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+using F9WebAiTest.Application.Common.Exceptions;
+using F9WebAiTest.Application.Interfaces.SnowflakeID;
+using F9WebAiTest.Application.Interfaces.UOW;
+using F9WebAiTest.Domain.Entities.SYS.Departments;
+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_UpdateCommand(long Id, string UserName, string PhoneNumber, string LoginName, long DepartmentId, int SortOrder) : IRequest<bool>;
+
+/// <summary>命令处理器</summary>
+public class User_UpdateCommandHandler(
+    IUnitOfWork_F9 unitOfWork,
+    ISnowflakeIdGenerator snowflakeIdGenerator,
+    IUserWriteRepository userWriteRepository,
+    IDepartmentUserRepository departmentUserRepository) : IRequestHandler<User_UpdateCommand, bool>
+{
+    public async Task<bool> Handle(User_UpdateCommand command, CancellationToken cancellationToken)
+    {
+        if (command.Id <= 0) throw new F9OperationException("用户ID不能为空");
+        if (string.IsNullOrWhiteSpace(command.UserName)) throw new F9OperationException("用户名不能为空");
+        if (command.DepartmentId <= 0) throw new F9OperationException("部门不能为空");
+
+        return await unitOfWork.ExecuteWithUow(async () =>
+        {
+            // 获取数据库用户
+            var dbUser = await userWriteRepository.GetByIdAsync(command.Id);
+            if (dbUser == null) throw new F9NotFoundException("用户", command.Id);
+
+            // 移除原部门关系
+            await departmentUserRepository.RemoveAsync(dbUser.DepartmentId, dbUser.Id);
+
+            // 领域更新
+            dbUser.Update(command.UserName, command.PhoneNumber, command.LoginName, command.DepartmentId, command.SortOrder);
+
+            // 持久化
+            var result = await userWriteRepository.UpdateAsync(dbUser);
+
+            // 添加新部门关系
+            await departmentUserRepository.AssignAsync(new DepartmentUser(
+                snowflakeIdGenerator.CreateId(), dbUser.DepartmentId, dbUser.Id));
+
+            return result;
+        });
+    }
+}