C# 宣告變數時,型別帶"?"(問號),表示變數可接受null值
https://dotblogs.com.tw/charleen/2017/12/26/100359
https://blog.miniasp.com/post/2007/10/28/New-operator-found-in-CSharp-question-mark.aspx
WPF聊天室应用(ASP.NET Core SignalR) https://www.bilibili.com/video/BV1Q741187Si?p=2 https://www.bilibili.com/video/BV1UV411e75T?from=search&...
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