When should you use struct and not class in C#? My conceptual model is that structs are used in times when the item is merely a collection of value types. A way to logically hold them all together into a cohesive whole. I came across these rules here: A struct should represent a single value. A struct should have a memory footprint less than 16 bytes. A struct should not be changed afte
什么时候应该在C#中使用struct而不是类? 我的概念模型是,当项目仅仅是一个值类型集合的时候,使用了结构体。 从逻辑上把它们组合在一起成为一个有凝聚力的整体。 我在这里遇到了这些规则: 结构应该代表一个单一的值。 一个结构应该有一个小于16字节的内存占用。 创建后不应更改结构。 这些规则是否有效? 结构在语义上是什么意思? OP引用的源代码有一些可信度......但是微软呢 - 结构使用的立场是什么? 我
I have taken a look at: How do I make a unit test to test a method that checks request headers? How to mock Controller.User using moq How do I unit test a controller method that has the [Authorize] attribute applied? I am trying to test a custom AuthorizeAttribute that I wrote. I have tried many different things to get it to work. This is my current attempt. [AttributeUsage(AttributeT
我看了一下: 如何进行单元测试以测试检查请求标头的方法? 如何使用moq模拟Controller.User 如何单元测试具有[Authorize]属性的控制器方法? 我试图测试我写的一个自定义的AuthorizeAttribute。 我已经尝试了许多不同的事情来实现它。 这是我目前的尝试。 [AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = true)] public class ConfigurableAuthorizeAttribute : AuthorizeAttribute {
Taking my very first babysteps with Entity Framework 5.0, I run into an exception with the very first Entity I create. Please note that every table created after that works just fine. Also, do note that I've taken the usual steps of regenerating the database and/or restarting the Visual Studio IDE. Using Model-First, I created a trivial table called Contacts , defined as <EntityTyp
以我的第一个实体框架5.0来实现我的第一个实例,我遇到了第一个实体创建的异常。 请注意,之后创建的每个表格都可以正常工作。 另外,请注意,我已经采取了重新生成数据库和/或重新启动Visual Studio IDE的通常步骤。 使用模型 - 首先,我创建了一个名为Contacts的简单表格,定义为 <EntityType Name="Contacts"> <Key> <PropertyRef Name="ContactID" /> </Key> <Property
I have a VS 2010 C# .NET 4 project. The issue is that the program is not breaking on 'NullReferenceException' errors during debugging. The output window will display the following: A first chance exception of type 'System.NullReferenceException' occurred in myProgram.exe ...but the debugger will just exit out of the function and continue running the rest of the program. H
我有一个VS 2010 C#.NET 4项目。 问题是程序在调试过程中没有打破'NullReferenceException'错误。 输出窗口将显示以下内容: A first chance exception of type 'System.NullReferenceException' occurred in myProgram.exe ...但调试器将退出该功能并继续运行程序的其余部分。 我该如何改变这种行为,以便调试器将打破这些异常? 去调试 - >例外 - >搜索NullReferenceException并检查“抛出”复
We all know that Debug.Assert will not be compiled into the dlls when compiled in release mode. But for some reason Debug.Assert did appear in the release version of a component I wrote. I suspect that I might have mess up my csproject setting. Any idea why Debug.Assert appears in release mode? P/S: I have double checked to make sure that I was really compiling in release mode before asking
我们都知道Debug.Assert在发布模式下编译时不会编译到dll中。 但由于某种原因, Debug.Assert确实出现在我编写的组件的发行版中。 我怀疑我可能搞砸了我的csproject设置。 任何想法为什么Debug.Assert在发布模式下出现? P / S:在提出这个问题之前,我进行了双重检查,以确保我真的在发布模式下编译。 注2:我已经重新检查了我的csproject,并且我发现在Release配置中, Define DEBUG常量没有打勾,表明对于这部分我的
