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c# - How can I format a nullable DateTime with ToString()?

How can I convert the nullable DateTime dt2 to a formatted string? DateTime dt = DateTime.Now; Console. ... method ToString takes one argument See Question&Answers more detail:os...

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

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performance - Are Java static calls more or less expensive than non-static calls?

Is there any performance benefit one way or another? Is it compiler/VM specific? I am using Hotspot. See Question&Answers more detail:os...

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

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How are firstprivate and lastprivate different than private clauses in OpenMP?

I've looked at the official definitions, but I'm still quite confused. firstprivate: Specifies that each ... started learning OpenMP today. See Question&Answers more detail:os...

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

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macos - sed -i command for in-place editing to work with both GNU sed and BSD/OSX

I've got a makefile (developed for gmake on Linux) that I'm attempting to port to MacOS, but it seems like sed ... but I can't see the solution. See Question&Answers more detail:os...

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

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c# - Determine assembly version during a post-build event

Let's say I wanted to create a static text file which ships with each release. I want the file to be updated ... achieve this that I've missed? See Question&Answers more detail:os...

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

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c - Passing struct to function

I'm a new C programmer and I wanted to know how I can pass a struct through to a function. I'm ... argument #1 is incompatible with prototype: See Question&Answers more detail:os...

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

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Rotate a Matrix in R by 90 degrees clockwise

I have a matrix in R like this: |1|2|3| |1|2|3| |1|2|3| Is there an easy way to rotate the entire matrix by 90 ... |2|1| |3|2|1| |3|2|1| ? See Question&Answers more detail:os...

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

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java - Tomcat Guice/JDBC Memory Leak

I'm experiencing a memory leak due to orphaned threads in Tomcat. Particularly, it seems that Guice and the ... Any help would be appreciated! See Question&Answers more detail:os...

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

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How do I concatenate strings in Swift?

How to concatenate string in Swift? In Objective-C we do like NSString *string = @"Swift"; NSString *resultStr ... do this in Swift-language. See Question&Answers more detail:os...

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

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c - Traverse Matrix in Diagonal strips

I thought this problem had a trivial solution, couple of for loops and some fancy counters, but apparently it ... code duplication is ideal. See Question&Answers more detail:os...

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

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visual studio - How to turn off CodeLens-References

I recently installed Visual Studio 2013 Ultimate. Now, as you know, there is this "n references" above all methods. ... So how can I disable it? See Question&Answers more detail:os...

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

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Declare and Initialize String Array in VBA

This should work according to another stack overflow post but its not: Dim arrWsNames As String() = {"Value1", " ... let me know what is wrong? See Question&Answers more detail:os...

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

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python - Where is pip cache folder?

Where is Python pip cache folder? I had an error during install and now reinstall packages using cache files. ... directory or will remove soon? See Question&Answers more detail:os...

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

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java - Prevent WebView from displaying "web page not available"

I have an app that makes extensive use of a WebView. When the user of this app does not have Internet ... doesn't actually clear the view. See Question&Answers more detail:os...

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

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Run Android studio emulator on AMD processor

Android newbie. My processor is AMD, not Intel, so I can't open the emulator in Android studio. This ... Android Studio emulator and AMD CPU See Question&Answers more detail:os...

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

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iphone - What is the difference between Objective-C automatic reference counting and garbage collection?

With the new automatic reference counting (ARC) introduced in Xcode 4.2, we no longer need to manually ... ARC differ from garbage collection? See Question&Answers more detail:os...

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

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java - Which loop has better performance? Why?

String s = ""; for(i=0;i<....){ s = some Assignment; } or for(i=0;i<..){ String s = ... memory management. Just want to know which is better. See Question&Answers more detail:os...

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

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layout - Android: why is there no maxHeight for a View?

View's have a minHeight but somehow are lacking a maxHeight: What I'm trying to achieve is having some ... have a maxHeight implemented.) See Question&Answers more detail:os...

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

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c# - Copy files to output directory using csproj dotnetcore

So my issue is pretty simple. I have some files that I want to be copied to the build output directory ... using the csproj with dotnetcore? See Question&Answers more detail:os...

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

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mongodb - mongo group query how to keep fields

Everybody. In mongo group query, the result shows only the key(s) in arguments. How to keep the first document in each ... ", "count" : 1 } ] See Question&Answers more detail:os...

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

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python - Should __ne__ be implemented as the negation of __eq__?

I have a class where I want to override the __eq__ method. It seems to make sense that I should override the ... : return not self.__eq__(other) See Question&Answers more detail:os...

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

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python - pandas multiprocessing apply

I'm trying to use multiprocessing with pandas dataframe, that is split the dataframe to 8 parts. apply some function to ... id'], big_df['id']) See Question&Answers more detail:os...

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

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sql - MySQL combine two columns and add into a new column

I have the following structure with a MySQL table: +----------------+----------------+- ... the table without destroying the original 3 fields. See Question&Answers more detail:os...

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

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sql server - T-SQL: Selecting Column Based on MAX(Other Column)

I'm hoping there's a simple way to do this without using a sub-query: Scenario: You have "TableA" with ... = (subselect for max subkey)'? See Question&Answers more detail:os...

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

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android - How to exit when back button is pressed?

When a user presses the back button on an intent, the application should quit. How can I ensure the application ... the back button is pressed? See Question&Answers more detail:os...

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

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java - How to set JAVA_HOME in Mac permanently?

I am trying to set JAVA_HOME by entering export JAVA_HOME=/Library/Java/Home at terminal. It sets the JAVA_HOME ... can I set it permanently? See Question&Answers more detail:os...

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

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download only audio from youtube video using youtube-dl in python script

There's a few posts on downloading audio from YouTube using youtube-dl, but none of them are concrete or ... suggestions how to script this? See Question&Answers more detail:os...

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

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jquery - How to fix a header on scroll

I am creating a header that once scrolled to a certain amount of pixels it fixes and stays in place. Can ... background:orange; postion:fixed; } See Question&Answers more detail:os...

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

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