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What's the difference(s) between .ToList(), .AsEnumerable(), AsQueryable()?
... type and the compile-time type are changed.
Let me show this with some examples. I've got this little method that reports the compile-time type and the actual type of an object (courtesy Jon Skeet):
void ReportTypeProperties<T>(T obj)
{
Console.WriteLine("Compile-time type: {0}", typeof...
What is the most efficient way of finding all the factors of a number in Python?
Can someone explain to me an efficient way of finding all the factors of a number in Python (2.7)?
22 Answers
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How do you convert a byte array to a hexadecimal string, and vice versa?
How can you convert a byte array to a hexadecimal string, and vice versa?
45 Answers
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wkhtmltopdf: cannot connect to X server
... using wkthmltopdf to convert html to pdf documents on-the-fly on my linux web server. The program originally needed X11 or similar X server to run correctly, but through many requests by developers to have this run on servers without GUI, I am pretty sure it runs a virtual X server in the stati...
How to efficiently build a tree from a flat structure?
...fic object. Enumerate through all the objects and find their parent if it exists and update its parent pointer accordingly.
class MyObject
{ // The actual object
public int ParentID { get; set; }
public int ID { get; set; }
}
class Node
{
public List<Node> Children = new List<...
Overcoming “Display forbidden by X-Frame-Options”
...amed and throw a "Refused to display document because display forbidden by X-Frame-Options." error in Chrome. I understand that this is a security limitation (for good reason), and don't have access to change it.
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What is the difference between atan and atan2 in C++?
...he sin, cos and tan have the following relationship (where we neglect the exact multiples of π/2):
Quadrant Angle sin cos tan
-------------------------------------------------
I 0 < α < π/2 + + +
II π/2 < α < π +...
Modular multiplicative inverse function in Python
...te modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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How do I rename all files to lowercase?
I have for example TREE.wav, ONE.WAV. I want to rename it to tree.wav, one.wav. How do I rename all files to lowercase?
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Express.js: how to get remote client address
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If you are running behind a proxy like NGiNX or what have you, only then you should check for 'x-forwarded-for':
var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
If the proxy isn't 'yours', I wouldn't trust the 'x-forwarded-for' ...