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c# - Cannot use ref or out parameter in lambda expressions

Why can't you use a ref or out parameter in a lambda expression? I came across the error today and found a workaround but ... Where(a => a == value).First(); } Question&Answers:os...

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How to combine paths in Java?

Is there a Java equivalent for System.IO.Path.Combine() in C#/.NET? Or any code to accomplish this? This static method combines one or more strings into a path. Question&Answers:os...

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security - Encrypting/Hashing plain text passwords in database

I've inherited a web app that I've just discovered stores over 300,000 usernames/passwords in plain text in a ... want to make sure I'm doing this correctly. Question&Answers:os...

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android - AsyncTask won't stop even when the Activity has destroyed

I have an AsyncTask object which starts executing when the Activity is created and does stuff in the ... correct procedure to stop/cancel the AsyncTask. Question&Answers:os...

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android - MapView in a Fragment (Honeycomb)

now that the final SDK is out with google apis - what is the best way to create a Fragment with a ... do this? Thanks and regards from Germany, Valentin Question&Answers:os...

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

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c - How to deal with symbol collisions between statically linked libraries?

One of the most important rules and best practices when writing a library, is putting all symbols of the ... are not allowed to adjust and recompile yourself. Question&Answers:os...

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ios - Handling applicationDidBecomeActive - "How can a view controller respond to the app becoming Active?"

I have the UIApplicationDelegate protocol in my main AppDelegate.m class, with the applicationDidBecomeActive method ... to a method within that controller? Question&Answers:os...

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In C, how should I read a text file and print all strings

I have a text file named test.txt I want to write a C program that can read this file and print the content to ... be larger than that. How can I solve this? Question&Answers:os...

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android - How to execute Async task repeatedly after fixed time intervals

How to make Async task execute repeatedly after some time interval just like Timer...Actually I am ... think is more efficient for android applications. Question&Answers:os...

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Android new Bottom Navigation bar or BottomNavigationView

Saw the new guideline came out, and used in google photos latest app. Have no idea how to use the new Bottom ... Bottom bar? Don't want to do any customize. Question&Answers:os...

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What's the advantage of a Java enum versus a class with public static final fields?

I am very familiar with C# but starting to work more in Java. I expected to learn that enums in Java were ... 's answer is the only one that satisfies this. Question&Answers:os...

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Recursive sub folder search and return files in a list python

I am working on a script to recursively go through subfolders in a mainfolder and build a list off a certain ... suggestions before that. Thanks for your help! Question&Answers:os...

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How to recursively list directories in C on Linux?

I need to recursively list all directories and files in C programming. I have looked into FTW but that is not ... direction on this I would be very grateful. Question&Answers:os...

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javascript - Best Practice: Access form elements by HTML id or name attribute?

As any seasoned JavaScript developer knows, there are many (too many) ways to do the same thing. For example, ... in a non-library solution (jQuery/Prototype). Question&Answers:os...

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

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iphone - "wait_fences: failed to receive reply: 10004003"?

I get this cryptic error the first time (and only the first time) my view is loaded due to the following line ... . This is causing a major headache for me. Question&Answers:os...

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

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How to perform case-insensitive sorting in JavaScript?

I have an array of strings I need to sort in JavaScript, but in a case-insensitive way. How to perform this? Question&Answers:os...

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javascript - Uncaught SyntaxError: Unexpected token with JSON.parse

what causes this error on the third line? var products = [{ "name": "Pizza", "price": "10", "quantity": ... var b = JSON.parse(products); //unexpected token o Question&Answers:os...

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sql - How do you return the column names of a table?

How would I return the column names of a table using SQL Server 2008? i.e. a table contains these columns- id, ... , country and I want to return these as data. Question&Answers:os...

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

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Python: defining my own operators?

I would like to define my own operator. Does python support such a thing? Question&Answers:os...

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Switch statement fallthrough in C#?

Switch statement fallthrough is one of my personal major reasons for loving switch vs. if/else if constructs. ... sort of behaviour without having three ifs? Question&Answers:os...

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

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Why is String.chars() a stream of ints in Java 8?

In Java 8, there is a new method String.chars() which returns a stream of ints (IntStream) that represent the ... was the motivation to design the API this way? Question&Answers:os...

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

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java - && (AND) and || (OR) in IF statements

I have the following code: if(!partialHits.get(req_nr).containsKey(z) || partialHits.get(req_nr).get(z) < tmpmap.get( ... and if a is true in the second case? Question&Answers:os...

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How to write a while loop with the C preprocessor?

I am asking this question from an educational/hacking point of view, (I wouldn't really want to code like ... recursively, so how would this be accomplished? Question&Answers:os...

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c++ - Is the return type part of the function signature?

In C++, is the return type considered part of the function signature? and no overloading is allowed with just return type modified. Question&Answers:os...

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.net - Conditionally use 32/64 bit reference when building in Visual Studio

I have a project that builds in 32/64-bit and has corresponding 32/64-bit dependencies. I want to be able ... and have the referenced DLL be the right bitness. Question&Answers:os...

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Read all worksheets in an Excel workbook into an R list with data.frames

I understand that XLConnect can be used to read an Excel worksheet into R. For example, this would read the first ... to the name of the worksheet in Excel? Question&Answers:os...

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

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JavaScript loop through JSON array?

I am trying to loop through the following json array: { "id": "1", "msg": "hi", "tid": "2013-05-05 23 ... m only getting the first part, id 1 values. Any ideas? Question&Answers:os...

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positioning - jQuery: Difference between position() and offset()

What is the difference between position() and offset()? I tried to do the following in a click event: console. ... element is within a table cell in a table) Question&Answers:os...

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

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