Beyond the obvious use of var with LINQ, I also use it to abbreviate hairy variable declarations for readability, e.g.: var d = new Dictionary<string, Dictionary<string, Queue<SomeClass>>>(); In general, I get a kind of comfort (for want of a better word) from static typing that makes me reluctant to give it up. I like the … Read more
Anonymous types are just regular types that are implicitly declared. They have little to do with dynamic. Now, if you were to use an ExpandoObject and reference it through a dynamic variable, you could add or remove fields on the fly. edit Sure you can: just cast it to IDictionary<string, object>. Then you can use … Read more
It cannot be done by Func but you can define a custom delegate for it: public delegate object MethodNameDelegate(ref float y); Usage example: public object MethodWithRefFloat(ref float y) { return null; } public void MethodCallThroughDelegate() { MethodNameDelegate myDelegate = MethodWithRefFloat; float y = 0; myDelegate(ref y); }
It’s dictated in the language specification, section 10.6.9 of the C# 4 spec: When the first parameter of a method includes the this modifier, that method is said to be an extension method. Extension methods can only be declared in non-generic, non-nested static classes. The first parameter of an extension method can have no modifiers … Read more
First of all… yes its a good way of doing it, it’s clean, small form and easy to read & understand… the caveat of course is “Unless you later want to unsubscribe”. I believe Jon Skeet pointed out before that “the specification explicitly doesn’t guarantee the behaviour either way when it comes to equivalence of … Read more
No, this seems perfectly reasonable. There is a List<T>.AddRange() method that basically does just this, but requires your collection to be a concrete List<T>.
Try this, simple and compact: public static string ToRoman(int number) { if ((number < 0) || (number > 3999)) throw new ArgumentOutOfRangeException(“insert value betwheen 1 and 3999”); if (number < 1) return string.Empty; if (number >= 1000) return “M” + ToRoman(number – 1000); if (number >= 900) return “CM” + ToRoman(number – 900); if (number … Read more
I’ve just recently discovered the functional programming style […] Well, recently I was given a chance to give a talk on how to reduce software development efforts, and I wanted to introduce the concept of functional programming. If you’ve only just discovered functional programming, I do not recommend trying to speak authoritatively on the subject. … Read more
I’ve fixed it myself now. It was a schoolboy error passing too many parameters to the CreateQuery(… ) call. Paste the following code into the Dynamic.cs file within the DynamicQueryable class for a dynamic Join extension method. You can find the source for the DynamicQuery sample project at http://code.msdn.microsoft.com/csharpsamples. Enjoy. public static IQueryable Join(this IQueryable … Read more
As mentioned, MIME magic is the only way to do this. Many platforms provide up-to-date and robust MIME magic files and code to do this efficiently. The only way to do this in .NET without any 3rd party code is to use FindMimeFromData from urlmon.dll. Here’s how: public static int MimeSampleSize = 256; public static … Read more