I need to sort a list, by X and Y. I read some on other questions to sort X and Y, but I didn't understand the:
List<SomeClass>() a; List<SomeClass> b = a.OrderBy(x => x.x).ThenBy(x => x.y).ToList(); I mean, x => x.x gives undeclared variable error.
Question is: How to sort by X and Y in a list, or: What variable to have instead of x => x.x????
edit: right, my list is like this:
List<Class1> MapTiles; and in class: int ID, int X, int Y
Thanx.
C# is case sensitive. You need
// Note the capital letters List<SomeClass> b = a.OrderBy(item => item.X).ThenBy(item => item.Y).ToList(); 
a.OrderBy(item => item.X).ThenBy(item => item.Y).ToList(). Write readable code, not short code.
< after OrderBy when you need a (.dlev's answer is the correct one to this question, the following is just an extended explanation of a concept that Marcus may have not understood fully
Just to clarify some point that was brought up in the comments, what's happening is you're actually passing in a delegate to do the sorting.
The following snippet
List<Item> b = a.OrderBy(item => item.X); Is like creating a static compare function that sorts by comparing the field (or property) X of an object of type Item and passing that compare function into a sort function, as you might do in C++.
The OrderBy(...) is just a very short and convenient way of accomplishing this.
List<SomeClass>() a;will not compile. WriteList<SomeClass> a = new List<SomeClass>();. Or, identical (but less noisy) code:var a = new List<SomeClass>();