structure | 易学教程

Convert nested for-loops into single LINQ statement

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can someone please help me turn this nested structure into a single LINQ statement? EventLog[] logs = EventLog.GetEventLogs(); for (int i = 0; i < logs.Length; i++) { if (logs[i].LogDisplayName.Equals("AAA")) { for (int j = 0; j < logs[i].Entries.Count; j++) { if (logs[i].Entries[j].Source.Equals("BBB")) { remoteAccessLogs.Add(logs[i].Entries[j]); } } } } Nested loops usually end up with multiple "from" clauses (which are converted into calls to SelectMany by the compiler): var remoteAccessLogs = from log in EventLogs.GetEventLogs() where log.LogDisplayName == "AAA" from entry in log.Entries

Is it compulsory to learn about Data Structures if you want to be a Java/C++ programmer? [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . So do I really need to learn about them ? Isn't there an interesting way to learn about stacks, linked lists, heaps, etc ? I found it

Is there a way to access individual bits with a union?

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问题 I am writing a C program. I want a variable that I can access as a char but I can also access the specific bits of. I was thinking I could use a union like this... typedef union { unsigned char status; bit bits[8]; }DeviceStatus; but the compiler doesn't like this. Apparently you can't use bits in a structure. So what can I do instead? 回答1: Sure, but you actually want to use a struct to define the bits like this typedef union { struct { unsigned char bit1 : 1; unsigned char bit2 : 1; unsigned

input_event structure description (from linux/input.h)

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问题 Can someone please tell me what are the properties of the datatypes used by the input_event structure? It is defined as follows in the input.h file: struct input_event { struct timeval time; __u16 type; __u16 code; __s32 value; }; but there are no other descriptions! Even googling gave me nothing interesting. The only thing I know is that time gives seconds or miliseconds from epoch and value gives code of pressed button. But even value of value property isn't really clear for me. In my

Compare structures of two databases?

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问题 I wanted to ask whether it is possible to compare the complete database structure of two huge databases. We have two databases, the one is a development database, the other a production database. I've sometimes forgotten to make changes in to the production database, before we released some parts of our code, which results that the production database doesn't have the same structure, so if we release something we got some errors. Is there a way to compare the two, or synchronize? 回答1: What

What is so special about Monads?

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问题 A monad is a mathematical structure which is heavily used in (pure) functional programming, basically Haskell. However, there are many other mathematical structures available, like for example applicative functors, strong monads, or monoids. Some have more specific, some are more generic. Yet, monads are much more popular. Why is that? One explanation I came up with, is that they are a sweet spot between genericity and specificity. This means monads capture enough assumptions about the data

How to Break knockout view model in parts with requirejs

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问题 I am currently working on an application which is enlarging itself due to so much functionality. Here i am going to present some sample code to understand. function test(){ var self = this /* Define Properties */ self.TaskSection = ko.observable() . . /* Define Get Requrest */ self.GetTasks = function(){ } . . /* Define Post Requrest */ self.PostTask = function(){ } . . /* Define Helper Methods */ self.FormatDate = function(){ } . . /* Define Navigation Methods */ self.HomePage = function(){

Writing Structs to a file in c [closed]

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问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . Is it possible to write an entire struct to a file example: struct date { char day[80]; int month; int year; }; 回答1: Is it possible to write an entire struct to a file Your question is actually writing struct

Looping Forever in a Windows Forms Application

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I am using Visual C# sand I'm using a Windows Form rather than a console application. Therefore I'm not working in Main (), but rather in the Form File. I'm also very new to C# so sorry if some of my questions are stupid. What I basically need to do is when my program starts up I need it to keep looping forever. Where would I put this code since I don't have a Main ()? Do I put it in the function that has InitializeComponent() in it? I need the loop to start right after the program starts. However, I have some variables that I need declared first before the loop. So basically I need the

Is there a tool for Django project structure/information flow visualization?

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I would like to be able to view the structure of my Django project, i.e. which urls point to which views, which views point to which templates, which css files are included in which templates etc. I know about the great model visualization tool in Django command extensions , but I need a different tool that is able to visualize links between: Urls and views; Views and templates; Templates and other templates (via {% extends %} , {% include %} and custom template tags); Templates and static files (css, js, images). Are there any? It is impossible to create tools which you are looking for that