If I just run one of the async events everything executes exactly as it should be. However, when I add in all 3 of my events, I get (from what I gather) a timeout from my syntax. Here is a full stack-trace that will hopefully assist. System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException:
如果我只运行其中一个异步事件，那么所有事情都会按照它应该执行的那样执行。 但是，当我加入所有3个事件时，我从我的语法中得到（从我所收集的）暂停。 这是一个完整的堆栈跟踪，希望能够提供帮助。 System.Web.HttpUnhandledException（0x80004005）：引发类型'System.Web.HttpUnhandledException'的异常。 ---> System.NullReferenceException：未将对象引用设置为对象的实例.. 在System.Web.UI.Page.d__55
On a ASP.NET MVC action I am trying to return a CSV file with users info: IList<UserModel> users = _repository.GetUsers(); MemoryStream stream = new MemoryStream; using (StreamWriter writer = new StreamWriter(stream)) { using (CsvWriter csv = new CsvWriter(writer)) { csv.Configuration.With(x => { x.AutoMap<UserModel>(); x.RegisterClassMap
在ASP.NET MVC操作上，我试图用用户信息返回一个CSV文件： IList<UserModel> users = _repository.GetUsers(); MemoryStream stream = new MemoryStream; using (StreamWriter writer = new StreamWriter(stream)) { using (CsvWriter csv = new CsvWriter(writer)) { csv.Configuration.With(x => { x.AutoMap<UserModel>(); x.RegisterClassMap<UserModelCsvMap
I am trying to reposition the TabTib keyboard without success the SetWindowPos function returns "True" but the keyboard is not moving. I am using C# on windows 7. ` [DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow); [DllImport("user32.dll")] static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y
我试图重新定位TabTib键盘而没有成功SetWindowPos函数返回“True”，但键盘没有移动。 我在Windows 7上使用C＃。 `[DllImport（“user32.dll”）] public static extern bool ShowWindow（IntPtr hWnd，int nCmdShow）; [DllImport("user32.dll")] static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags); [DllImport("user32.dll")] static ex
The implementation of Enumerable.AsEnumerable<T>(this IEnumerable<T> source) simply returns source . However Observable.AsObservable<T>(this IObservable<T> source) returns an AnonymousObservable<T> subscribing to the source rather than simply returning the source. I understand these methods are really useful for changing the monad within a single query (going from
Enumerable.AsEnumerable<T>(this IEnumerable<T> source)只是返回source 。 然而， Observable.AsObservable<T>(this IObservable<T> source)返回一个订阅源的AnonymousObservable<T> ，而不是简单地返回源。 我知道这些方法对于在单个查询中更改monad非常有用（从IQueryable => IEnumerable）。 那么为什么这些实现有所不同？ Observable版本更具防御性，因为你不能将它转换成某种已知
I've been hearing/reading a lot about covariance issues in C# and I wanted to pose a few questions & scenarios so hopefully I can clear up my confusion on the matter. Throughout these examples, please assume the following is always defined: public class Apple : Fruit {} My first example: IList<Apple> apples = GetApples(); IList<Fruit> fruits = apples; This should work, c
我一直听到/阅读了很多关于C＃中的协变问题的文章，我想提出一些问题和场景，希望我能够澄清我对这个问题的困惑。 在这些例子中，请假定总是定义如下： public class Apple : Fruit {} 我的第一个例子： IList<Apple> apples = GetApples(); IList<Fruit> fruits = apples; 这应该工作，对吗？ 我在C＃中测试了几次，它编译得很好，运行正常（我的第一个示例的测试稍微多于这个，因为我使用多态调用将东西打
I was wondering what is the fastest way to count the number of occurrences of a string (needle) within another string (haystack). The way I'm doing it is: int findWord(char * file, char * word){ char *fptr; char * current = strtok_r(file, " ,.n", &fptr); int sum = 0; while (current != NULL){ //printf("%sn", current); if(strcmp(current, word) == 0) sum+=1; current
我想知道在另一个字符串（干草堆）中计算字符串（针）的出现次数的最快方法是什么。 我这样做的方式是： int findWord(char * file, char * word){ char *fptr; char * current = strtok_r(file, " ,.n", &fptr); int sum = 0; while (current != NULL){ //printf("%sn", current); if(strcmp(current, word) == 0) sum+=1; current = strtok_r(NULL, " ,.n", &fptr); } return sum; } 使
I'm trying to evaluate different substring search (ala strstr) algorithms and implementations and looking for some well-crafted needle and haystack strings that will catch worst-case performance and possible corner-case bugs. I suppose I could work them out myself but I figure someone has to have a good collection of test cases sitting around somewhere... Some thoughts and a partial answer
我试图评估不同的子字符串搜索（ala strstr）算法和实现，并寻找一些制作精良的针和干草堆字符串，以便捕捉最坏情况的性能和可能出现的角落错误。 我想我可以自己解决这个问题，但是我认为有人必须有一个很好的测试用例集合， 对自己的一些想法和部分答案： 蛮力算法的最坏情况： (a^nb)^m a^(n+1) b 如aaab在aabaabaabaabaabaabaab SMOA的最坏情况： 喜欢的东西yxyxyxxyxyxyxx在(yxyxyxxyxyxyxy)^n 。 需要进一步
I recently came across an issue on a website where the styling on a page was really messed up but only in IE. My boss told me it is likely to be because the CSS Bundle being rendered contains CSS files from different directories, so I checked and it did. It was similar to the below: bundles.Add(new StyleBundle("~/path/subpath/all").Include( "~/path/subpath/filename.css",
我最近在一个网站上遇到了一个问题，网页上的样式真的搞砸了，但只在IE中。 我的老板告诉我这很可能是因为被渲染的CSS Bundle包含来自不同目录的CSS文件，所以我查了一下并确实做到了。 它类似于以下内容： bundles.Add(new StyleBundle("~/path/subpath/all").Include( "~/path/subpath/filename.css", "~/path/subpath/filename1.css", "~/path/subpath/filename2.c
I am trying to read the wifi signal continuously to see how wifi signal level is changing for an embedded system. I read several articles in SO on how to read wifi signal level in C# such as this : How often to poll wifi signal strength? but when I am tring to do the same thing, I am always getting the same value. My code is as follow (simplified version): static void Main(string[] arg
我正在尝试连续读取wifi信号，以了解嵌入式系统的wifi信号电平如何变化。 我读过几篇关于如何在C＃中读取wifi信号电平的文章，例如： 多久查询一下wifi信号强度？ 但是当我想要做同样的事情时，我总是获得相同的价值。 我的代码如下（简化版）： static void Main(string[] args) { string selectedSSDID = "BTWiFi"; var client = new WlanClient(); for (int i = 0; i < 1000; i++)
i'm writing a C program to manage certain aspects of a wireless network (Access Point + Client Devices) One Part of the program runs on the Devices an another runs on the AP. The AP is a simple Linux-Station (a Cubietruck, later on exchanged with a Intel Celeron holding Board; Access Point setup with hostapd and dnsmasq) Some features are already implemented. I've done a lot with cfg802
我正在编写一个C程序来管理无线网络的某些方面（接入点+客户端设备）。一部分程序在设备上运行，另一部分在AP上运行。 AP是一个简单的Linux站点（Cubietruck，后来与Intel Celeron控制板交换; Access Point设置为hostapd和dnsmasq）。一些功能已经实现。 我已经使用cfg80211 / nl80211做了很多工作，并且使用了Wext和一些通过BSD套接字的通信例程。 但是现在出现了一个问题。 在接入点上运行的C程序中，我需要关联设备的接