Value cannot be null or empty. Parameter name linkText
Question
I have a project that similar on site in "asp.net MVC for professional" book, so i have a problem with navigation bar, problem in view.
the text of error is: Value cannot be null or empty. Имя параметра: linkText
@foreach (var link in Model)
{
@Html.RouteLink(link, new
{
controller = "Profile"
,
I understand that problem in link, but I have no idea how to fix it.
below code of controllers and view. Menu.cshtml
@model IEnumerable<string>
@Html.ActionLink("List", "Profile")
@foreach (var link in Model)
{
@Html.RouteLink(link, new
{
controller = "Profile",
action = "List",
category = link,
page = 1
})
}
NavController
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using HoboAnimal.Domain.Abstract;
namespace HoboAnimal.WebUI.Controllers
{
public class NavController : Controller
{
private IProfileRepository repository;
public NavController(IProfileRepository repo)
{
repository= repo;
}
public PartialViewResult Menu(){
IEnumerable<string> categories = repository.Profiles.
Select(x => x.Category).
Distinct().
OrderBy(x => x);
return PartialView(categories);
}
}
}
Layout
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>@ViewBag.Title</title>
<link href="~/Content/Site.css" type="text/css" rel="stylesheet" />
</head>
<body>
<div id="header">
</div>
<div id="categories">
@{Html.Action("Menu","Nav");}
</div>
<div id="content">
@RenderBody()
</div>
</body>
</html>
Thank you
2 answers
solution1
3 ACCPTED 2016-08-25 09:24:11
Since linkText is first argument of ActionLink and RouteLink, this mean that 1 or more of yours "link" in Model is empty string. Check it before create link:
@foreach (var link in Model)
{
if(!String.IsNullOrEmpty(link.toString())
{
@Html.RouteLink(link, new
{
controller = "Profile",
action = "List",
category = link,
page = 1
})
}
}
or remove empty rows from selection:
IEnumerable<string> categories = repository.Profiles.
Select(x => x.Category).
Distinct().
Where(x => !String.IsNullOrEmpty(x)).
OrderBy(x => x);
solution2
0 2020-08-23 16:25:05
This error:
Value cannot be null or empty. Имя параметра: linkText
only says that the linkText parameter is needed (he can't be null or empty ) in the ActionLink method.
for example you could write like this:
@Html.ActionLink(" ","List", "Profile")
it should help.
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