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Since your service will be sending a cancel message to Share Point, the add-in will not be removed from the recycle bin.

If it is restored from there and used again, it may fail to work without that database entry.

For details, see New name for apps for Office and Share Point.

Share Point ホスト型 Share Point アドインはイベント処理をサポートしていませんが、ワークフローをトリガーするようにイベントを設定することによってワークフローをリストやリスト項目イベント ハンドラーに近いものに変換できます。「Share Point のワークフロー」をご覧ください。ワークフローをアドイン イベントによってトリガーすることはできないため、アドイン イベントは Share Point ホスト型アドインを使用して処理できません。Share Point-hosted Share Point Add-ins do not support event handling, but you can turn a workflow into a kind of list or list item event handler by setting an event to trigger the workflow. Workflows cannot be triggered by add-in events, so add-in events cannot be handled with a Share Point-hosted add-in.

To handle list and list item events, you create remote event receivers (RERs), which are web services that run externally to the Share Point farm or Share Point Online.

In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.

App Upgraded イベントは、アドインを新しいバージョンに更新するときに実行する必要がある事柄すべてを Share Point が完了した直後、なおかつ更新の完了がユーザーに通知される前に実行されます。App Installed イベントと同様、これは after イベントですが、本質的には同期で、エラーをキャッチし、Share Point に更新のロールバックを通知するためのベスト プラクティスです。The App Upgraded event runs immediately after Share Point has finished everything that it needs to do when the add-in is updated to a new version, but before the user is notified that updating is complete.

Like the App Installed event, it is an after event, but is essentially synchronous and it is a best practice to catch errors and notify Share Point to roll back the update.

The add-in doesn't even have to have an add-in web.

There are three add-in events as described in the next sections.

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