stringtest=null;
test.IsNull(); // true"".IsNull(); // false"".IsNull(); // False"Lorem ipsum dolor sit amet".IsNull(); // False
IsNullOrWhiteSpace
stringtest=null;
test.IsNullOrWhiteSpace(); // True"".IsNullOrWhiteSpace(); // True"".IsNullOrWhiteSpace(); // True"Lorem ipsum dolor sit amet".IsNullOrWhiteSpace(); // False
IsNullOrEmpty
stringtest=null;
test.IsNullOrEmpty(); // True"".IsNullOrEmpty(); // True"".IsNullOrEmpty(); // False"Lorem ipsum dolor sit amet".IsNullOrEmpty(); // False
LengthOnly
"aa AA bb ba".LengthOnly('a'); // 3"aa aa bb ba".LengthOnly('a'); // 5"8eb06d03-aaf5-491c-9a1f-d16f19a58d61".LengthOnly('a') // 4"Lorem ipsum dolor sit amet".LengthOnly('a'); // 1"Lorem ipsum dolor sit amet".LengthOnly('o'); // 3
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