大约有 2,500 项符合查询结果（耗时：0.0158秒） [XML]
C# 4.0: Can I use a TimeSpan as an optional parameter with a default value?
...se at compile time, the compiler can't simply execute TimeSpan.FromSeconds(2.0) and stick the bytes of the result into your compiled code.
As an example, consider if you tried to use DateTime.Now instead. The value of DateTime.Now changes every time it's executed. Or suppose that TimeSpan.FromSecon...
How to recursively delete an entire directory with PowerShell 2.0?
What is the simplest way to forcefully delete a directory and all its subdirectories in PowerShell? I am using PowerShell V2 in Windows 7.
...
UIButton: how to center an image and a text using imageEdgeInsets and titleEdgeInsets?
...clipping
CGFloat edgeOffset = fabsf(titleSize.height - imageSize.height) / 2.0;
button.contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0);
Swift 5.0 version
extension UIButton {
func alignVertical(spacing: CGFloat = 6.0) {
guard let imageSize = imageView?.image?.size,
...
How to convert a PNG image to a SVG? [closed]
...nm # PNG to PNM
potrace file.pnm -s -o file.svg # PNM to SVG
Explain options
potrace -s => Output file is SVG
potrace -o file.svg => Write output to file.svg
Example
Input file = 2017.png
convert 2017.png 2017.pnm
Temporary file = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
...
How to capitalize the first letter in a String in Ruby
...want it to, it outputs мария instead of Мария.
If you're using Rails there's an easy workaround:
"мария".mb_chars.capitalize.to_s # requires ActiveSupport::Multibyte
Otherwise, you'll have to install the unicode gem and use it like this:
require 'unicode'
Unicode::capitalize("м...
Views vs Components in Ember.js
...ber.Component.
Hope it helps.
Update
With the publication of Road to Ember 2.0 you are now encouraged to use Components instead of Views in most of the cases.
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Detecting iOS / Android Operating system
...dow.opera;
// Windows Phone must come first because its UA also contains "Android"
if (/windows phone/i.test(userAgent)) {
return "Windows Phone";
}
if (/android/i.test(userAgent)) {
return "Android";
}
// iOS detection from: http://stackoverflow.com/a/90...
Get the length of a String
...
TLDR:
For Swift 2.0 and 3.0, use test1.characters.count. But, there are a few things you should know. So, read on.
Counting characters in Swift
Before Swift 2.0, count was a global function. As of Swift 2.0, it can be called as a member fu...
DateTime “null” value
...
If you're using .NET 2.0 (or later) you can use the nullable type:
DateTime? dt = null;
or
Nullable<DateTime> dt = null;
then later:
dt = new DateTime();
And you can check the value with:
if (dt.HasValue)
{
// Do something wit...
How to find the .NET framework version of a Visual Studio project?
....Net 1.0
In 2003, all projects use .Net 1.1
In 2005, all projects use .Net 2.0
In 2008, projects use .Net 2.0, 3.0, or 3.5; you can change the version in Project Properties
In 2010, projects use .Net 2.0, 3.0, 3.5, or 4.0; you can change the version in Project Properties
In 2012, projects use .Net 2...