大约有 30,000 项符合查询结果（耗时：0.0435秒） [XML]
Can “this” ever be null in Java?
...ng the method, but the real story is that there is no method to attempt to call.
– Claudiu
Sep 24 '10 at 17:34
5
...
How do I get my C# program to sleep for 50 msec?
...
After calling sleep in a method, will the program continue to execute in the background(without creating new thread)? Also, if i call sleep in a new thread, will the main thread continue its work?
– Jay Nirgud...
Why must a lambda expression be cast when supplied as a plain Delegate parameter
... with less opportunity for error checking.
If you want to make it easy to call Control.Invoke with an Action the easiest thing to do is add an extension method to Control:
public static void Invoke(this Control control, Action action)
{
control.Invoke((Delegate) action);
}
...
How to validate an email address in JavaScript
Is there a regular expression to validate an email address in JavaScript?
95 Answers
9...
Limit file format when using ?
...still, the accept attribute of <input type = "file"> can help to provide a filter in the file select dialog box of the OS. For example,
<!-- (IE 10+, Edge (EdgeHTML), Edge (Chromium), Chrome, Firefox 42+) -->
<input type="file" accept=".xls,.xlsx" />
should provide a way ...
How to develop Desktop Apps using HTML/CSS/JavaScript? [closed]
...p dev. Also you may have a look at Chromium Embedded Framework. It's basically a web browser control based on chromium.
It's written in C++ so you can do all the low level OS stuff you want(Growl, tray icons, local file access, com ports, etc) in your container app, and then all the application l...
JavaScript global event mechanism
...l error handling facility in JavaScript? The use case is catching function calls from flash that are not defined.
10 Answer...
jQuery .each() index?
...0px;
}
.container {
display: flex;
}
.one,
.two,
.three {
width: 33.3%;
}
.one {
background: yellow;
text-align: center;
}
.two {
background: pink;
}
.three {
background: darkgray;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.m...
When is it better to use String.Format vs string concatenation?
.../readability) for me is using string concatenation, without any ToString() calls
if you're after performance, make the ToString() calls yourself to avoid boxing (I'm somewhat biased towards readability) - same as first option in your question
if you're showing localized strings to the user (not the ...
Pinging servers in Python
...hon 2 and Python 3
EDITS:
By @radato os.system was replaced by subprocess.call. This avoids shell injection vulnerability in cases where your hostname string might not be validated.
import platform # For getting the operating system name
import subprocess # For executing a shell command
def p...