NavigationManagerExtensions.cs

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.WebUtilities;

namespace LockEscape;

public static class NavigationManagerExtensions
{
    public static bool TryGetQueryString<T>(this NavigationManager navManager, string key, out T value)
    {
        var uri = navManager.ToAbsoluteUri(navManager.Uri);

        if (QueryHelpers.ParseQuery(uri.Query).TryGetValue(key, out var valueFromQueryString))
        {
            if (typeof(T) == typeof(int) && int.TryParse(valueFromQueryString, out var valueAsInt))
            {
                value = (T)(object)valueAsInt;
                return true;
            }

            if (typeof(T) == typeof(string))
            {
                value = (T)(object)valueFromQueryString.ToString();
                return true;
            }

            if (typeof(T) == typeof(decimal) && decimal.TryParse(valueFromQueryString, out var valueAsDecimal))
            {
                value = (T)(object)valueAsDecimal;
                return true;
            }
        }

        value = default!;
        return false;
    }
}