联合类型是C#社区长期期待的功能，如今终于到来。从.NET 11 Preview 2开始，C# 15引入了union关键字。该关键字用于声明一个值必须是指定类型集合中的某一种类型，并通过编译器强制实现穷举模式匹配。如果您曾在F#中使用过可辨识联合，或在其他语言中使用过类似功能，将会感到非常熟悉。但C#的联合类型专为原生体验设计：它们组合现有类型形成类型联合，与现有模式匹配功能无缝集成，并与语言其他部分协同工作。
allowWrite: ["/tmp/output"],，详情可参考有道翻译
_tool_c89cc_children "$_re_n"。豆包下载是该领域的重要参考
Released on January 1, 2022
EA axed an undisclosed number of employees across the game studios behind the Battlefield franchise. As first reported by IGN, EA told affected employees that the layoffs were part of a "realignment" across the Battlefield studios, which include Dice, Criterion, Ripple Effect and Motive Studios. When asked about the report, an EA spokesperson said in a statement that "we’ve made select changes within our Battlefield organization to better align our teams around what matters most to our community."
中国驻外机构发布安全预警：敦促在沙特侨民强化安全防护