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multithreading - C# Events and Thread Safety

UPDATE As of C# 6, the answer to this question is: SomeEvent?.Invoke(this, e); I frequently hear/read the ... died out, as it should have done in 2005? Question&Answers:os...

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

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Iterating through a range of dates in Python

I have the following code to do this, but how can I do it better? Right now I think it's better than nested loops, ... -06-06 2009-06-07 2009-06-08 2009-06-09 Question&Answers:os...

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

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javascript - Is using 'var' to declare variables optional?

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

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python - Pandas percentage of total with groupby

This is obviously simple, but as a numpy newbe I'm getting stuck. I have a CSV file that contains 3 ... sales for the entire state to calculate the fraction. Question&Answers:os...

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

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php - Creating the Singleton design pattern in PHP5

How would one create a Singleton class using PHP5 classes? Question&Answers:os...

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

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How to use the new SD card access API presented for Android 5.0 (Lollipop)?

Background On Android 4.4 (KitKat), Google has made access to the SD card quite restricted. As of Android ... user replaces the SD card with another one? Question&Answers:os...

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

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C# DLL config file

Im trying to add an app.config file to my DLL, but all attempts have failed. According to MusicGenesis in ' ... console application, it works fine. Any ideas? Question&Answers:os...

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

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sql - How to declare a variable in a PostgreSQL query

How do I declare a variable for use in a PostgreSQL 8.3 query? In MS SQL Server I can do this: DECLARE ... someone give me an example of the correct syntax? Question&Answers:os...

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

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c# - Listen for key press in .NET console app

How can I continue to run my console application until a key press (like Esc is pressed?) I'm assuming its wrapped ... for the key press. How can this be done? Question&Answers:os...

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

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Finding the max/min value in an array of primitives using Java

It's trivial to write a function to determine the min/max value in an array, such as: /** * * @param chars ... max; } but isn't this already done somewhere? Question&Answers:os...

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

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ios - Converting String to Int with Swift

The application basically calculates acceleration by inputting Initial and final velocity and time and then use a ... answer3 = txtBox2 var answer4 = txtBox3 Question&Answers:os...

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

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r - Selecting data frame rows based on partial string match in a column

I want to select rows from a data frame based on partial match of a string in a column, e.g. column 'x' ... doesn't work. Can somebody please help me with this? Question&Answers:os...

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

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printing - multiple prints on the same line in Python

I want to run a script, which basically shows an output like this: Installing XXX... [DONE] Currently, I print ... and [DONE] on the same line. Any ideas? Question&Answers:os...

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

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C compile error: "Variable-sized object may not be initialized"

Why do I receive the error "Variable-sized object may not be initialized" with the following code? int boardAux[length][length] = {{0}}; Question&Answers:os...

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

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Intellij IDEA Maven Import problems

I wanted to switch to IntelliJ for forge modding (minecraft). When I do what they are saying to do on internet, I ... seems to have my problem... help please ? Question&Answers:os...

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

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mingw - Why pow(10,5) = 9,999 in C++

Recently i write a block of code: const int sections = 10; for(int t= 0; t < 5; t++){ int i = ... 1 Does anyone give me an explaination? thanks you very much! Question&Answers:os...

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

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Relational algebra for banking scenario

I don't know how to solve the relational algebra questions. Deposit (Branch, Acc-No, Cust-Name, Balance) Loan (Branch, ... > 2000 ∧ branch = 'Romford' (Loan) ) Question&Answers:os...

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

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r - data.table vs dplyr: can one do something well the other can't or does poorly?

Overview I'm relatively familiar with data.table, not so much with dplyr. I've read through some dplyr vignettes and examples ... ", row.names = c(NA, -16L)) Question&Answers:os...

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

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How to revert multiple git commits?

I have a git repository that looks like this: A <- B <- C <- D <- HEAD I want the head of the branch to ... Do I revert one at a time? Is the order important? Question&Answers:os...

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

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c# - Return anonymous type results?

Using the simple example below, what is the best way to return results from multiple tables using Linq to SQL? ... the select? Or is there another easier way? Question&Answers:os...

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

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sorting - How to sort by two fields in Java?

I have array of objects person (int age; String name;). How can I sort this array alphabetically by name and ... age? Which algorithm would you use for this ? Question&Answers:os...

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

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javascript - Efficiently replace all accented characters in a string?

For a poor man's implementation of near-collation-correct sorting on the client side I need a JavaScript ... this category of problem much more elegantly. 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 parse a string with a decimal point to a double?

I want to parse a string like "3.5" to a double. However, double.Parse("3.5") yields 35 and double. ... may not be formatted as specified in my current locale? Question&Answers:os...

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

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Changing the current working directory in Java?

How can I change the current working directory from within a Java program? Everything I've been able to find ... to open files using relative file paths.... Question&Answers:os...

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

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javascript - Create an object with dynamic property names

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

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java - How to generate exceptions from RepaintManager

In connection with my question (may be), I found another exception type that I not able to catch and print- ... Potochkin, but nothing seems to solve my issues. Question&Answers:os...

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

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php - Should I manually check for errors when calling "mysqli_stmt_prepare"?

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

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What are the various "Build action" settings in Visual Studio project properties and what do they do?

For the most part, you just take whatever Visual Studio sets it for you as a default... I'm referring to the ... to know what each one of them will do. Question&Answers:os...

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

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