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8 种提升 ASP.NET Web API 性能的方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...b API 是非常棒的技术。编写 Web API 十分容易，以致于很多开发者没有在应用程序结构设计上花时间来获得很好的执行性能。英文原文：8 ways to improve ASP.NET Web API performance
ASP.NET Web API 是非常棒的技术。编写 Web API 十分容易，以致...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ce
简介
如果你想为ros做贡献——不论是加入到源代码的开发中，还是帮助测试ros的关键部分——你都需要了解如何生成重要的调试日志。
对于开发者来说，如果想准确地找出和判断ros的运行状态，调试信息是非常重要的。从...
When to use NSInteger vs. int
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You usually want to use NSInteger when you don't know what kind of processor architecture your code might run on, so you may for some reason want the largest possible integer type, which on 32 bit systems is just an int, while on a ...
find vs find_by vs where
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Use whichever one you feel suits your needs best.
The find method is usually used to retrieve a row by ID:
Model.find(1)
It's worth noting that find will throw an exception if the item is not found by the attribute that you supply. Use where (as described below, which will return an empty arr...
“static const” vs “#define” vs “enum”
...sion for static arrays at function scope; both (2) and (3) can.
Under C99, all of these can be used for local arrays. Technically, using (1) would imply the use of a VLA (variable-length array), though the dimension referenced by 'var' would of course be fixed at size 5.
(1) cannot be used in place...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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总结
本教程提供了完整的MQTT物联网应用开发方案，涵盖了从基础概念到高级应用的各个方面。通过实际项目案例，展示了如何使用App Inventor构建可靠的物联网应用，包括：
完整的MQTT连接管理：自动重连、错...
What are the rules for the “…” token in the context of variadic templates?
...template parameter pack if it appears on the right side of an expression (call this expression pattern for a moment), or it's a pack argument if it appears on left side of the name:
...thing // pack : appears as template arguments
thing... // unpack : appears when consuming the arguments
The ru...
Which method performs better: .Any() vs .Count() > 0?
...le<T> sequence.
For just IEnumerable<T>, then Any() will generally be quicker, as it only has to look at one iteration. However, note that the LINQ-to-Objects implementation of Count() does check for ICollection<T> (using .Count as an optimisation) - so if your underlying data-sou...
Disable Visual Studio code formatting in Razor
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Actually it's worse in 2015 than the 2013 version (the same apply to C# where it will indent unrelated things each time you open a brace). I used to love visual studio but this is slowly killing it.
– youen
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String concatenation in Ruby
...ficient in term of memory/speed from what I've seen (not measured though). All three methods will throw an uninitialized constant error when ROOT_DIR is nil.
When dealing with pathnames, you may want to use File.join to avoid messing up with pathname separator.
In the end, it is a matter of taste....