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HTML5 Video Dimensions
...--- //
/**
Returns the dimensions of a video asynchrounsly.
@param {String} url Url of the video to get dimensions from.
@return {Promise} Promise which returns the dimensions of the video in 'width' and 'height' properties.
*/
function getVideoDimensionsOf(url){
return new Promise(fun...
Group by with multiple columns using lambda
...private class CustomerGroupingKey
{
public CustomerGroupingKey(string country, string gender)
{
Country = country;
Gender = gender;
}
public string Country { get; }
public string Gender { get; }
}
...
How to get correct timestamp in C#
...rect syntax to get current date and time is DateTime.Now, so change this:
String timeStamp = GetTimestamp(new DateTime());
to this:
String timeStamp = GetTimestamp(DateTime.Now);
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Convert dictionary to list collection in C#
...
Alternatively:
var keys = new List<string>(dicNumber.Keys);
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Case insensitive access for generic dictionary
...
There's no way to specify a StringComparer at the point where you try to get a value. If you think about it, "foo".GetHashCode() and "FOO".GetHashCode() are totally different so there's no reasonable way you could implement a case-insensitive get on a c...
C#/Linq: Apply a mapping function to each element in an IEnumerable?
...int> integers = new List<int>() { 1, 2, 3, 4, 5 };
IEnumerable<string> strings = integers.Select(i => i.ToString());
Or in LINQ syntax:
IEnumerable<int> integers = new List<int>() { 1, 2, 3, 4, 5 };
var strings = from i in integers
select i.ToString();...
How to pass a class type as a function parameter
... the types in the method call:
class func invokeService<T>(service: String, withParams params: Dictionary<String, String>, returningClass: T.Type, completionHandler handler: ((T) -> ())) {
// The compiler correctly infers that T is the class of the instances of returningClass
...
Try-catch speeding up my code?
... I’ve always wondered why the C# compiler generates so many extraneous locals. For example, new array initialisation expressions always generate a local, but is never necessary to generate a local. If it allows the JITter to produce measurably more performant code, perhaps the C# comp...
Showing a Spring transaction in log
...d out, getSpringTransactionInfo() is called and it returns a one-character string that will go into the log.
References:
Tips for Debugging Spring's @Transactional Annotation
org.springframework.transaction.support.TransactionSynchronizationManager
java.lang.ThreadLocal
java.lang.Class.getMethod(...
Lock, mutex, semaphore… what's the difference?
...ic static Semaphore Bouncer { get; set; }
public static void Main(string[] args)
{
// Create the semaphore with 3 slots, where 3 are available.
Bouncer = new Semaphore(3, 3);
// Open the nightclub.
OpenNightclub();
}
...