沒有 '<var>X</var>' 的公用預設建構函式。這可能是由 '<var>X</var>' 標記所參照，或是它可能是屬性項目的預設型別。

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There is no public default constructor for '<var>X</var>'. This might be referenced by a '<var>X</var>' tag, or it might be the default type for a property element.

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