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var array = new [] {d, "hello"} is implicitly typed to dynamic[] and not string[] ? why?

dynamic d = 5; var array = new[] {d,"hello"} What is the implicit type of array ? It is dynamic[] but not string[], why ? While going through C# in depth - Jon Skeet stated a...
Jon Skeet
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For the most part, you can ignore this detail. But if you look through the specification, you'll see various place that the language considers conversions from type X to type Y. There are other places that the language considers... more

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Is it possible to create a deadlock in C# if nothing but the lock keyword is used around primitive data access?

I've written a lot of multi-threaded C# code, and I've never had a deadlock in any code I've released. I use the following rules of thumb: I tend to use nothing but the lock...
Jon Skeet
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Yes, it's easy to deadlock, without actually accessing any data: private readonly object lock1 = new object(); private readonly object lock2 = new object(); public void Method1() { lock(lock1) { Thread.Sleep(1000); ... more

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Declaring a 2D array without knowing its size in C#

I would like to use a 2-D array but I can't know its size in advance. So my question is: how to declare it? And then how to add values into it? String[,] tabConfig = new...
Jon Skeet
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So my question is: how to declare it? You can't. All arrays in .NET are fixed size: you can't create an array instance without knowing the size. It looks to me like you should have a List<T> - and I'd actually create a class... more

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Reference to an object of any class that implements two or more given interfaces

Given any interface I, it is possible to declare a variable that holds a reference to any object of a class C that implements I: I i = new C(); I want to do something similar....
Jon Skeet
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Given two interfaces, I want to declare a variable that holds a reference to any object of a class that implements both interfaces Unfortunately you can't do that. You can do so for a parameter in a generic method, like this: public... more

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ArrayList One loop sorted, the other unsorted

For this assignment I need to sort one list and also keep the original list, but when I click the button twice, the original list is also sorted. String output = ""; ...
Jon Skeet
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I suspect you just want to take a copy of the list, then sort that: List<Song> sortedSongs = new ArrayList<Song>(song); Collections.sort(sortedSongs); // Will not affect song Note that this should be done before your loop,... more

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.Net 4.0 Optimized code for refactoring existing "if" conditions and "is" operator

I have following C# code. It works fine; but the GetDestination() method is cluttered with multiple if conditions by using is operator. In .Net 4.0 (or greater) what is the best...
Jon Skeet
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Here's one option: private static readonly Dictionary<Type, string> DestinationsByType = new Dictionary<Type, string> { { typeof(Manager), @"\ManagerHome" }, { typeof(Accountant), @"\AccountantHome" }, //... more

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C# is not able to convert my Character to String in a Foreach loop

I am using a simple code to read the JSON data. I previously needed some help in that, but I am able to overcome the exception through a Google search about the error. But this...
Jon Skeet
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You're using foreach on a string. Effectively: string x = "foo"; foreach (string y in x) That makes no sense - a string is a sequence of characters, not a sequence of strings. In order to get the code to compile, you could just remove... more

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C# Singleton Thread safe variables

I have referred to Jon Skeet's article here (http://csharpindepth.com/articles/general/singleton.aspx), the sixth version. However, I have some private variables that I want...
Jon Skeet
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This is the problem: string _plantCode = appSettings["PlantCode"] ?? "Not Found"; That isn't assigning to the instance variable - it's declaring a new local variable. You just want: _plantCode = appSettings["PlantCode"] ?? "Not... more

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NUnit Gets Different Hash Code Values from ReSharper vs Visual Studio 2013

I have a fairly simple GetHashCode() implementation in C# as per Jon Skeet's answer here. Here is my code: public override int GetHashCode() { unchecked { int...
Jon Skeet
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You're probably using the 32-bit CLR in one test runner and the 64-bit CLR in another. The implementation of string.GetHashCode differs between the two. You should not depend on them being consistent between runs - they only have to be... more

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XML XDocument There appears to be no elements

I'm trying to understand XDocument and it's various methods. I have a site map, and I'm trying to read the URLs <urlset...
Jon Skeet
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How do I iterate over the loc values? The simplest way is to use the overload of Descendants which accepts an XName: foreach (var loc in siteMap.Descendants("loc")) { string value = loc.Value; ... } Currently, you're asking... more

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