https://blog.youkuaiyun.com/shichen19950724zh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/shichen19950724/article/details/152998522https://blog.youkuaiyun.com/shichen19950724/article/details/152998522shichen19950724Sat, 11 Oct 2025 02:57:40 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152998405https://blog.youkuaiyun.com/shichen19950724/article/details/152998405shichen19950724Sat, 11 Oct 2025 02:56:55 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152978363https://blog.youkuaiyun.com/shichen19950724/article/details/152978363shichen19950724Sat, 11 Oct 2025 00:52:09 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152862158https://blog.youkuaiyun.com/shichen19950724/article/details/152862158shichen19950724Fri, 10 Oct 2025 01:13:44 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152862084https://blog.youkuaiyun.com/shichen19950724/article/details/152862084shichen19950724Fri, 10 Oct 2025 01:12:47 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152861952https://blog.youkuaiyun.com/shichen19950724/article/details/152861952shichen19950724Fri, 10 Oct 2025 01:11:27 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152861852https://blog.youkuaiyun.com/shichen19950724/article/details/152861852shichen19950724Fri, 10 Oct 2025 01:10:17 +0800 0更高效，因为Any()在找到第一个匹配项后立即返回，而Count()需要遍历整个集合。对于数据库查询，Select投影会转换为SQL的SELECT子句，只查询指定的列，从而提高查询性能并减少内存占用。]]>https://blog.youkuaiyun.com/shichen19950724/article/details/152861769https://blog.youkuaiyun.com/shichen19950724/article/details/152861769shichen19950724Fri, 10 Oct 2025 01:09:22 +0800是stack-only结构体，通常分配在栈上，其生命周期与当前方法调用绑定，无法跨越异步等待点。相比之下，ReadOnlyMemory是常规结构体，可以存储在堆上，能够安全地跨越异步方法边界传递，适用于需要长期持有或异步操作的场景。例如，解析大型文本文件或网络数据包时，使用Span进行切片操作无需创建新的字符串或数组副本，直接减少内存分配。例如，处理1MB数据时，Span-based方案比传统方案减少99%的内存分配，执行时间缩短60%以上。]]>https://blog.youkuaiyun.com/shichen19950724/article/details/152802079https://blog.youkuaiyun.com/shichen19950724/article/details/152802079shichen19950724Thu, 09 Oct 2025 15:26:46 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152801996https://blog.youkuaiyun.com/shichen19950724/article/details/152801996shichen19950724Thu, 09 Oct 2025 15:25:21 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152753567https://blog.youkuaiyun.com/shichen19950724/article/details/152753567shichen19950724Thu, 09 Oct 2025 01:04:55 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152753492https://blog.youkuaiyun.com/shichen19950724/article/details/152753492shichen19950724Thu, 09 Oct 2025 01:03:45 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152753374https://blog.youkuaiyun.com/shichen19950724/article/details/152753374shichen19950724Thu, 09 Oct 2025 01:02:02 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152633450https://blog.youkuaiyun.com/shichen19950724/article/details/152633450shichen19950724Tue, 07 Oct 2025 02:27:02 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152633360https://blog.youkuaiyun.com/shichen19950724/article/details/152633360shichen19950724Tue, 07 Oct 2025 02:25:15 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152633198https://blog.youkuaiyun.com/shichen19950724/article/details/152633198shichen19950724Tue, 07 Oct 2025 02:24:11 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152577244https://blog.youkuaiyun.com/shichen19950724/article/details/152577244shichen19950724Mon, 06 Oct 2025 01:10:13 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152577128https://blog.youkuaiyun.com/shichen19950724/article/details/152577128shichen19950724Mon, 06 Oct 2025 01:08:56 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152576973https://blog.youkuaiyun.com/shichen19950724/article/details/152576973shichen19950724Mon, 06 Oct 2025 01:07:21 +0800https://blog.youkuaiyun.com/shichen19950724/article/details/152540870https://blog.youkuaiyun.com/shichen19950724/article/details/152540870shichen19950724Sun, 05 Oct 2025 05:55:38 +0800