以下是在Blazor Server端上实现身份验证但无需使用Identity模板的示例代码：

1. 创建自定义登录组件

创建名为Login.razor的组件，并添加以下代码：

@page "/login"

Login


    
    

    

        Username
        
    

    

        Password
        
    

    Login


@code {
    private LoginModel loginModel = new LoginModel();

    private async void HandleValidSubmit()
    {
        var result = await _authService.LoginAsync(loginModel);
        if (result.Succeeded)
        {
            NavigationManager.NavigateTo("/");
        }
        else
        {
            // Handle login failure
        }
    }
}

public class LoginModel
{
    [Required(ErrorMessage = "Username is required")]
    public string Username { get; set; }

    [Required(ErrorMessage = "Password is required")]
    public string Password { get; set; }
}

2. 在Startup.cs文件中添加Auth服务的依赖注入

在Startup.cs文件的ConfigureServices方法中添加以下代码：

services.AddScoped();
services.AddScoped();

3. 创建自定义身份验证状态提供程序

创建名为CustomAuthenticationStateProvider.cs的类，并添加以下代码：

public class CustomAuthenticationStateProvider : AuthenticationStateProvider
{
    private readonly IAuthService _authService;

    public CustomAuthenticationStateProvider(IAuthService authService)
    {
        _authService = authService;
    }

    public override async Task GetAuthenticationStateAsync()
    {
        var user = await _authService.GetUserAsync();
        if (user != null)
        {
            var identity = new ClaimsIdentity(new[]
            {
                new Claim(ClaimTypes.Name, user.Username),
            }, "apiauth_type");
            var principal = new ClaimsPrincipal(identity);
            return new AuthenticationState(principal);
        }

        return new AuthenticationState(new ClaimsPrincipal());
    }

    public void NotifyAuthenticationStateChanged()
    {
        NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
    }
}

4. 创建自