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What do two question marks together mean in C#?
...See also ?? Operator - MSDN.
FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();
expands to:
FormsAuth = formsAuth != null ? formsAuth : new FormsAuthenticationWrapper();
which further expands to:
if(formsAuth != null)
FormsAuth = formsAuth;
else
FormsAuth = new FormsAuthentica...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...arent areas take a bigger toll on the GPU to draw, because they need to be mixed with other pixels behind them when displayed. This is why you can mark a UIView as "opaque", to indicate to the GPU that it can just obliterate everything behind that image.
If you have content that is generated dynami...
Graphviz: How to go from .dot to a graph?
...t by varying the value after -T and choosing an appropriate filename extension after -o.
If you're using windows, check out the installed tool called GVEdit, it makes the whole process slightly easier.
Go look at the graphviz site in the section called "User's Guides" for more detail on how to use...
Run JavaScript code on window close or page refresh?
...owser. You can assing them either by setting the window properties to functions, or using the .addEventListener:
window.onbeforeunload = function(){
// Do something
}
// OR
window.addEventListener("beforeunload", function(e){
// Do something
}, false);
Usually, onbeforeunload is used if you...
How do I determine the current operating system with Node.js
... You should use the OS module better, it's even in the documentation. os.platform specifically
– alessioalex
Dec 30 '11 at 20:58
94
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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...支持的方法？什么是无状态？为什么设计成无状态？Session和Cookie是什么关系、什么样的工作原理？看似很简单的问题，其实蕴含着很多知识点，通过“交流”我们会对曾经认为——“我会了”的技术有更加深刻的理解。
提高表...
IBOutlet and IBAction
What is the purpose of using IBOutlets and IBActions in Xcode and Interface Builder?
10 Answers
...
How to convert hashmap to JSON object in Java
...
You can use:
new JSONObject(map);
Caution: This will only work for a Map<String, String>!
Other functions you can get from its documentation
http://stleary.github.io/JSON-java/index.html
...
How do I read and parse an XML file in C#?
...em.Xml.Linq; You'll see the relevant namespace at the top of the documentation, accessible from the docs page the poster linked to e.g. docs.microsoft.com/en-us/dotnet/api/…
– Neek
Sep 21 at 6:59
...
Imitating a blink tag with CSS3 animations
...of text blink the old-school style without using javascript or text-decoration.
9 Answers
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