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+using F9WebAiTest.Application.Common.Exceptions;
+using F9WebAiTest.Application.Interfaces.Security;
+using F9WebAiTest.Application.Interfaces.SnowflakeID;
+using F9WebAiTest.Application.Interfaces.UOW;
+using F9WebAiTest.Domain.Entities.SYS.Departments;
+using F9WebAiTest.Domain.Entities.SYS.RBAC;
+using F9WebAiTest.Domain.Interfaces.SYS.Departments;
+using F9WebAiTest.Domain.Interfaces.SYS.RBAC.Users;
+using MediatR;
+
+namespace F9WebAiTest.Application.CQRS.SYS.RBAC.Users.Commands;
+
+/// <summary>命令定义</summary>
+public record User_CreateCommand(string UserName, string PhoneNumber, string LoginName, long DepartmentId, int SortOrder) : IRequest<long>;
+
+/// <summary>命令处理器</summary>
+public class CreateUserCommandHandler(
+    IUnitOfWork_F9 unitOfWork,
+    IUserWriteRepository userRepository,
+    IDepartmentWriteRepository departmentWriteRepository,
+    IDepartmentUserRepository departmentUserRepository,
+    IPasswordHasher passwordHasher,
+    ISnowflakeIdGenerator snowflakeIdGenerator,
+    IPublisher eventBus) : IRequestHandler<User_CreateCommand, long>
+{
+    public async Task<long> Handle(User_CreateCommand command, CancellationToken cancellationToken)
+    {
+        // 手写校验
+        if (string.IsNullOrWhiteSpace(command.UserName)) throw new F9OperationException("用户名不能为空");
+        if (string.IsNullOrWhiteSpace(command.LoginName)) throw new F9OperationException("登录名不能为空");
+        if (command.DepartmentId <= 0) throw new F9OperationException("部门不能为空");
+
+        User createdUser = null;
+        var ok = await unitOfWork.ExecuteWithUow(async () =>
+        {
+            // 1. 验证部门是否存在（应用层协调）
+            var department = await departmentWriteRepository.GetByIdAsync(command.DepartmentId, cancellationToken);
+            if (department == null) throw new F9NotFoundException("部门不存在");
+
+            // 2. 创建用户聚合根
+            var user = new User(
+                id: snowflakeIdGenerator.CreateId(),
+                command.UserName,
+                command.PhoneNumber,
+                command.LoginName,
+                command.DepartmentId,
+                command.SortOrder);
+
+            // 设置默认密码
+            var defaultPasswordMd5 = passwordHasher.GetMd5Hash(user.GetDefaultPasswordText());
+            var passwordHash = passwordHasher.HashPassword(defaultPasswordMd5);
+            user.SetPassword(passwordHash);
+
+            await userRepository.AddAsync(user);
+
+            // 3. 创建部门用户关联
+            var depUser = new DepartmentUser(snowflakeIdGenerator.CreateId(), command.DepartmentId, user.Id);
+            await departmentUserRepository.AssignAsync(depUser);
+
+            createdUser = user;
+            return true;
+        });
+
+        if (!ok) throw new F9OperationException("用户", "新增");
+
+        // 4. 事务提交后发布领域事件
+        foreach (var domainEvent in createdUser.DomainEvents)
+            await eventBus.Publish(domainEvent, cancellationToken);
+        createdUser.ClearDomainEvents();
+
+        return createdUser.Id;
+    }
+}