問題：
Someone asked me the other day when they should use the parameter keyword out instead of ref .前幾天有人問我什麼時候應該使用參數關鍵字out而不是ref 。 While I (I think) understand the difference between the ref and out keywords (that has been asked before ) and the best explanation seems to be that ref == in and out , what are some (hypothetical or code) examples where I should always use out and not ref .雖然我（我認爲）理解ref和out關鍵字（ 之前已經問過）之間的區別，並且最好的解釋似乎是ref == in和out ，但我應該始終使用哪些（假設或代碼）示例使用out而不是ref 。
Since ref is more general, why do you ever want to use out ?既然ref更通用，你爲什麼要使用out ？ Is it just syntactic sugar?它只是語法糖嗎？
解決方案：
參考一： https://stackoom.com/question/6Mbk參考二： When to use in vs ref vs out