问题描述： 在ASP.NET Core Web API中，使用Blazor项目进行JWT身份验证时，出现了“[authorize]”错误。

解决方法：

1. 确保在Blazor项目的Startup.cs文件中正确配置了身份验证和授权。

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;

namespace YourBlazorProject
{
    public class Startup
    {
        // ...

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                .AddJwtBearer(options =>
                {
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuer = true,
                        ValidateAudience = true,
                        ValidateLifetime = true,
                        ValidateIssuerSigningKey = true,
                        ValidIssuer = "your_issuer",
                        ValidAudience = "your_audience",
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your_secret_key"))
                    };
                });

            // ...

            services.AddControllers();
            services.AddRazorPages();
            services.AddServerSideBlazor();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            // ...

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
            });
        }
    }
}

2. 在需要授权的API端点或页面上添加[Authorize]属性。

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace YourBlazorProject.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class YourApiController : ControllerBase
    {
        // ...

        [HttpGet]
        [Authorize] // 添加授权属性
        public IActionResult Get()
        {
            // 处理逻辑
            return Ok();
        }
    }
}

这样，只有经过身份验证的用户才能访问带有[Authorize]属性的API端点或页面。