c# - What's the better way to write this linq query? -


sql: 

select node.categoryid,      node.categoryname,      node.description,      node.lft, node.rgt,      node.showonmenu,  (count(parent.categoryname) - 1) level,   (case when node.lft = node.rgt - 1 'true' else 'false' end) leaf article_category node, article_category parent node.lft between parent.lft , parent.rgt group node.categoryid,node.categoryname,node.description,node.lft,node.rgt,node.showonmenu order node.lft

my linq expression:

        var list = (from node in dbcontext.categories                     parent in dbcontext.categories                     node.lft >= parent.lft && node.lft <= parent.rgt                     select new                     {                         node.categoryid,                         node.categoryname,                         node.description,                         node.lft,                         node.rgt,                         node.showonmenu,                         parentname = parent.categoryname,                     } x                     group x new                     {                         x.categoryid,                         x.categoryname,                         x.description,                         x.lft,                         x.rgt,                         x.showonmenu,                     } g                     orderby g.key.lft                     select new                     {                         categoryid = g.key.categoryid,                         categoryname = g.key.categoryname,                         description = g.key.description,                         lft = g.key.lft,                         rgt = g.key.rgt,                         showonmenu = g.key.showonmenu,                         level = g.count() - 1,                         isleaf = g.key.lft == g.key.rgt - 1                     }).tolist();

my question:

  1. the linq expression long, there 2 'select new' expressions, wonder how make shorter?

  2. what's corresponding extension method linq query? how can express "from... from...where..." extension method?

the first select new .. x don't see why need, try removing , write group node new...

"from...from" written lambda expression this:

categories.selectmany(n => categories, (n, p) => new { node = n, parent = p });

Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db : ...
Read more

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite...
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle); ...
Read more