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c#stringcontains

check if string contains exactly one char

How could I check if a string contains exactly one char?

Example:

  • strings → check for 1 i → true
  • strings → check for 1 s → false

I've tried to use Contains but it checks for 1 or more.

Solution

  • You could use this Linq query to solve it.

    "strings".Where(c => c == 's').Count() == 1 // gives false
"strings".Where(c => c == 'i').Count() == 1 // gives true

    Explanaition:

    • The Where method ask for a lamdba expression that checks if a char (variable c) of the given string (strings) is equal to respectively s or i and returns a list of chars that are equal to the condition.

    • The Count method counts the results of that list.

    • Finaly just check if the result is equal to one.