Why is this returning true ? string.Empty.All(_ => char.IsNumber(_));

[leonidasdedousis]

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Describe the bug

string.Empty returns true on the IsNumber test

string.Empty.All(_ => char.IsNumber(_)); => true

Expected Behavior

Return False

Steps To Reproduce

string.Empty.All(_ => char.IsNumber(_));

Exceptions (if any)

No response

.NET Version

No response

Anything else?

No response

[martincostello]

This question isn't related to ASP.NET Core itself, but the answer can be found in the documentation for LINQ's All() method:

Returns true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

As string.Empty is an empty sequence of characters, it returns true.

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