MudBlazorApp/TestApp02/Pages/LoginMud.razor.cs

using Microsoft.AspNetCore.Components;
using System.ComponentModel.DataAnnotations;
using TestApp02.Data;
using System.Web;

namespace TestApp02.Pages
{
    public class LoginModel: ComponentBase
    {
        [Inject] NavigationManager _navigationManager { get; set; }

        //private BiudAuthService _BiudAuthService;
        [Inject] BiudAuthService _BiudAuthService { get; set; }

        //public LoginModel(BiudAuthService pBiudAuthService)
        public LoginModel()
        {

            loginAccountForm= new LoginAccountForm();
        }


        public LoginAccountForm loginAccountForm { get; set;}

        protected async Task OnPostAsync()
        {
            string _uName = encode(loginAccountForm.Username);
            string _uPass = encode(loginAccountForm.Password);

            _navigationManager.NavigateTo("/login?paramUsername="+ _uName + "&paramPassword=" + _uPass, true);
        }

        private string encode(string param)
        {
            return HttpUtility.UrlEncode(param);
        }
    }

    public class LoginAccountForm
    {
        [Required (ErrorMessage = "Необходим логин")]
        [StringLength(30, ErrorMessage = "Допустимая длина логина от 3 до 30 символов ", MinimumLength = 3)]
        public string Username { get; set; }

        [Required(ErrorMessage = "Необходим пароль")]
        [StringLength(30, ErrorMessage = "Допустимая длина пароля от 3 до 30 символов ", MinimumLength = 3)]
        public string Password { get; set; }

    }
}