Are lambda expressions (and to a degree, anonymous functions) closures? My understanding of closures are that they are functions that are treated as objects, which seems to be an accurate representation of what anonymous functions and Lambda expressions do. And is it correct to call them closures? I understand that closures came about (or became popular) due to the lisp dialect, but is it al
lambda表达式（以及一定程度的匿名函数）是否被关闭？ 我对闭包的理解是，它们是被视为对象的函数，它似乎是匿名函数和Lambda表达式的精确表示。 把它们叫做闭包是正确的吗？ 我知道由于lisp方言的缘故，关闭（或者变得流行），但这也是一个普通的编程术语吗？ 感谢您提供的任何澄清！ lambda可以使用闭包实现，但它本身不一定是闭包。 闭包是“一个函数，以及该函数的非局部变量的引用环境。” 当您创建一个使用在方
Possible Duplicate: What is the difference between a 'closure' and a 'lambda'? Hello, World! Forgive me if this is a tad of a newb q, but everyone always gets computersciencey about it.. What actually is a lambda? And what is a Closure? As far as I understand a lambda is an anonymous function and a closure is a pointer to the variables of a lambdas parent scope.. (like
可能重复： '封'和'lambda'有什么区别？ 你好，世界！ 请原谅我，如果这是一个新鲜的q点，但每个人总是得到computerciencey关于它.. 什么是lambda？ 什么是关闭？ 据我所知，一个lambda是一个匿名函数，一个闭包是一个指向lambdas父范围变量的指针..（就像它声明的函数变量的快照） 这有多正确？ 谢谢 丹尼尔 这是完全正确的。 术语闭包描述范围的事物，术语lambda将整个函数描述为一个对象
I have a working program which opens Dialog Boxes(WPF) for User input . Now i want to Refactor and use Toast Notifications. The Notifications need to have the ability of Buttons (Pressing yes or no). The new Win10 interactive Toast Notification seemd perfect. I got the official tutorial from Windows. https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/tiles-and-notifications-s
我有一个工作程序，它打开用户输入的对话框（WPF）。 现在我想要重构并使用Toast Notifications。 通知需要有按钮的能力（按是或否）。 新的Win10互动式Toast Notification看起来很完美。 我从Windows获得官方教程。 https://docs.microsoft.com/en-us/windows/uwp/controls-and-patterns/tiles-and-notifications-send-local-toast 显示Toasts工作正常，但....程序是用C＃编写的Visual Studio WPF应用程序（.NET Framewo
Just started to WPF with C# and VS Community 2017. Tried to run code that will change the start up window. but get the following exception. System.IO.IOException: 'Cannot locate resource 'application_startup'.' this code is from the App.xaml <Application x:Class="StartUp_Window.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.
刚刚开始使用C＃和VS社区2017年WPF。试图运行代码，将改变启动窗口。 但获得以下例外。 System.IO.IOException: 'Cannot locate resource 'application_startup'.' 这段代码来自App.xaml <Application x:Class="StartUp_Window.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:S
I started a blank WPF application (shown below) to implement HockeyApp crash reporting. When the program starts, a window popups up with a single button for the user to press. When the user clicks it the handler attempts to divide by zero and crashes the app. I was receiving crash reports and everything was running smoothly UNTIL I mimicked our bigger system's error catching method, which
我开始了一个空白的WPF应用程序（如下所示）来实现HockeyApp崩溃报告。 当程序启动时，一个窗口弹出一个按钮供用户按下。 当用户点击它时，处理程序尝试除以零并使应用程序崩溃。 我收到崩溃报告，并且一切都运行顺利直到我模仿了我们的大系统的错误捕获方法，即使用DispatcherUnhandledException事件处理程序捕获“未捕获”异常，然后调用System.Environment.Exit（0）以正常方式结束任何内容的背景。 现在HockeyApp api不会
I have a WPF application with which I ask the user some settings to connect to a database, than I connect to the database (using NHibernate) and if everything is right I show my main view. If there is an error in the connection, I'd like to tell the user what is the error and let him retry. Here is some simplified code doing what I want: EDIT : It seems the problem isn't only with N
我有一个WPF应用程序，我要求用户连接到数据库的一些设置，而不是连接到数据库（使用NHibernate），如果一切正常，我显示我的主视图。 如果连接出现错误，我想告诉用户错误是什么，并让他重试。 这里有一些简单的代码正在做我想做的事情： 编辑： 看来问题不仅在于NHibernate。 如果我只是在这里运行简单的应用程序，我会在构造函数中得到未处理的异常。 public partial class App : Application { protected overrid
I have the following code: using (Mutex mut = new Mutex(false, MUTEX_NAME)) { if (mut.WaitOne(new TimeSpan(0, 0, 30))) { // Some code that deals with a specific TCP port // Don't want this to run at the same time in another process } } I've set a breakpoint within the if block, and ran the same code within another instance of Visual Studio. As expected, the .WaitO
我有以下代码： using (Mutex mut = new Mutex(false, MUTEX_NAME)) { if (mut.WaitOne(new TimeSpan(0, 0, 30))) { // Some code that deals with a specific TCP port // Don't want this to run at the same time in another process } } 我在if块中设置了一个断点，并在Visual Studio的另一个实例中运行相同的代码。 正如预期的那样， .WaitOne呼叫会阻止。 但是，令我吃惊的是，只要我继续进
I am trying to use a mutex for the first time and have the following code executing on two separate instances of the program public void asynchronousCode() { using (var mutex = new Mutex(false, "mySpecialMutex")) { if (!mutex.WaitOne(1000, false)) { Console.WriteLine("First check - some one locked the mutex"); }
我正在尝试首次使用互斥锁，并在程序的两个单独实例上执行以下代码 public void asynchronousCode() { using (var mutex = new Mutex(false, "mySpecialMutex")) { if (!mutex.WaitOne(1000, false)) { Console.WriteLine("First check - some one locked the mutex"); } if (!mutex.WaitOne(3000, false)) {
I'm relatively new to C# programming and some days ago, I came across the term mutex . It was used in the sense of avoiding running multiple instances of the same application. I was actually reading a book on WPF (using C#, of course) so there was no deep explanation on C# (the author wrote it for people with sufficient knowledge of C#). It was used in this form: Mutex mutex; // ... //
我对C＃编程比较陌生，几天前我遇到了mutex这个术语。 它被用于避免运行同一应用程序的多个实例。 实际上，我正在阅读一本关于WPF的书（当然使用C＃），所以对C＃没有深入的解释（作者为有足够C＃知识的人写了这本书）。 它以这种形式使用： Mutex mutex; // ... // Check for existing instance string mutexName = "MyCompanyName.MyAppName"; bool createdNew; mutex = new Mutex(true, mutexName, out createdNew); //
This question already has an answer here: Best practices for catching and re-throwing .NET exceptions 11 answers You should always use following syntax to rethrow an exception, else you'll stomp the stack trace: throw; If you print the trace resulting from "throw ex", you'll see that it ends on that statement and not at the real source of the exception. Basically, it sho
这个问题在这里已经有了答案： 捕获和重新抛出.NET异常的最佳实践11个答案 你应该总是使用下面的语法重新抛出一个异常，否则你会踩踏堆栈跟踪： throw; 如果您打印由“throw ex”产生的轨迹，您会看到它以该语句结束，而不是真正的异常源。 基本上，使用“throw ex”应该被视为刑事犯罪。 我的偏好是使用 try { } catch (Exception ex) { ... throw new Exception ("Put more context here", ex) } 这保留了