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c# - What's the difference between returning void and returning a Task?

In looking at various C# Async CTP samples I see some async functions that return void, and others that return ... never return any data. Why not return void? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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387 views

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python - Get list of all routes defined in the Flask app

I have a complex Flask-based web app. There are lots of separate files with view functions. Their URLs are defined ... some method I can call on the app object? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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332 views

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python - Flask ImportError: No Module Named Flask

I'm following the Flask tutorial here: http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i- ... flask which one user mentioned may cause issues. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to update React Context from inside a child component?

I have the language settings in the context as like below class LanguageProvider extends Component { static ... from inside the LanguageSwitcher component ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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242 views

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python - Difference between Variable and get_variable in TensorFlow

As far as I know, Variable is the default operation for making a variable, and get_variable is mainly used ... mechanisms. Are there any "standard" principles? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do I compile a Visual Studio project from the command-line?

I'm scripting the checkout, build, distribution, test, and commit cycle for a large C++ solution that is using Monotone ... make a call to: os.system would do. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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objective c - Is it possible to change a UIButtons background color?

This one has me stumped. Is it possible at all to change the background color of a UIButton in ... [random.titleLabel setBackgroundColor:[UIColor blueColor]]; Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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172 views

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python - Loading initial data with Django 1.7 and data migrations

I recently switched from Django 1.6 to 1.7, and I began using migrations (I never used South). Before 1.7, I ... Django seems to be able to do it natively now. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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685 views

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wcf - Why should a developer use web services instead of direct connections to a db?

Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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258 views

1 answer

ASP.NET MVC Html.ValidationSummary(true) does not display model errors

I have some problem with Html.ValidationSummary. I don't want to display property errors in ValidationSummary. And when ... .ValidationSummary(true)%> <% } %> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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290 views

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java - Why does my Spring Boot App always shutdown immediately after starting?

This is my first Spring Boot code. Unfortunately, it always shuts down. I ... au toconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]] Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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698 views

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concurrency - .NET - Dictionary locking vs. ConcurrentDictionary

I couldn't find enough information on ConcurrentDictionary types, so I thought I'd ask about it here. ... Reference to .NET 4.0's ConcurrentDictionary Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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218 views

1 answer

reactjs - What is the best way to redirect a page using React Router?

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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272 views

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css - Fixed element disappears in Chrome

When scrolling on a website I've built, using the CSS property position: fixed works as expected to keep a ... bottom: 0; and that works as expected. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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345 views

1 answer

how to upload multiple images to a blog post in django

I am trying to allow each user to upload multiple pictures to a single blog post. I have been trying to ... is scalable. Any help would be much appreciated! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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259 views

1 answer

Specify multiple attribute selectors in CSS

What is the syntax for doing something like: input[name="Sex" AND value="M"] Basically, I want to select the input ... type="radio" name="Sex" value="F" /> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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307 views

1 answer

java - Replacing all non-alphanumeric characters with empty strings

I tried using this but didn't work- return value.replaceAll("/[^A-Za-z0-9 ]/", ""); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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115 views

1 answer

How do I create an average from a Ruby array?

How would get find an average from an array? If I have the array: [0,4,8,2,5,0,2,6] Averaging would give me 3.375. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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122 views

1 answer

c# - Replace only some groups with Regex

Let's suppose I have the following regex: -(d+)- and I want to replace, using C#, the Group 1 (d+) ... replace only groups, and keep the rest of the match. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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command line - How do I get the name of the current executable in C#?

I want to get the name of the currently running program, that is the executable name of the program. In C/C++ you get it from args[0]. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

1 answer

javascript - How to ensure a <select> form field is submitted when it is disabled?

I have a select form field that I want to mark as "readonly", as in the user cannot modify the ... of the disabled dropdown menus before submitting the form. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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271 views

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python - List all base classes in a hierarchy of given class?

Given a class Foo (whether it is a new-style class or not), how do you generate all the base classes - anywhere in the inheritance hierarchy - it issubclass of? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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262 views

1 answer

iphone - UIDatePicker pop up after UIButton is pressed

How can I make a UIDatePicker pop up (animated) after a UIButton is pressed, and then close down again once the date is selected? This is on the iPhone. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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102 views

1 answer

sql - How to create relationships in MySQL

In class, we are all 'studying' databases, and everyone is using Access. Bored with this, I am trying to do ... ' one customer_id (to indicate who owns it). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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173 views

1 answer

android - One Activity and all other Fragments

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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136 views

1 answer

Use Xcode 7 with iOS 10

I want to use Xcode 7 with iOS 10. As I understand, working with iOS 10 beta requires Xcode 8 beta, so I ... to stay with Xcode 7. How can I achieve that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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466 views

1 answer

mysql - How to store uuid as number?

Based on the answer of question, UUID performance in MySQL, the person who answers suggest to store UUID as a ... something? How my ruby code deal with that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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200 views

1 answer

javascript - $watch an object

I want to watch for changes in a dictionary, but for some reason watch callback is not called. Here is a controller ... . What is the correct way to do it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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