大约有 45,000 项符合查询结果（耗时：0.0800秒） [XML]
new DateTime() vs default(DateTime)
...s must be compile-time constants, which MinValue is not. default(DateTime) and new DateTime() are both valid though.(which is actually funny, because const DateTime x = default(DateTime) is not valid, since DateTime values cannot be declared as compile-time constants)
– Jerri K...
Looping through a hash, or using an array in PowerShell
...
Christian's answer works well and shows how you can loop through each hash table item using the GetEnumerator method. You can also loop through using the keys property. Here is an example how:
$hash = @{
a = 1
b = 2
c = 3
}
$hash.Keys | % { "...
Checking if a double (or float) is NaN in C++
...
According to the IEEE standard, NaN values have the odd property that comparisons involving them are always false. That is, for a float f, f != f will be true only if f is NaN.
Note that, as some comments below have pointed out, not all compilers ...
BLE（四）嗅探工具 - 创客硬件开发 - 清泛IT社区，为创新赋能！
文章源自：https://www.gandalf.site/2018/11/ble_26.html
商业级的Ellisys BEX400侦听工具最为符合对BLE流量捕获及分析的要求，然而售价过于昂贵；
其次，作为开源硬件且配有混杂模式追踪的“超牙”设备——Ubertooth One拥有二次开发和嗅...
Git push to wrong branch
Working with git, after some 'commit', and a couple of 'push', I realized that am using the wrong branch !
3 Answers
...
How to execute maven plugin execution directly from command line?
I have a plugin (antrun) with an execution configured which has an id and is not bound to any phase. Can I execute this execution directly from the command line?
...
Suppress echo of command invocation in makefile?
...le which when invoked as make run > outputFile should run the program and write the output to a file, which has a SHA1 fingerprint identical to the one given in the spec.
...
What is the difference between isinstance('aaa', basestring) and isinstance('aaa', str)?
...ython versions prior to 3.0 there are two kinds of strings "plain strings" and "unicode strings". Plain strings (str) cannot represent characters outside of the Latin alphabet (ignoring details of code pages for simplicity). Unicode strings (unicode) can represent characters from any alphabet includ...
How to draw a path on a map using kml file?
Can I parse kml file in order to display paths or points in Android? Please could you help me with that?
4 Answers
...
Getting a 'source: not found' error when using source in a bash script
...
In the POSIX standard, which /bin/sh is supposed to respect, the command is . (a single dot), not source. The source command is a csh-ism that has been pulled into bash.
Try
. $env_name/bin/activate
Or if you must have non-POSIX bash-is...