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c# - Overriding vs method hiding

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

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oop - How can I create a copy of an object in Python?

I would like to create a copy of an object. I want the new object to possess all properties of the old ... the old object should not be affected by that. Question&Answers:os...

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

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php - isset() and empty() - what to use

Could you help me to improve my coding style?:) In some tasks I need to check - is variable empty or contains ... () before empty() - is it necessary? TIA! Question&Answers:os...

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

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How to pause for specific amount of time? (Excel/VBA)

I have an Excel worksheet that has the following macro. I'd like to loop it every second but danged if I can ... I want to wait for one second Loop End Sub Question&Answers:os...

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

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sql - Subquery using Exists 1 or Exists *

I used to write my EXISTS checks like this: IF EXISTS (SELECT * FROM TABLE WHERE Columns=@Filters) BEGIN ... =@Filters END Does this really make a difference? Question&Answers:os...

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

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c# - Truncate Two decimal places without rounding

Lets say I have a value of 3.4679 and want 3.46, how can I truncate to two decimal places that without rounding up? ... (Math.Round(3.46799999999 -.005 , 2)); } Question&Answers:os...

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

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c# - Append lines to a file using a StreamWriter

I want to append lines to my file. I am using a StreamWriter: StreamWriter file2 = new StreamWriter(@"c: ... let the StreamWriter append to an existing file? Question&Answers:os...

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

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dependency management - Javascript require() function giving ReferenceError: require is not defined

Basically, I am using javascript to scrape data from Google Play store using: 1-Request 2-Cheerios 3-QueryString I ... or this is something out of the ordinary. Question&Answers:os...

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

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How to get a slice as an array in Rust?

I have an array of an unknown size, and I would like to get a slice of that array and convert it to a statically ... found slice `[u8]` } How would I do this? Question&Answers:os...

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

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wpf - How do you bind a CollectionContainer to a collection in a view model?

I have a view model with a property that exposes a collection of things. I have a ComboBox whose ItemsSource property is bound ... Name="Jason" /> <Hero Name="Hercules" /> <Hero...

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

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android - Error:Execution failed for task ':app:transformClassesWithDexForDebug'

The error Error:Execution failed for task ':app:transformClassesWithDexForDebug'. com.android.build.transform.api. ... resolve this error. Much thanks! Question&Answers:os...

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

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C# variable scoping: 'x' cannot be declared in this scope because it would give a different meaning to 'x'

if(true) { string var = "VAR"; } string var = "New VAR!"; This will result in: Error 1 A local ... because the first var has no relevance in the second scope. Question&Answers:os...

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

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r - Add row to a data frame with total sum for each column

I have a data frame where I would like to add an additional row that totals up the values for each column. For ... columns. What's a better way to do this? Question&Answers:os...

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

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Java random numbers using a seed

This is my code to generate random numbers using a seed as an argument: double randomGenerator(long seed) { Random ... are the same. How can I fix this? Question&Answers:os...

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

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Java generating non-repeating random numbers

I want to create a set of random numbers without duplicates in Java. For example I have an array to store 10, ... I make sure the random numbers do not repeat? Question&Answers:os...

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

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python - Confused about backslashes in regular expressions

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

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r - What is the difference between `%in%` and `==`?

df <- structure(list(x = 1:10, time = c(0.5, 0.5, 1, 2, 3, 0.5, 0.5, 1, 2, 3)), .Names = c( ... .5 ## 10 10 3.0 What is the difference between %in% and == here? Question&Answers:os...

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

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Parsing date/time string with timezone abbreviated name in Python?

I'm trying to parse timestamp strings like "Sat, 11/01/09 8:00PM EST" in Python, but I'm having trouble finding ... timezone. Is there an easy way to do this? Question&Answers:os...

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

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uninstallation - Perform a task on uninstall in android

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

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Processing large JSON files in PHP

I am trying to process somewhat large (possibly up to 200M) JSON files. The structure of the file is basically ... on how to deal with this problem best? Question&Answers:os...

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

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c++11 - OpenGL object in C++ RAII class no longer works

I have an OpenGL object in a C++ class. Since I'm employing RAII, I want to have the destructor ... attempt to build a canonical answer to these questions. Question&Answers:os...

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

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367 views

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excel - Last non-empty cell in a column

Does anyone know the formula to find the value of the last non-empty cell in a column, in Microsoft Excel? Question&Answers:os...

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

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378 views

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c# - Making a Simple Ajax call to controller in asp.net mvc

I'm trying to get started with ASP.NET MVC Ajax calls. Controller: public class AjaxTestController : ... "chamara", JsonRequestBehavior.AllowGet); } } Question&Answers:os...

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

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.net - printing all contents of array in C#

I am trying to print out the contents of an array after invoking some methods which alter it, in Java I use: System.out. ... alg.id)); how do I do this in c#? Question&Answers:os...

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

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boolean - PHP - Get bool to echo false when false

The following code doesn't print out anything: $bool_val = (bool)false; echo $bool_val; But the following code ... is false than adding an if statement? Question&Answers:os...

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

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103 views

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Visual Studio support for new C / C++ standards?

I keep reading about C99 and C++11 and all these totally sweet things that are getting added to the language ... 02/22/tr1-slide-decks/ Very useful. Thanks! Question&Answers:os...

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

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101 views

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java - Call an executable and pass parameters

I'm figuring out a mechanism to call an exe from Java and passing in specific parameters. How can I do? ... C:\User\My applications\MyExe.exe Thank you. Question&Answers:os...

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

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190 views

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javascript - Appending HTML string to the DOM

How to append a HTML string such as var str = '<p>Just some <span>text</span> here</p>'; to the <div> ... test? (Btw div.innerHTML += str; is not acceptable.) Question&Answers:os...

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

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