Whenever I look deeply enough into reflector I bump into extern methods with no source. I read the msdn documentation at http://msdn.microsoft.com/en-us/library/e59b22c5(v=vs.80).aspx. What I got from that article is that methods with the extern modifier have to be injected. I interpreted this to mean it works something like an abstract factory pattern. I also noticed that I've never seen
每当我对反射镜看得足够深的时候,我都会碰到extern方法。 我阅读http://msdn.microsoft.com/en-us/library/e59b22c5(v=vs.80).aspx上的msdn文档。 我从那篇文章中得到的结果是,带有extern修饰符的方法必须被注入。 我将其解释为意味着它像抽象工厂模式那样工作。 我也注意到,我从来没有见过非静态的extern方法。 静态声明是一个要求(我可以看到这是如何有意义的)? 我仍然在这里猜测,我不确定它是如何工作的。 在我
I'm building a message router and would like it to be as fast as possible. I want to stay within c# 4.0 and want to use sockets as fast as possible. I may not need to bring all the data into managed memory. I am dealing with byte arrays and am bringing the data into managed memory using this method (unless a better option is found): http://www.codeproject.com/KB/cs/ReadingStructuresEmit.as
我正在构建一个消息路由器,并希望它尽可能快。 我想留在C#4.0中,并希望尽可能快地使用套接字。 我可能不需要将所有数据放入托管内存中。 我正在处理字节数组,并使用此方法将数据带入托管内存(除非找到更好的选项):http://www.codeproject.com/KB/cs/ReadingStructuresEmit.aspx 问题: 1)在不安全的情况下使用套接字是否会有性能提升? 多少? 2)使用这样的不安全方法时是否存在拼写或数据编组冲突(所有结构
A String is a reference type even though it has most of the characteristics of a value type such as being immutable and having == overloaded to compare the text rather than making sure they reference the same object. Why isn't string just a value type then? Strings aren't value types since they can be huge, and need to be stored on the heap. Value types are (in all implementations of
一个String是一个引用类型,即使它具有值类型的大多数特征,例如不可变,并且已经重载==来比较文本,而不是确保它们引用同一个对象。 为什么不是字符串只是一个值类型呢? 字符串不是值类型,因为它们可能很大,并且需要存储在堆中。 值类型是(在CLR的所有实现中)存储在堆栈上的。 堆栈分配字符串会破坏各种各样的东西:堆栈只有1MB,你必须打包每个字符串,招致副本处罚,你不能实习字符串,并且内存使用会膨胀等等。
Since C# supports Int8 , Int16 , Int32 and Int64 , why did the designers of the language choose to define int as an alias for Int32 instead of allowing it to vary depending on what the native architecture considers to be a word ? I have not had any specific need for int to behave differently than the way it does, I am only asking out of pure encyclopedic interest. I would think that a 64-bit
由于C#支持Int8 , Int16 , Int32和Int64 ,为什么该语言的设计人员选择将int定义为Int32的别名,而不是根据本机体系结构认为是一个word而使其变化? 我没有任何特别的需要int的行为有别于它的行为方式,我只是要求纯粹的百科兴趣。 我认为可以设想一个64位RISC架构,它可以最有效地支持64位数量,而对32位数量的操作则需要额外的操作。 在程序坚持使用32位整数的世界中,这样的架构将处于劣势,这是另一种说C#成为未来
I'm trying to create a new object of type T via its constructor when adding to the list. I'm getting a compile error: The error message is: 'T': cannot provide arguments when creating an instance of a variable But my classes do have a constructor argument! How can I make this work? public static string GetAllItems<T>(...) where T : new() { ... List<T> tab
我试图在添加到列表中时通过其构造函数创建类型T的新对象。 我收到一个编译错误:错误信息是: 'T':创建变量实例时不能提供参数 但是我的类有一个构造函数参数! 我该如何做这项工作? public static string GetAllItems<T>(...) where T : new() { ... List<T> tabListItems = new List<T>(); foreach (ListItem listItem in listCollection) { tabListItems.Add(new T(
