NavigationManager – Get current URL in a Blazor component

Use the Uri property from the NavigationManager class.

How it works

Get it from injection before using it on .razor pages:

@inject NavigationManager MyNavigationManager

Or like this in a .cs file if you prefer the “code-behind” experience:

using Microsoft.AspNetCore.Components;
// ...
[Inject]
public NavigationManager MyNavigationManager {get; set;} = default!;

Sample

@page "/navigate"
@inject NavigationManager MyNavigationManager

<h1>Current URL</h1>

<p>@(MyNavigationManager.Uri)</p>

More about navigation (NavigateTo, BaseUri, ToAbsoluteUri, ToBaseRelativePath, … ) at: URI and navigation state helpers

NavigationManager cheatsheet

MyNavigationManager.Uri
#> https://localhost:5001/counter/3?q=hi

MyNavigationManager.BaseUri
#> https://localhost:5001/

MyNavigationManager.NavigateTo("http://new location")
#> Navigates to new location

MyNavigationManager.LocationChanged
#> An event that fires when the navigation location has changed.

MyNavigationManager.ToAbsoluteUri("pepe")
#> https://localhost:5001/pepe

MyNavigationManager.ToBaseRelativePath(MyNavigationManager.Uri)
#> counter/3?q=hi

Helper: AddQueryParm( "q2", "bye" ) // (*1)
#> https://localhost:5001/counter/3?q=hi&q2=bye

Helper: GetQueryParm( "q" )
#> hi

(*1) Net6 introduces GetUriWithQueryParameter. More info: Manipulate the query string from Blazor

Helpers code:

@code {

    [Parameter]
    public string Id { get; set; }

    // Blazor: add parm to URL
    string AddQueryParm(string parmName, string parmValue)
    {
        var uriBuilder = new UriBuilder(MyNavigationManager.Uri);
        var q = System.Web.HttpUtility.ParseQueryString(uriBuilder.Query);
        q[parmName] = parmValue;
        uriBuilder.Query = q.ToString();
        var newUrl = uriBuilder.ToString();
        return newUrl;
    }

    // Blazor: get query parm from the URL
    string GetQueryParm(string parmName)
    {
        var uriBuilder = new UriBuilder(MyNavigationManager.Uri);
        var q = System.Web.HttpUtility.ParseQueryString(uriBuilder.Query);
        return q[parmName] ?? "";
    }

}