Оператор "<var>X</var>" в позиции <var>Y</var> выражения "<var>Z</var>" не поддерживается для литерала "null". Поддерживаются только проверки равенства.

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The operator '<var>X</var>' at position <var>Y</var> of expression '<var>Z</var>' is not supported for the 'null' literal; only equality checks are supported.

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