c# - List loop operations with linq -

i've list this:

var query = enumerable.range(0, drea2.count / 4 * 1440).select((n, index) => {     if ((index >= 480 && index < 750) || (index >= 810 && index < 1080))         return 0;     else if (index >= 750 && index < 810)         return 1;     else         return 2; }); 

but, range must changeable. example; i've list contains these indexes. these indexes may different each other.

1440 means 1440 min. of day. want add 1440 these indexes. example:

query[0], ... query[479] = 2 --- query [1440], ... query[1919] = 2 --- query[2880] = 2

query[480], .. query[749] = 0, --- query[810], .. query[1079] = 0, --- query[1920], .. query[2189] = 0..

so, whatever count of drea2 list, query has size (drea2.count / 4 * 1440)

how can this?

edit: if drea2.count() returns 6, if condition must have 6 different phrase per 1440 index. first if: (and query range must has 7200 size, now)

if ((index >= 480 && index < 750) || (index >= 810 && index < 1080))     return 0; // 1  if ((index >= 480 + 1440 && index < 750 + 1440) || (index >= 810 + 1440 && index < 1080 + 1440))         return 0; // 2 ...               // 3 (+ 2880) ...               // 4 (+ 4320) ...               // 5 (+ 5760)  if ((index >= 480 + 7200 && index < 750 + 7200) || (index >= 810 + 7200 && index < 1080 + 7200)) 

as per updates op, have rewritten answer. reference of previous version, follow this link.

here proposed solution, assuming drea2 collection array, or list (thus implementing ilist<int> interface) , each 4 items in list form ranges used in produced sequences of 1440 items:

public ienumerable<int> getquery(ilist<int> drea2) {     var count = drea2.count;     var result = new int[(count/4)*1440];      (var = 0, fillindexstart = 0; < count; i+= 4, fillindexstart += 1440) {         var rangeindices = new[] {              drea2[i],              drea2[i+1],              drea2[i+2],              drea2[i+3]          };          (var j = 0; j < rangeindices[0]; j++) {             result[fillindexstart + j] = 2;                          }         (var j = rangeindices[3]; j < 1440; j++) {             result[fillindexstart + j] = 1;                          }     }      return result; } 

unfortunately, there no linq here, hope needed.

the previous code have used condition, instead of 2 loops in method above:

if ((j >= rangeindices[0] && j < rangeindices[1])          || (j >= rangeindices[2] && j < rangeindices[3]))     result[fillindexstart + j] = 0; else if (j >= rangeindices[1] && j < rangeindices[2])     result[fillindexstart + j] = 1; else     result[fillindexstart + j] = 2; 

since array filled default values, can take advantage of result being full of zeros. why have rewritten conditions 2 for loops

note. code above relies on drea2.count / 4 0. otherwise, indexoutofrangeexception when initializing rangeindices array.