Browse questions answered by Jon Skeet

Forcing C#'s HTTP Response to Return a Status Code Instead of a Description

I am currently using this script to get HTTP response headers. public static List<string> GetHttpResponseHeaders(string url) { List<string> headers = new...

With that said, it appears that StatusCode() doesn't actually return a "status code," and on successful requests, it only returns an OK instead of a 200. No, it returns an HttpStatusCode enum value. If you call ToString on an enum... more 2/6/2014 3:59:01 PM

Casting to custom type, Enumerable.Cast<T> and the as keyword

This is more a question out of curiosity than necessity and came about having had to deal with Active Directory (MS) types such as SearchResultCollection (in the...

Semantically I find this a little weird, since the extension method is called cast.. Shouldn't it be casting? It's casting each element if it needs to, within CastIterator... although using a generic cast, which won't use explicit... more 2/6/2014 3:47:56 PM

StreamWriter not closing correctly?

I'm having some trouble using the StreamWriter class correctly. I have about 10 objects I need to post, but only a couple at a time at most. However, after 2 posts, the third does...

I suspect it's more likely that it's to do with what you do with the response. The using statement will close the StreamWriter, and you don't even need the explicit Close call. However, you also need a using statement for the... more 2/6/2014 2:22:46 PM

Hashtable, Hashfunction: Difference between Value, Key, Hashvalue?

Lets imagine we have data we want to put in an Hashtable. The Hashfunction calculates an Hashvalue for each data object and put this hashvalues into a table (each value should get...

You always need to original key, to cope with hash collisions. The point of the hash code (or hash value as you're calling it) is to be able to very quickly find possible matches for the keys. The hash code is solely based on the key - the... more 2/6/2014 1:56:39 PM

Why don't the unmodifiable methods from Collections class, create collections with new elements?

Suppose there is this code: List<String> modifiableList = new ArrayList<String>(Arrays.asList("1","2","3")); List<String> unmodifiableList =...

Well the purpose of the methods is to create an unmodifiable view on an existing collection. That's the documented behaviour, and in many cases it's exactly what you want - it's much more efficient than copying all the data, for example...... more 2/6/2014 1:30:00 PM

Check XML node have attribute name with specific value Parse XML using Linq

First I apologize for creating a new question about XML parsing using Linq <?xml version="1.0" encoding="UTF-8"?> <html xmlns="http://www.w3.org/1999/xhtml"...

This is a namespace problem. You're looking for nav elements without specifying a namespace, but the default namespace is "http://www.w3.org/1999/xhtml". Additionally, you're looking for your epub attributes in the wrong way. I suggest... more 2/6/2014 12:33:25 PM

C# override Dictionary ContainsKey

I just can't find any proper piece of code to do what i need. Im using Dict.ContainsKey but due to the fact im always creating the Key i need to look for, i always get false for...

You don't need to override ContainsKey - you need to either override Equals and GetHashCode in someObj (which should be renamed to conform to .NET naming conventions, btw) or you need to pass an IEqualityComparer<someObj> to the... more 2/6/2014 12:23:42 PM

Change in string some part, but without one part where are numbers

For example I have such string: ex250-r-ninja-08-10r_ how could I change it to such string? ex250 r ninja 08-10r_ as you can see I change all - to space, but didn't change...

You can use regular expressions to only perform substitutions in certain cases. In this case, you want to perform a substitution if either side of the dash is a non-digit. That's not quite as simple as it might be, but you can use: string... more 2/6/2014 8:39:48 AM

Set timer on Buttons

I have created some button dynamically now I want to show all these buttons one by one . how could i use delay function . I use thread.sleep in loop . but it make delay for all...

You're currently blocking the UI thread - don't do that. Instead, I suggest you use a timer. For example: class Foo : Form { private int nextButtonToShow = 0; private Timer timer; private Button[] buttons; internal... more 2/6/2014 7:30:54 AM

How to change date Culture of a dateTime in DataTable or from GridView?

I have a some fields in database and two of them are as DateTime Field, which I am retrieving it via 'DataTable' in the GridView as in below code C# Code var connection = new...

A DateTime value doesn't have a culture, inherently. It's just a value. I suspect that you should change this though: DataFormatString="{0:g}" For example, change it to: DataFormatString="{0:yyyy/MM/dd HH:mm:ss}" (Note the HH rather... more 2/6/2014 7:19:17 AM