For part of my university Computer Science course we need to learn C. My lecturer recommended K&R's The C Programming Language 2nd Edition. After reading the first few pages it clearly states that the book is not a full guide and might be misleading at times so I'm wondering if I should 'learn' C from this book? (its also quite an old book) I come from a basic Java backgro
对于我的大学计算机科学课程的一部分,我们需要学习C.我的讲师推荐了K&R的The C Programming Language 2nd Edition。 在阅读前几页后,它清楚地表明,这本书不是一本完整的指南,有时可能会产生误导,所以我想知道我是否应该从本书中“学习”C? (它也是一本很老的书) 我来自基本的Java背景,所以我理解程序的基本元素(变量,数据类型,循环等),所以查看C语法不应该太过震撼。 K&R是从中学习C的标准文本。 它也被认
What small open source projects in C are interesting for learning good design? The project should be: Not too large (like the linux kernel) Well documented Perhaps still under active development I've just started learning C, and while the language itself is not too difficult, i'm struggling how to design larger applications, so i thought checking out other open source projects w
C中的哪些小型开源项目对于学习良好的设计很有意思? 该项目应该是: 不要太大(像linux内核) 有据可查 也许还在积极发展 我刚刚开始学习C语言,虽然语言本身并不难,但我正在努力设计更大的应用程序,所以我认为查看其他开源项目将是一个很好的起点。 谢谢! 在我看来,用C编写的中等规模项目的好例子是: GNU科学图书馆(除了源代码,不要错过他们的设计文档) Kazlib 混帐 Redis(nosql db)是: 积
What would be a set of nifty preprocessor hacks (ANSI C89/ISO C90 compatible) which enable some kind of ugly (but usable) object-orientation in C? I am familiar with a few different object-oriented languages, so please don't respond with answers like "Learn C++!". I have read "Object-Oriented Programming With ANSI C" (beware: PDF format ) and several other interesting s
什么是一组漂亮的预处理器黑客(兼容ANSI C89 / ISO C90),它在C中启用某种丑陋(但可用)的面向对象? 我熟悉几种不同的面向对象的语言,所以请不要回答“Learn C ++!”这样的答案。 我读过“面向对象编程与ANSI C”(当心: PDF格式 )和其他一些有趣的解决方案,但我最感兴趣的是你们:-)! 另请参阅可以在C中编写面向对象的代码吗? C对象系统(COS)听起来很有前途(它仍然是alpha版本)。 为了简单和灵活性,它试图尽
What does the extern keyword mean? I've seen that in front of an function declaration like extern void DoFoo ... extern gives a name external linkage. This means that the object or function is accessible through this name from other translation units in the program. For functions, this is the default linkage in any case so its usage (in this context) is usually redundant. The extern ke
extern关键字是什么意思? 我在类似的函数声明前看到了这一点 extern void DoFoo ... extern给出了一个名称的外部链接。 这意味着该对象或函数可以通过程序中其他翻译单元的名称访问。 对于函数,这是任何情况下的默认链接,所以它的用法(在这种情况下)通常是多余的。 extern关键字声明一个变量或函数,并指定它具有外部链接(其名称可以从定义的文件以外的文件中看到)。 当修改变量时,extern指定该变量具有静态持续
I have doubt on Memory Management in .Net. As per my understanding the memory is allocated and regained as below : For all value types, framework will allocate memory in the stack. For all reference types, the memory will be allocated in the heap, which will be later flushed out or managed by the GC. For the memory allocated in the stack, the memory will be cleared in the LIFO method, when
我怀疑.Net中的内存管理。 根据我的理解,记忆被分配并恢复如下: 对于所有值类型,框架将在堆栈中分配内存。 对于所有的参考类型,内存将被分配到堆中,然后由GC进行刷新或管理。 对于在堆栈中分配的内存,当执行完成时,内存将在LIFO方法中清除。 我怀疑是在下面的情况: Class MathLibrary{ int number1; int number2; public int computesum(){ return number1 + number2; } } MathLibrary maths = new Mat