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Метод CustomValidationAttribute "<var>Method name</var>" типа "<var>Type Name</var>" должен отвечать ожидаемой сигнатуре: public static ValidationResult <var>Method name</var>(object value, ValidationContext context). Значение может иметь строгий тип. Параметр ValidationContext необязателен.
Unlocalized message
The CustomValidationAttribute method '<var>Method name</var>' in type '<var>Type Name</var>' must match the expected signature: public static ValidationResult <var>Method name</var>(object value, ValidationContext context). The value can be strongly typed. The ValidationContext parameter is optional.
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