When specifying asp-controller and asp-action on a link, what's the syntax for also passing an id attribute?
E.g. If I wanted to link to the edit URL for a given object, the required URL would be /user/edit/5 for example.
Is there a method to achieve this using TagHelpers, or do we still have to fall back to @Html.ActionLink()?
You can use the attribute prefix asp-route- to prefix your route variable names.
Example: <a asp-action="Edit" asp-route-id="10" asp-route-foo="bar">Edit</a>
I'd like to suggest a combination of the other two answers, but with a bit of extra clarification.
You will use an attribute prefix asp-route-{name} where {name} is the name of the route parameter you want to use. In other words, if the number 5 in your route is passed into the controller as an ID value, you could have:
<a asp-controller="User" asp-action="Edit" asp-route-id="@item.ID">Edit</a>
or if the parameter you wanted to pass to the route was item.UserName then
<a asp-controller="User" asp-action="Edit" asp-route-username="@item.UserName">Edit</a>
And if you had both parameters then
<a asp-controller="User" asp-action="Edit" asp-route-id="@item.Id" asp-route-username="@item.UserName">Edit</a>
you can pass custom ID using below code:
<a asp-controller="User" asp-action="Edit" asp-route-id="@item.ID">Edit</a>
来源：https://stackoverflow.com/questions/30020892/taghelper-for-passing-route-values-as-part-of-a-link