c# - Does a List do auto sorting? -

i wondering list auto sort or something?

i have

list<myclass> myclass = new list<myclass>() myclass.add(anotherclass); myclass.add(anotherclass2); myclass.add(anotherclass3); myclass.add(anotherclass4); 

so of them myclass object. have in it

public class myclass {    public string type {get; set;}    public string title {get; set;} }   list<myclass> first = myclass .where(x => x.type == "first").tolist(); list<myclass> second = myclass .where(x => x.type == "second").tolist();  first.sort((x, y) => string.compare(x.title, y.title)); second.sort((x, y) => string.compare(x.title, y.title)); myclass.clear(); myclass.addrange(first); myclass.addrange(second); 

so real code sort of looks except "myclass" more complex , have them in foreach loop.

when first.sort() , second.sort() objects in correct order based on title. when clear , add "first" objects in first , "second" object second ruins sorting.

i need objects type "first" sorted , before objects types "second".

so have

a - first b - second c - first d - second 

it be

a c b d 

i getting

a - first b - second c - first d - second 

no, list<t> stores elements in order add them, unless explicitly insert @ particular positions.

you can ask sort, however, , provide custom comparison sort on - have done.

it looks you're doing right thing describe want. if took men in train carriage i'm sitting in, ordered them age, , created 1 list that, did same women, , used:

list<person> allpeople = new list<person>(); allpeople.addrange(mensortedbyage); allpeople.addrange(womensortedbyage); 

i wouldn't everyone sorted age - i'd men (sorted age) women (sorted age). that's should seeing.

if that's not you're seeing it's want, need give short complete program demonstrates problem. tell expected, , got.

if want order multiple criteria, it's easiest use linq:

var ordered = people.orderby(p => p.gender)                     .thenby(p => p.age)                     .tolist(); 

edit: demonstration of code (fixed typos, , using anonymous type simplicity) working:

using system; using system.collections.generic; using system.linq;  class test {     static void main()     {         var myclass = new[]         {             new { type="first", title="a" },             new { type="second", title="d" },             new { type="first", title="c" },             new { type="second", title="b" },         }.tolist();         var first = myclass.where(x => x.type == "first")                            .tolist();         var second = myclass.where(x => x.type == "second")                             .tolist();          first.sort((x, y) => string.compare(x.title, y.title));         second.sort((x, y) => string.compare(x.title, y.title));         myclass.clear();         myclass.addrange(first);         myclass.addrange(second);         foreach (var x in myclass)         {             console.writeline(x);         }     } } 

output:

{ type = first, title = } { type = first, title = c } { type = second, title = b } { type = second, title = d }