c# - Fetching data from database and populating a dropdownlist from a List<object> in MVC -
i have model:
public partial class userrole { public int id { get; set; } public int userid { get; set; } public int roleid { get; set; } public int status { get; set; } public virtual user users { get; set; } public virtual role roles { get; set; } } public partial class user { public user() { roles = new list<selectlistitem>(); } public long id { get; set; } public string email { get; set; } public string password { get; set; } public system.datetime reg_date { get; set; } public byte validated { get; set; } public virtual icollection<userrole> userroles { get; set; } public int roleid { get; set; } public string rolename { get; set; } public ienumerable<selectlistitem> roles { get; set; } //public ienumerable<role> roles { get; set; } } public partial class role { public int id { get; set; } public string rolename { get; set; } public string desc { get; set; } public int status { get; set; } public virtual icollection<userrole> userroles { get; set; } } controller load view:
public actionresult assignrole(long id = 0) { user usermodel = new user(); int userid = convert.toint32(id); ilist<user> users = new list<user>(); var query = role in db.roles join userrole in db.userroles on role.id equals userrole.roleid join user in db.users on userrole.userid equals user.id userrole.userid == userid select new { rolename = role.rolename, email = user.email, userid = user.id }; var userss = query.tolist(); foreach(var userlist in userss) { users.add(new user() { id = userlist.userid, email = userlist.email, rolename = userlist.rolename }); } loadroles(users); return view(users); } public void loadroles(ilist<user> model) { var roles = db.roles.asqueryable<role>().select(x => new selectlistitem() { text = x.rolename, value = sqlfunctions.stringconvert((double) x.id) }).tolist(); var usermodel = new user() { roles = roles.tolist() }; } i able other values linq in first part of view unable populate dropdownlist.
<fieldset> <div> <table> <tr> <th> @html.displaynamefor(model => model.email) </th> <th> @html.displaynamefor(model => model.rolename) </th> <th></th> </tr> @foreach (var item in model) { <tr> <td> @html.displayfor(modelitem => item.email) </td> <td> @html.displayfor(modelitem => item.rolename) </td> <td> @html.actionlink("delete", "delete", new { id = item.id }) </td> </tr> } </table> </div> <div class="display-label"> @html.displayname("add role") </div> @foreach (var item in model) { <div class="display-field"> @html.dropdownlistfor(modeiteml => item.roleid, item.roles) </div> } <p> <input type="submit" value="assign" /> </p> how can populate dropdownlist? have tried still no luck.
you'll find clearer if write this:
public actionresult assignrole(int id = 0) { var user = (from u in db.users join r in db.userroles on r.userid equals u.id g u.id == id select new user { id = u.id, email = u.email, // assign properties normal select. roles = g.select(x => new role { rolename = x.rolename ... }) }) .firstordefault(); return view(user); // update view expect single user } this way you've gotten need in 1 quick trip database, , model represents have (a single user multiple roles).
if want separate list of roles can assign, recommend putting in separate view model scenario. i.e.
public class assignrolesmodel { public user user { get; set; } public ienumerable<role> availableroles { get; set; } } then change return view(user) to:
var viewmodel = new assignrolesmodel { user = user, roles = db.roles .select(x => new selectlistitem() { text = x.rolename, value = sqlfunctions.stringconvert((double) x.id) }) .tolist() }; return view(viewmodel);
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