IM_NEW/IM.InitCommon/SwaggerGenExtension.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.OpenApi.Models;

namespace IM.InitCommon
{
    public static class SwaggerGenExtension
    {
        public static IServiceCollection AddSwaggerGenOpt(this IServiceCollection services)
        {
            return services.AddSwaggerGen(options =>
            {
                // 1. 定义安全定义 (Security Definition)
                options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
                {
                    Name = "Authorization",
                    Type = SecuritySchemeType.Http,
                    Scheme = "bearer",
                    BearerFormat = "JWT",
                    In = ParameterLocation.Header,
                    Description = "请输入 JWT Token，不需要输入 'Bearer ' 前缀，系统会自动添加。"
                });

                // 2. 开启全局安全要求 (Security Requirement)
                // 这样 Swagger UI 所有的接口都会出现锁头图标
                options.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            new string[] {}
        }
    });
            });
        }
    }
}