データメンバー '<var>Member</var>' がその型階層内で重複しているため、データコントラクト型 '<var>Type Name</var>' は、DataContractJsonSerializer でシリアル化できません。

Message in Japanese (日本語)

Unlocalized message

The data contract type '<var>Type Name</var>' is not serializable with DataContractJsonSerializer because the data member '<var>Member</var>' is duplicated in its type hierarchy.

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