大约有 32,000 项符合查询结果（耗时：0.0466秒） [XML]
Open a folder using Process.Start
...
Small difference if that explorer window is already open: Process.Start(path) activates the window (may only blink in task bar, not brought to front); explorer.exe+parameter opens a new window always in the front (but multiple...
Get a random item from a JavaScript array [duplicate]
... not a valid substitution for Math.floor. Using round would cause accidentally referencing an undefined index, say in the case Math.random() is 0.95 and items.length is 5. Math.round(0.95*5) is 5, which would be an invalid index. floor(random) will always be zero in your example.
...
Python Empty Generator Function
... list(f())
[None]
Why not just use iter(())?
This question asks specifically about an empty generator function. For that reason, I take it to be a question about the internal consistency of Python's syntax, rather than a question about the best way to create an empty iterator in general.
If ques...
How to get the Power of some Integer in Swift language?
...
I really like this solution, but with Swift 3 it does not work. Any idea how to make it work?
– Vanya
Sep 19 '16 at 18:51
...
String was not recognized as a valid DateTime “ format dd/MM/yyyy”
...
You need to call ParseExact, which parses a date that exactly matches a format that you supply.
For example:
DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);
The IFormatProvider parameter spe...
Finding the direction of scrolling in a UIScrollView?
I have a UIScrollView with only horizontal scrolling allowed, and I would like to know which direction (left, right) the user scrolls. What I did was to subclass the UIScrollView and override the touchesMoved method:
...
What is the purpose of a question mark after a type (for example: int? myVariable)?
Typically the main use of the question mark is for the conditional, x ? "yes" : "no" .
8 Answers
...
JSONP with ASP.NET Web API
...ms to be ok, but because the service exists on a separate site, trying to call it with JQuery errors with the "Not Allowed". So, this is clearly a case where I need to use JSONP.
...
How can I String.Format a TimeSpan object with a custom format in .NET?
...drei Rinea: Correct, as stated at the start of my second paragraph ".Net 4 allows you to use custom format strings with Timespan".
– Doctor Jones
Jul 13 '11 at 9:49
1
...
How can I convert a DateTime to the number of seconds since 1970?
...he number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001.
...