大约有 30,000 项符合查询结果（耗时：0.0551秒） [XML]
What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
...on instead of returning false.
Using ContainsKey followed by the Item basically duplicates the lookup functionality, which is the bulk of the computation in this case.
share
|
improve this answer
...
Generate a random point within a circle (uniformly)
...but you can give a guarantee on how long it'll take, and how many random() calls it needs, unlike rejection sampling.
t = 2*pi*random()
u = random()+random()
r = if u>1 then 2-u else u
[r*cos(t), r*sin(t)]
Here it is in Mathematica.
f[] := Block[{u, t, r},
u = Random[] + Random[];
t = Ran...
Passing Objects By Reference or Value in C#
...ssed, by value, as the initial value of the parameter of the method you're calling. Now the important point is that the value is a reference for reference types - a way of getting to an object (or null). Changes to that object will be visible from the caller. However, changing the value of the param...
Rails 4: how to use $(document).ready() with turbo-links
...
I can confirm that the ready function does not get called twice. If it's a hard refresh, only the ready event is fired. If it's a turbolinks load, only the page:load event is fired. It's impossible for both ready and page:load to be fired on the same page.
...
How to use NSURLConnection to connect with SSL for an untrusted cert?
...eep only the useCendential part in the didReceiveAuthentificationChallenge callback if you want to accept any https site.
– yonel
Jan 27 '10 at 10:40
...
WebSockets vs. Server-Sent events/EventSource
...SEs have been kept in the shadow is because later APIs like WebSockets provide a richer protocol to perform bi-directional, full-duplex communication. Having a two-way channel is more attractive for things like games, messaging apps, and for cases where you need near real-time updates in both direct...
Storing WPF Image Resources
...
Would it be possible to do this dynamically? If I have a differing number of images that I would like to load on start-up, could I create a BitmapSource per image and refer to them the same way as above?
– Becky Franklin
Aug...
UIRefreshControl without UITableViewController
...ing a UIRefreshControl instance as a subview to my UITableView. And it magically just works!
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
[self.myTableView addSubview...
Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
...) ) -- text to be inserted
)
One should note that the convert() calls should specify an [n]varchar of sufficient length to hold the converted result with truncation.
share
|
improve this ...
What is the best way to clone/deep copy a .NET generic Dictionary?
... copy to be, and what version of .NET are you using? I suspect that a LINQ call to ToDictionary, specifying both the key and element selector, will be the easiest way to go if you're using .NET 3.5.
For instance, if you don't mind the value being a shallow clone:
var newDictionary = oldDictionary....