📌  相关文章
📜  c# 问号 - C# 代码示例

📅  最后修改于: 2022-03-11 14:48:52.340000             🧑  作者: Mango

代码示例1
FileInfo fi = ...; // fi could be null
long? length = fi?.Length; // If fi is null, length will be null