下圖主要想說.net拋錯后的優先級，
錯誤1是根本原因，排第一位；
錯誤2里的方法包含了錯誤1，排第二位；
錯誤3就是整個Action了。
類似這樣的錯誤，按照這樣的順序來解決bug,相信很受用。
免責聲明！
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