Blazor提供了一种简单的方式来实现授权和身份验证。可以通过使用内置的AuthenticationStateProvider、AuthorizeView和Authorize属性轻松地实现此目标。下面是实现Blazor授权和身份验证的示例代码：

1. 在Startup.cs中将AddAuthorization添加到服务集合中：

services.AddAuthorization();

2. 实现自定义的身份验证状态提供程序（AuthenticationStateProvider），该提供程序继承AuthenticationStateProvider并实现GetAuthenticationStateAsync方法：

public class CustomAuthenticationStateProvider : AuthenticationStateProvider
    {
        private readonly HttpContextAccessor httpContextAccessor;

        public CustomAuthenticationStateProvider(HttpContextAccessor httpContextAccessor)
        {
            this.httpContextAccessor = httpContextAccessor;
        }

        public override async Task GetAuthenticationStateAsync()
        {
            // Check if user is authenticated
            bool isAuthenticated = httpContextAccessor.HttpContext.User.Identity.IsAuthenticated;
            ClaimsIdentity identity;

            if (isAuthenticated)
            {
                // Get user claims
                List claims = new List
                {
                    new Claim(ClaimTypes.Name, httpContextAccessor.HttpContext.User.Identity.Name)
                };

                identity = new ClaimsIdentity(claims, "Custom Authentication");
            }
            else
            {
                identity = new ClaimsIdentity();
            }

            return await Task.FromResult(new AuthenticationState(new ClaimsPrincipal(identity)));
        }
    }

3. 在服务集合中添加自定义身份验证状态提供程序：

services.AddScoped();

4. 在Index.razor页面中，使用AuthorizeView标记控制对页面的访问权限：

    
        
Welcome, @context.User.Identity.Name!
        Logout
    
    
        
You are not authorized to access this page.
    


@code {
    private async Task Logout()
    {
        // Perform logout action
    }
}

5. 在Login.razor页面中，