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backend/F9WebAiTest.Application/CQRS/SYS/RBAC/Users/Commands/UserRole_AssignCommand.cs

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+using F9WebAiTest.Application.Common.Exceptions;
+using F9WebAiTest.Application.Interfaces.SnowflakeID;
+using F9WebAiTest.Domain.Entities.SYS.RBAC;
+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 UserRole_AssignCommand(long UserId, long RoleId) : IRequest<long>;
+
+/// <summary>命令处理器</summary>
+public class UserRole_AssignCommandHandler(
+    IUserRoleWriteRepository userRoleWriteRepository,
+    IUserWriteRepository userWriteRepository,
+    ISnowflakeIdGenerator snowflakeIdGenerator,
+    IPublisher eventBus) : IRequestHandler<UserRole_AssignCommand, long>
+{
+    public async Task<long> Handle(UserRole_AssignCommand command, CancellationToken cancellationToken)
+    {
+        if (command.UserId <= 0) throw new F9OperationException("用户ID不能为空");
+        if (command.RoleId <= 0) throw new F9OperationException("角色ID不能为空");
+
+        var newEntity = new UserRole(snowflakeIdGenerator.CreateId(), command.UserId, command.RoleId);
+
+        var user = await userWriteRepository.GetByIdAsync(command.UserId);
+        if (user == null) throw new F9NotFoundException("用户", command.UserId);
+        user.AddRole(newEntity.Id);
+
+        var result = await userRoleWriteRepository.AssignAsync(newEntity);
+        if (result == false) throw new F9OperationException("权限", "绑定");
+
+        // 发布领域事件
+        foreach (var domainEvent in user.DomainEvents)
+            await eventBus.Publish(domainEvent, cancellationToken);
+        user.ClearDomainEvents();
+
+        return newEntity.Id;
+    }
+}