Is code that uses the static Object.Equals to check for null more robust than code that uses the == operator or regular Object.Equals? Aren't the latter two vulnerable to being overridden in such a way that checking for null doesn't work as expected (eg returning false when the compared value is null)? In other words, is this: if (Equals(item, null)) { /* Do Something */ } more robus
使用静态Object.Equals检查null的代码是否比使用==运算符或常规Object.Equals的代码更健壮？ 是不是后两者容易被覆盖的方式检查null不能按预期工作（例如，当比较值为空时返回false）？ 换句话说，是这样的： if (Equals(item, null)) { /* Do Something */ } 比这更强大： if (item == null) { /* Do Something */ } 我个人发现后者的语法更易于阅读。 在编写处理作者控制范围之外的对象的代码时（例如库）是否应该避免
I want to use HaveBox for Dependency Injection. But it isn't question about HaveBox. So I created base controller: public abstract class BaseController : Controller { protected readonly IRepository m_Repository; protected BaseController(IRepository repository) { m_Repository = repository; } } And my HomeController was inherited from Ba
我想使用HaveBox进行依赖注入。 但这不是关于HaveBox的问题。 所以我创建了基本控制器： public abstract class BaseController : Controller { protected readonly IRepository m_Repository; protected BaseController(IRepository repository) { m_Repository = repository; } } 我的HomeController是从BaseController继承的。 添加HaveBoxConfig.RegisterTypes(
I have set up a VirtualPathProvider and it is working fine for direct url calls like http://.../home/index in the address bar. public class HomeController { public ActionResult Index() { // This triggers MyVirtualPathProvider functionallity when called via // the browsers address bar or anchor tag click for that matter. // But it does not trigger MyVirtualPathP
我建立了一个VirtualPathProvider并且它可以在地址栏中直接调用URL，例如http://.../home/index 。 public class HomeController { public ActionResult Index() { // This triggers MyVirtualPathProvider functionallity when called via // the browsers address bar or anchor tag click for that matter. // But it does not trigger MyVirtualPathProvider for 'in-view' calls like
I have a struct that holds a single object field to make working with the object easier. I wanted to test the performance (I expected some degradation), but I get very surprising results. The version with the struct actually is faster: Without box: 8.08 s With box: 7.76 s How is this possible? Below is the complete test code to reproduce the results. using System; using System.Collecti
我有一个struct保存单个object字段，使对象的工作更容易。 我想测试性能（我预计有些降级），但是我得到了非常令人惊讶的结果。 带有struct的版本实际上更快： 无框：8.08秒 带框：7.76秒 这怎么可能？ 以下是重现结果的完整测试代码。 using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Runtime.CompilerServices; using System.Text; using System.Threa
Given a base class Coin public class Coin { } and two derived classes Coin50Cent and Coin25Cent public class Coin50 : Coin { } public class Coin25 : Coin { } The task is to create an object of a CoinMachine (used for coin exchange, eg puting 50 cent coin returns two 25 cent coins) that corresponds the following requierments: CoinMachine must have two collections of Coin25Cent and Coin50cent
给定一个基类Coin public class Coin { } 和两个派生类Coin50Cent和Coin25Cent public class Coin50 : Coin { } public class Coin25 : Coin { } 任务是创建一个CoinMachine的对象（用于兑换硬币，例如将50美分的硬币退回两个25美分的硬币），它们对应以下要求： CoinMachine必须有两个Coin25Cent和Coin50cent对象的集合。 这些集合必须从具有两种方法的抽象通用类CoinStack<T>派生 void Push(T item); T Pop();
im currently implementing a shell in C. My problem arises when i try to run a command like this: SHELL$: sort < txtFile | grep key im running sort < txtFile in a process (child), and in the parent ie else if(pid > 0) im running the other command to the right of the pipe. The program runs fine, but it exits the infinite loop that i set up in main to keep receiving input from the user.
即时通讯目前在C中实现一个shell我的问题出现时，我尝试运行一个像这样的命令： SHELL$: sort < txtFile | grep key 即时通讯运行sort < txtFile在一个进程（子），并在父母，即else if(pid > 0)即时通讯管道右侧运行其他命令。 该程序运行良好，但它退出我主要设置的无限循环，以继续接收来自用户的输入。 我怎么能解决这个问题？ 这是我到目前为止处理管道的代码，我没有包含我必须处理重定向的代码： c2p
I'm trying to build gcc 4.6 for i386-elf target. My problem is as follows. When compiling libgcc I get the output-file _fixunsdfdi.o which make use of the global offset table. The function is used when converting 'double' to 'unsigned long long'. When i look at the assembly it looks like its the Wtype_MAXp1_F, that is placed in the GOT - but why? I configured with --t
我正在尝试为i386-elf目标构建gcc 4.6。 我的问题如下。 在编译libgcc我得到了使用全局偏移表的output-file _fixunsdfdi.o 。 将“double”转换为“unsigned long long”时使用该函数。 当我看着程序集时，它看起来像它的Wtype_MAXp1_F，它放在GOT中 - 但是为什么？ 我配置了 --target=i386-elf --enable-languages=c --disable-nls --disable-libssp --disable-libquadmath --enable-shared=no --enable-static=yes //C
In a Excel document, there is an option in the insert image dialog box, to insert a "Link to File", where Excel will display the image in the sheet without embedding it. Like this: https://i.stack.imgur.com/AlGbW.png How do I translate that functionality with EpPlus? Note: This is not the same as using the "ws.Drawings.AddPicture()" method as shown below, as the "Ad
在Excel文档中，在插入图像对话框中有一个选项，用于插入“链接到文件”，其中Excel将在图纸中显示图像而不嵌入图像。 像这样：https：//i.stack.imgur.com/AlGbW.png 如何使用EpPlus翻译该功能？ 注意：这与使用下面显示的“ws.Drawings.AddPicture（）”方法不同，因为“AddPicture（）”方法嵌入图像，这不是我想要实现的。 Image logo = Image.FromFile(path); ExcelPackage package = new ExcelPackage(info); var ws = pac
I manually inserted an Image in the top right Header of my Excel file. How do I get it back via excel interop? Background is automatic document validation. This one returned the correct filename (without extension), so i am sure this is the right place: excelApp.ActiveSheet.PageSetup?.RightHeaderPicture However, when iteration through the Images saved in the file, only the Images from the
我手动在我的Excel文件的右上角插入一个图像。 如何通过excel互操作获取它？ 背景是自动文件验证。 这一个返回正确的文件名（没有扩展名），所以我相信这是正确的地方： excelApp.ActiveSheet.PageSetup?.RightHeaderPicture 但是，如果迭代文件中保存的图像，则只会显示单元格中的图像： foreach (var shape in excelApp.ActiveSheet.Shapes) { MessageBox.Show(shape.Name); } 使用excelApp.ActiveSheet.Pictures
Is it possible to create and edit an excel document using OpenXML SDK without creating a local file? As per the documentation the Create method demands for a filepath , which creates a local copy of the file. SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filepath, SpreadsheetDocumentType.Workbook); I'm referring the MSDN article here: https://msdn.microsoft.com/en-u
是否可以使用OpenXML SDK创建和编辑Excel文档而不创建本地文件？ 根据文档， Create方法需要一个文件filepath ，该文件filepath创建该文件的本地副本。 SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filepath, SpreadsheetDocumentType.Workbook); 我在这里引用MSDN文章：https：//msdn.microsoft.com/en-us/library/office/ff478153.aspx 我的要求是创建该文件，并且它应该由浏览器单击按钮下