Properties can have code put into them without breaking contract, fields can’t have code put into them without changing them to properties (and breaking the interface). Properties can be read only or write only, fields can’t. Properties can be data bound, fields can’t.
Because ForEach(Action) existed before IEnumerable<T> existed. Since it was not added with the other extension methods, one can assume that the C# designers felt it was a bad design and prefer the foreach construct. Edit: If you want you can create your own extension method, it won’t override the one for a List<T> but it … Read more
You can use the fact that every array implements IEnumerable: string[] arr = ((IEnumerable)obj).Cast<object>() .Select(x => x.ToString()) .ToArray(); This will box primitives appropriately, before converting them to strings. The reason the cast fails is that although arrays of reference types are covariant, arrays of value types are not: object[] x = new string[10]; // Fine … Read more
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
I think you are mixing concepts. public List<string> myList {get; private set;} is already “read-only”. That is, outside this class, nothing can set myList to a different instance of List<string> However, if you want a readonly list as in “I don’t want people to be able to modify the list contents“, then you need to … Read more
Interesting article on that here. From there … … [B]y ensuring that the members do not change, we ensure that the hash is constant for the lifetime of the object.This allows anonymous types to be used with collections like hashtables, without actually losing them when the members are modified. There are a lot of benefits … Read more
Chapter 11 (Inside Expression Trees) and chapter 12 (Extending Linq) of Programming Microsoft Linq (ISBN 13: 978-0-7356-2400-9 or ISBN 10: 0-7356-2400-3) has been invaluable for me. I haven’t read Jons book, but he is a quality guy and explains things well, so I assume that his coverage would also be good. Another great resource is … Read more
Anonymous types in C# are immutable and hence do not have property setter methods. You’ll need to create a new anonmyous type with the values obj = new { Name = “asdasd”, Price = 11.00 };
A quick-and-easy way to get this is: Names.ToList().ForEach(e => …);
From C# 6 onward: this is no longer a problem Becore C# 6, you need to call the default constructor for this to work: public MyStruct(int size) : this() { Size = size; } A bigger problem here is that you have a mutable struct. This is never a good idea. I would make it: … Read more