c# - Counting number of occurrences of characters from array in string? -

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i'm writing code determine whether password contains enough punctuation characters.

how count number of occurrences of characters set?

something along these lines:

private const string nonalphanumericcharset = "#*!?£$+-^<>[]~()&"; ... public static bool passwordmeetsstrengthrequirements(string password) {     return password.length >= minimum_password_length && password.numberofoccurences(nonalphanumericcharset.tochararray()) >= minimum_nonalphanumeric_chars; }

bonus points elegant linq solution.

how count number of occurences of characters set?

var count = password.count(nonalphanumericcharset.contains);

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