file - Sorting the result of Directory.GetFiles in vb.net -

i have 1 directory contain tif formate file ,near 30 file name b_1 ,b_2...upto b_15 , f_1 ,f_2...upto f_1. when getting file getfile method.

    dim di new io.directoryinfo("c:\abc\")     dim diar1 io.fileinfo() = di.getfiles() 

but while retriving using each loop getting result b_1,b_10,b_11,b_12,b_13,b_14,b_15,b_2,b_3...upto b_9 same f_1,f_10,f_11,f_12,f_13,f_14,f_15,f_2,f_3...upto f_9

but problem want in pattern b_1,b_2,b_3,b_4.....b_9,b_10,b_11......b_15 , f_1,f_2,f_3,f_4.....f_9,f_10,f_11......f_15

actually task getting file directory , join tiff file file f_1,b_1,f_2,b_2...f_9,b_9,f_10,b_10,f_11,b_11,....f_15,b_15

i have achieved everthing means join tiff , file start b , f storing in respective arraylist due comming file in b_,b_10..so on thats why getting problem...

plz me...

the simplest solution create method returns sort key string, instance, in situation, should suffice:

public function getfileinfosortkey(fi fileinfo) string     dim parts() string = fi.name.split("_"c)     dim sortkey string = nothing     if parts.length = 2         sortkey = parts(1).padleft(10) & parts(0)     else         sortkey = fi.name     end if     return sortkey end function 

then, can use method sort array of fileinfo objects, this:

array.sort(diar1, function(x, y) getfileinfosortkey(x).compareto(getfileinfosortkey(y))) 

if don't care keeping array, may want use orderby extension method provided linq:

dim diar1 ienumerable(of fileinfo) = di.getfiles().orderby(of string)(addressof getfileinfosortkey) 

alternatively, if using older version of visual studio not support lambda expressions, can creating separate comparer method, this:

public function fileinfocomparer(x fileinfo, y fileinfo) integer     return getfileinfosortkey(x).compareto(getfileinfosortkey(y)) end function 

then call array.sort using comparer method, this:

array.sort(diar1, addressof fileinfocomparer)