How do I get route values from inside a View Component controller in .NET Core?

Question

I have a View Component in _Layout.cshtml. My application has a route of /home/{id}. How can I get the id value in my URL route from the View Component controller?

public class LayoutViewComponent : ViewComponent
{
    public async Task<IViewComponentResult> InvokeAsync()
    {
        //how do I get the value of {id} here?

        return View();
    }
}

Win · Accepted Answer · 2017-04-07 19:55:20Z

2

You do not want view to go and get the required parameter from query string by itself. It could strict the usage of the view.

Instead, you could pass Id from parent.

// Parent's Action Method
public IActionResult ParentActionMethod(int id)
{
    // You could use strongly typed model
    ViewBag.Id = 1;
    return View(); 
}    

// Parent's View
@await Component.InvokeAsync("Layout", new { Id = ViewBag.Id })

// View Component
public class LayoutViewComponent : ViewComponent
{
    public async Task<IViewComponentResult> InvokeAsync(int id = 10)
    {
        return View();
    }
}

edited Apr 7, 2017 at 19:55

answered Apr 7, 2017 at 19:31

Win

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