问Blazor服务器端应用程序的SignIn无法工作

EN

@code {
    Dictionary fieldsetAttr =
        new Dictionary()
        {
            {"class", "form-group" }
        };

    Dictionary usernameAttr =
        new Dictionary()
        {
            {"class", "form-control" },
            {"type", "text" },
            {"placeholder", "Enter your user name here." }
        };

    Dictionary passwordInput =
        new Dictionary()
        {
            {"class", "form-control" },
            {"type", "password" }
        };

    Dictionary buttonAttr =
        new Dictionary()
        {
            {"type", "button" }
        };

    Dictionary invalidAttr =
        new Dictionary()
        {
            {"class", "" },
            {"style", "color: red;" }
        };

    Dictionary validAttr =
        new Dictionary()
        {
            {"class", "" },
            {"style", "color: green;" }
        };

}

@inject SignInManager signInManager
@inject UserManager userManager


    
        
            Login
            Username

            

            Password

            

            @ButtonText
            @if (errorMessage != null && errorMessage.Length > 0)
            {
                
                    @errorMessage
                
            }
            else if(successMessage != null && successMessage.Length > 0)
            {
                
                    @successMessage
                
            }
        
    


@code {

    string successMessage = "";

    private async Task LoginUser()
    {
        if(!String.IsNullOrEmpty(UserName))
        {
            var user = await userManager.FindByNameAsync(UserName);
            var loginResult =
                await signInManager.CheckPasswordSignInAsync(user, Password, false);



            if(loginResult.Succeeded)
            {
                await signInManager.SignInAsync(user, true);
                successMessage = $"{UserName}, signed in.";
                errorMessage = "";
            }
            else
            {
                successMessage = "";
                errorMessage = "Username or password is incorrect.";
            }
        }
        else
        {
            successMessage = "";
            errorMessage = "Provide a username.";
        }
    }

    [Parameter]
    public Dictionary FormParentAttr { get; set; }

    [Parameter]
    public Dictionary LoginFormAttr { get; set; }

    [Parameter]
    public Dictionary FieldsetAttr { get; set; }

    [Parameter]
    public Dictionary UsernameAttr { get; set; }

    [Parameter]
    public Dictionary PasswordAttr { get; set; }

    [Parameter]
    public Dictionary ButtonAttr { get; set; }

    [Parameter]
    public Dictionary InvalidAttr { get; set; }

    private string UserName { get; set; }
    private string Password { get; set; }

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

    [Parameter]
    public Dictionary ValidAttr { get;set; }

    public string errorMessage { get; set; }

}