Browse questions answered by Jon Skeet

c# XDocument issue

I am quite new to xml-parsing. Following very basic tutorials I try to parse the following xml returned by a CalDav server: <?xml version="1.0" encoding="utf-8"...

Your response element is actually in a namespace, due to this attribute in the root node: xmlns="DAV:" That sets the default namespace for that element and its descendants. So you need to search for elements in that namespace too.... more 6/12/2015 12:13:21 PM

C# Unusual xml parsing

I have to parse one xml file to another, strictly defined one. The original file looks something like this: <Data> <Client> <id>ID1</id> ...

I would strongly recommend using LINQ to XML instead of XPath for this. (You can use XPath, certainly - but it's less readable IMO. You'd just need to use ClientNodes[i].SelectNodes("Details").) var xml = XDocument.Load(...); foreach (var... more 6/12/2015 10:22:50 AM

out parameter assigned by passing it to another function as an out parameter

I wrote a Tree structure and then made a static function to try to parse a Tree from a source file. public static bool TryParseTreeFromFile(String filePath, out Tree tree) { ...

The problem is that you're only conditionally calling CreateTree. Suppose parsingIsTotal is false - then this expression: parsingIsTotal && CreateTree(...) will evaluate the left hand operand, find that it's false, and not... more 6/12/2015 7:15:55 AM

How to return value from the method in C#

It might be a small question, but i am not understanding why it is throwing error. Error: Use of unassigned local variable status. public static bool...

There are two problems here: 1) You've declared a local variable a static. That's invalid. 2) If an exception is thrown early in your method, you're catching it and then trying to return status without ever assigning a value to it. I... more 6/12/2015 7:12:01 AM

Coverting String to LocalTime with/without nanoOfSeconds

I need to convert a string to LocalTime (java-8 not joda) that may or maynot have nanoOfSeconds in the string. The String format is in the form of 07:06:05 or 07:06:05.123456...

You could use "optional sections" of the format pattern for this: DateTimeFormatter dtf = DateTimeFormatter.ofPattern("H:mm:ss[.SSSSSS]"); more 6/11/2015 6:15:18 PM

Set LocalTime joda

How to set required timezone in LocalTime from joda? Required timezone - Moscow. Default constructor new LocalTime() shows other time for me: it shows time, which is one hour...

A LocalTime doesn't have a time zone. That's the whole point of it. If you want the LocalTime for a particular instant in a particular time zone, you can use DateTime and then toLocalTime: DateTime now = new DateTime(zone); // Urgh: see... more 6/11/2015 4:38:45 PM

Get those elements from a List of custom class objects whose one property value is parseable to double

I have a list of custom class objects in C# with class structure like this: public class ABC { int ID; string Text1; string Text2; } This list stores data like...

You can use double.TryParse within LINQ, although admittedly the out parameter is annoying: ABCObject = ABCObject .Where(x => { double ignored; return double.TryParse(x => x.Text2, out ignored); } .GroupBy(c => c.ID) ... more 6/11/2015 4:35:06 PM

Attempting to use SHA1 hashing to send password to Google

I am currently working on a program with Google's Directory API to reset the password of someone in my domain. I have it all working, but I would like to send an encrypted...

(Disclaimer: I work for Google, but I haven't looked at this API before.) Well, the problem when you call password.ToString() is that it's not providing the hex representation - so that's why the first piece of code fails. It looks like... more 6/11/2015 4:07:31 PM

why use protocol buffers in java

Recently,I read code of HBase.I find client use protobuf to communicate with server in HBase's code. Java has "Serializable". why not use it?

Efficiency: protocol buffers are generally much more efficient at transmitting the same amount of data than Java binary serialization Portability: Java binary serialization is not widely implemented outside Java, as far as I'm aware... more 6/11/2015 2:58:36 PM

Why final Byte as a case in switch statement doesn't compile?

byte a = 125; final byte b = 2; final Byte c = 3; switch (a) { case b: // works fine break; case c: // Constant Expression required break; } Since cis a final variable,...

Since c is a final variable, isn't it a compile time constant No. The rules for constant expressions are given in JLS 15.28, and they don't include wrapper types: A constant expression is an expression denoting a value of... more 6/11/2015 1:41:51 PM