I am trying to create a simple virus remover. The algorithm I developed is meant to: inspect the original file and the infected file separate the virus from the infected file use same algorithm for repairing other files infected with the virus I know this is possible, since this is the same way patches are created, but I am a little bit lost on how to go about with this. Any help aroun
我正在尝试创建一个简单的病毒清除器。 我开发的算法是为了: 检查原始文件和受感染的文件 将病毒从受感染的文件中分离出来 使用相同的算法修复感染病毒的其他文件 我知道这是可能的,因为这与修补程序的创建方式相同,但我在如何解决这个问题上有点失落。 任何帮助? 你必须投入更多的智慧,而不是简单地做一些模式匹配,并删除孤立的病毒代码。 您瞄准的病毒是在我们的日子里很少使用的文件感染者。 大多数时
A menu in an application of mine is going to contain too many items to be displayed in a single vertical row. Splitting it into 2 menus does not look a good solution as it would break UI semantics. Can I just set up one menu to be displayed with multiple columns (like Windows XP classic Start menu in case of vertical overflow)? How about creating some levels for the menu instead of splitting
我的一个应用程序中的菜单将包含太多项目,以便在一个垂直行中显示。 将其拆分为2个菜单看起来不太好,因为它会破坏UI语义。 我可以只设置一个菜单以显示多列(如Windows XP经典开始菜单,以防止出现垂直溢出)? 如何为菜单创建一些级别而不是垂直分割菜单? 你的选择不能分组吗? 编辑: 不知道我为什么被低估,但如果你不想打破菜单的语义和: 创建长度为50海里的物品的不可读菜单 或创建这样的菜单,然后强行将
In the past, I have created a component to pass and retrieve values to/from excel using the excel libraries. The good thing is that once you have your workbook in memory and modify a cell (let's call it the origin cell) all the other cells with formulas that take this origin cell value are automatically refreshed. Is this possible in OpenXml? As far as I see, apparently this doesn't
在过去,我创建了一个组件来使用excel库传递和从excel中检索值。 好的一点是,一旦你将你的工作簿放在内存中并修改一个单元格(我们称之为原始单元格),所有其他单元格都带有这个原始单元格值的公式会自动刷新。 这在OpenXml中可能吗? 就我所见,显然这在OpenXml中不会发生,因为excel引擎并没有在后台真正执行,OpenXml只是一组用于序列化,反序列化,读取等xml文件的类吧? 这是正确的,Office Open XML SDK只是一组
My question is not about floating precision. It is about why Equals() is different from == . I understand why .1f + .2f == .3f is false (while .1m + .2m == .3m is true ). I get that == is reference and .Equals() is value comparison. (Edit: I know there is more to this.) But why is (.1f + .2f).Equals(.3f) true , while (.1d+.2d).Equals(.3d) is still false ? .1f + .2f == .3f;
我的问题不是浮动精度。 这是关于Equals()与==不同的原因。 我明白为什么.1f + .2f == .3f是false (而.1m + .2m == .3m是true )。 我得到的==是引用和.Equals()是价值比较。 (编辑:我知道还有更多。) 但为什么(.1f + .2f).Equals(.3f) true ,而(.1d+.2d).Equals(.3d)仍然是false ? .1f + .2f == .3f; // false (.1f + .2f).Equals(.3f); // true (.1d + .2d).Equals(.3d); // false
I'm taking a security course which needs us to do format string attack on an unix virtual machine. The vulnerability is a format string using command line argument. My question is how can I write value into an address in format string (like write shell code address into function return address)? For example, I try to write value 987654 into the return address location 0xaabbccdd. I trie
我正在参加一个安全课程,它需要我们在unix虚拟机上进行格式化字符串攻击。 该漏洞是使用命令行参数的格式字符串。 我的问题是如何写入格式字符串的地址值(如写入shell函数返回地址)? 例如,我尝试将值987654写入返回地址位置0xaabbccdd。 我尝试了一些字符串,例如"AAAA_%10$x" ,这可以导致程序打印AAAA_41414141 。 然后我用我的地址替换这些字母并尝试覆盖它。 xddxccxbbxaa_%10$x_%54321x_%n" 但它