Message in Japanese (日本語)

'<var>X</var>' に '<var>Y</var>' の定義が含まれておらず、型 '<var>X</var>' の最初の引数を受け付ける拡張メソッド '<var>Y</var>' が見つかりませんでした。using ディレクティブまたはアセンブリ参照が不足しています

Unlocalized message

'<var>X</var>' does not contain a definition for '<var>Y</var>' and no extension method '<var>Y</var>' accepting a first argument of type '<var>X</var>' could be found (are you missing a using directive or an assembly reference?)

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