every version of the framework I've tested it with, it prints True. (I must admit that I haven't tried it on Mono.)

Just to be clear, I wasn't specifically searching for a debate or explanation of this peculiarity; this is merely an example of the kind of stuff I'm looking for. (It differs from standard string interning in that string interning typically doesn't take place when a function Object() { [native code] } is called.) In reality, I was requesting odd behaviour just like that.

Any other hidden treasures out there?

Dec 12, 2022 in C# by Roshan
• 300 points
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