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Why are there no ||= or &&= operators?

By pure accident I found out today that

 a &= GetBool();

is NOT the same as

 a = a && GetBool();

I must have misunderstood that for years. In the first Example, "GetBool()" is executed even if "a" is false. In the second, it isn't.

Is there anything to achieve something like "&&=" in C#?

c# boolean-operations
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