Browse questions answered by Jon Skeet

How to prevent code duplication inside using statement System.Text.Encoding

Ok how can i prevent code duplication in this particular case The duplication happens due to streamreader character encoding. In some cases i want to use default and in some...

Just use Encoding.UTF8 if you don't have a different one: var encoding = irCustomEncoding == 0 ? Encoding.UTF8 : Encoding.GetEncoding(irCustomEncoding); using (TextReader reader = new... more 9/4/2014 4:27:12 PM

Java String encoding

What´s the difference between "hello world".getBytes("UTF-8"); and Charset.forName("UTF-8").encode("hello world").array(); ? The second code produces a byte array with...

Your second snippet uses ByteBuffer.array(), which just returns the array backing the ByteBuffer. That may well be longer than the content written to the ByteBuffer. Basically, I would use the first approach if you want a byte[] from a... more 9/4/2014 4:19:29 PM

Constraint on class type parameters to say types must not be equal?

I wondered if there's any type constraint in C# .NET that states that one type parameter doesn't equal another type parameter; something like this... public class...

No, there's no such constraint in C# - and I wouldn't expect there to be one in the future, given that it's of fairly limited use. (This isn't a situation that comes up terribly often in my experience.) more 9/3/2014 9:54:39 PM

Type is not supported for deserialization of an array

I'm trying to dezerialize an array but I keep running into an error. JavaScriptSerializer jsonSerializer = new JavaScriptSerializer(); Profiles thingy =...

You just need to deserialize it to a collection of some sort - e.g. an array. After all, your JSON does represent an array, not a single item. Short but complete example: using System; using System.IO; using... more 9/3/2014 9:50:45 PM

Should I create a new thread as a class that extends Thread or just do a new Thread object instantiation?

I just found out I could create a new thread with a simple Thread myThread = new Thread() { public void run() {} } But most books suggest I make a class that extends...

I would suggest not extending Thread itself at all. Instead, use the Thread overload which accepts a Runnable: Thread thread = new Thread(new Runnable() { @Override public void run() { ... } }); You're not really... more 9/3/2014 9:29:36 PM

What's going on with this method overloading?

I have a question about method overloading in C#. I have a parent class and a child class. class Parent { public virtual string GetMyClassName() { return "I'm...

Why does str1 get set to "That's a Parent"? Because overloading is (usually) determined at compile-time, not execution time. It's based purely on the compile-time types of the target and arguments, with the exception of calls using... more 9/3/2014 8:53:34 PM

Class with nested struct as a property doesn't work

Why doesn't the following code work? If I change h from a property to a field, it works! Or if I change FileHeader from struct to a class it works! I am only looking for an answer...

This line: o.h.setColNames(); is equivalent to: FileHeader tmp = o.h; tmp.setColNames(); Because FileHeader is a struct, the value of tmp is a copy of the value of the field within o. Modifying tmp doesn't change o.h. I would... more 9/3/2014 6:55:45 PM

Why 10.0.64.0/24 overlaps with 10.0.66.0/18?

Why 10.0.64.0/24 overlaps with 10.0.66.0/18? I thought that 10.0.64.0/24 will go up to 10.0.64.255.

They overlap in that 10.0.64.1 is in both 10.0.64.0/24 and 10.0.66.0/18, for example. It's not the /24 range which is causing you a problem - it's the /18 range, which will include everything from 10.0.64.0 to 10.0.127.255. The "66" in... more 9/3/2014 4:28:44 PM

GetHashCode() dummy implementation if not needed

I have already read tons of articles on properly implementing Equals() and GetHashCode(). I have some classes with lots of member variables for which I had to implement an...

If you really don't want to implement it, I would recommend throwing an exception instead (e.g. NotImplementedException) - then you're not just relying on Debug.Fail working. If you end up in this situation in a production environment,... more 9/3/2014 2:39:04 PM

Threads in Java vs Async Tasks in C# Xamarin

I am trying programming in android using Xamarin.android using C#. While watching a tutorial of android I have found out that they are using Thread for asynchronous programming...

It depends on what sort of asynchronous programming you're talking about. If it's background processing, then you'll still want a task on a different thread. You can still use async/await for that, of course. If it's really just... more 9/3/2014 12:46:50 PM