How do you get the current URL in a Blazor component?

Inject NavigationManager in razor.

@inject NavigationManager NavigationManager

Use Uri from NavigationManager to get the current URL.

string currentUrl = NavigationManager.Uri;

Sample code

@page "/sample"
@inject NavigationManager NavigationManager

<p>@currentUrl</p>

@code {
    private string currentUrl;

    protected override void OnInitialized()
    {
        currentUrl = NavigationManager.Uri;
    }
}