Using C#, how can I manually validate a html tag? -

i have example image tag:

<img src="http://... .jpg" al="myimage" hhh="aaa" /> 

and mantain, example, image tag list of valid attributes

l1=(alt, src, width, height, align, border, hspace, longdesc, vpace) 

i parsing img tag , getting used attributes this:

l2=(src, al, hhh) 

how can programaticaly validate image tag? 'al' attribute should become 'alt' ('alt' attribute more 'align' contains more characters) , 'hhh' tag disappear (because there no attribute it)?

for result tag should this:

<img src="http://... .jpg" alt="myimage" /> 

thanks.

jeff

you use linq2xml parse code:

xelement doc = xelement.parse(...) 

then correct wrong attributes using best-match algorithm against valid attributes in-memory dictionary.

edit: wrote , tested simplified best-matched algorithm (sorry, it's vb):

dim validtags() string =             {                 "width",                 "height",                 "img"             } 

(simplified, should create more structured dictionary tags , possible attributes each tag)

dim maxmatch integer = 0 dim matchedtag string = nothing each tag string in validtags     dim match integer = checkmatch(tag, source)     if match > maxmatch         maxmatch = match         matchedtag = tag     end if next  debug.writeline("matched tag {0} matched % {1}", matchedtag, maxmatch) 

the above code calls method determine percentage source string equals valid tag.

private function checkmatch(byval tag string, byval source string) integer          if tag = source return 100           dim maxpercentage integer = 0          index integer = 0 tag.length - 1              dim tindex integer = index             dim sindex integer = 0             dim matchcounter integer = 0              while true                 if tag(tindex) = source(sindex)                     matchcounter += 1                 end if                  tindex += 1                 sindex += 1                  if tindex + 1 > tag.length orelse sindex + 1 > source.length                     exit while                 end if             end while              dim percentage integer = cint(matchcounter * 100 / math.max(tag.length, source.length))             if percentage > maxpercentage maxpercentage = percentage         next          return maxpercentage      end function 

the above method, given source string , tag, finds best match percentage comparing single characters.

given "widt" input, finds "width" best match 80% match value.