Browse questions answered by Jon Skeet

Add New Code Block Dynamically To Action Delegate in .Net

I have encountered a problem about injecting new code block to an action delegate. For instance, i have a method like this: private void methodAsync(Action action) { ...

It sounds like you just want: private void methodAsync(Action action) { new Task(() => { writeMessage("Task started"); action(); writeMessage("Task completed"); }).Start(); } In other words, you're not... more 11/27/2013 7:50:50 AM

c# TrimEnd removes more than needed?

Here is debugger. I don't understand why TrimEnd delete 's' character. After TrimEnd() Any suggestions? recPath is private string in class. code: recPath = ""; ...

The problem is that you're passing in lastkey.ToCharArray() as the list of characters to trim. That includes the character s, so the s of Fonts is being trimmed as well. (Ditto the backslash.) From the docs for TrimEnd: The TrimEnd... more 11/27/2013 7:44:09 AM

Can you convert this Linq statement into Lambda without using join statements?

I see this all over the web, however I'm curious if there isn't an easier way to write this in lambda? var x = from c in db.Client from p in db.Prospects from ct in...

Basically multiple from clauses contribute SelectMany calls. So your code is something like: var x = db.Client .SelectMany(c => db.Prospects, (c, p) => new { c, p }) .SelectMany(z => db.Countys, (z, ct) =>... more 11/26/2013 5:42:00 PM

Cannot find xml element using linq query in Portable Class Library

in an console project I create an XDocument and using linq to get xml elements. See following code. I try to use the same in a portable class library but it does not work. Is...

You're looking for an element called title - but it's actually an attribute. The same code would fail on desktop too. You want: title = (string)el.Attribute("title") It's not really clear why you need an anonymous type here - you could... more 11/26/2013 11:33:47 AM

Syntax error on token "<=", invalid AssignmentOperator

I'm attempting to fix a plugin I wrote a long time ago for Craftbukkit, but I'm stumped on one section. I've searched Google with little luck, and I've asked other Java developers...

Basically this is the wrong way round: for (; result.next(); i <= rsmd.getColumnCount()) It should possibly be: for (; i <= rsmd.getColumnCount(); result.next()) Although more likely, you actually want: while (result.next())... more 11/25/2013 9:59:05 PM

Casting Stack to Iterable

In the following code, the method returns a Stack object which gets casted to an Iterable. public Iterable<Integer> getRoute(int x) { Stack<Integer> stack = new...

There's no actual casting here - just an implicit conversion from Stack<Integer> to Iterable<Integer> because Stack<E> implements Iterable<E> (implicitly, by extending Vector<E>, which extends... more 11/25/2013 5:08:41 PM

Message: Invalid byte 1 of 1 byte UTF 8 sequence in hadoop

I'm parsing XML using Hadoop, and I got the code from here. But I'm getting the following error: FINISH_TIME="1385387129970" HOSTNAME="DEV140" ERROR="java.io.IOException:...

I suspect this is the problem - it's at least a problem: XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(new ByteArrayInputStream(document.getBytes())); That call to getBytes will use the... more 11/25/2013 2:03:57 PM

Get a List<String> from List<Object> in C#

Is there a way to extract the Color type as a list from this List? public List<object1> Color1 = new List<object1>() { new object1{Color=(Color)new...

LINQ is your friend: List<string> names = Color1.Select(x => x.Name).ToList(); Or using List<T>.ConvertAll: List<string> names = Color1.ConvertAll(x => x.Name); Personally I prefer using LINQ as it then works... more 11/25/2013 1:25:05 PM

The given path's format is not supported using File.ReadAllText

I have a WPF application. I am loading some data from XML file. I receive an error: System.NotSupportedException was unhandled Message: The given path's format is not...

File.ReadAllText is meant to take a filename on a file system - not a URL. You'll need to fetch it with something like WebClient.DownloadString: string text; using (WebClient client = new WebClient()) { text =... more 11/25/2013 11:46:36 AM

Is it possible to write to the middle of a file using Filestream in C#

Wanting to know if it is possible to insert text into the middle of a file using FileStream in .NET/C#. If not, is there another way of doing it? I see the option of Truncate and...

No - this is fundamentally a limitation of most file systems. I would recommend the approach you're suggesting (selective copying from the original file to a new file) but then just rename the files rather than copying back over the top... more 11/25/2013 11:39:44 AM