基于ef core 2.0的数据库增删改审计系统

1.首先是建审计存储表

CREATE TABLE [dbo].[Audit] (
    [Id] [uniqueidentifier] NOT NULL,
	[EntityName] [nvarchar](100),
	[OldValue] [nvarchar](max),
    [NewValue] [nvarchar](max),
    [StateName] [nvarchar](255),
    [CreatedBy] [nvarchar](255),
    [CreatedDate] [datetime] NOT NULL,
    CONSTRAINT [PK_dbo.Audit] PRIMARY KEY ([Id])
)

Go

　　并建立实体

/// <summary>
    /// AuditEntity
    /// </summary>
    public class AuditEntity : Entity
    {
        public AuditEntity()
        {
            this.EntityName = string.Empty;
            this.OldValue = string.Empty;
            this.NewValue = string.Empty;
            this.StateName = string.Empty;
            this.CreatedBy = string.Empty;
            this.CreatedDate = DateTime.Now;
        }
        public string EntityName { get; set; }
        /// <summary>
        ///　
        /// </summary>
        public string OldValue { get; set; }
        /// <summary>
        ///　
        /// </summary>
        public string NewValue { get; set; }
        /// <summary>
        ///　
        /// </summary>
        public string StateName { get; set; }
        /// <summary>
        ///　
        /// </summary>
        public string CreatedBy { get; set; }
        /// <summary>
        ///　
        /// </summary>
        public DateTime CreatedDate { get; set; }

    }

2.EF工作单元类的实现(百度有很多实现方式)

/// <summary>
    /// 工作单元接口
    /// </summary>
    public partial interface IUnitOfWork
    {
        bool Commit();
    }

/// <summary>
    /// 工作单元实现类
    /// </summary>
    public partial class UnitOfWork : IUnitOfWork, IDisposable
    {
        #region 数据上下文

        /// <summary>
        /// 数据上下文
        /// </summary>
        private BaseDbContext _context;
        private AuthUserModel _user;
        public UnitOfWork(BaseDbContext context, AuthUserModel user)
        {
            _context = context;
            _user = user;
        }

        #endregion
        public virtual bool Commit()
        {

            return _context.SaveChanges() > ;
        }
        public void Dispose()
        {
            if (_context != null)
            {
                _context.Dispose();
            }
            GC.SuppressFinalize(this);
        }
    }

这里的AuthUserModel是当前用户类

public class AuthUserModel
    {
        public string UserName { get; set; }
        public string UserId { get; set; }
        public string Role { get; set; }
    }

3.采用Autofac.Extras.DynamicProxy实现AOP

不知道Autofac.Extras.DynamicProxy能不能直接作用在方法上？

    public class AuditLog : IInterceptor
    {
        private AuthUserModel _user;
        private BaseDBContext _context;
        public AuditLog(AuthUserModel user, BaseDBContext context )
        {
            _user = user;
            _context = context;
        }
        public void Intercept(IInvocation invocation)
        {
            var a = _user;
            string name = invocation.Method.Name;
            if (name== "Commit")
            {
                try
                {
                    var list = new List<AuditEntity>();
                    var b = invocation.InvocationTarget as BaseUnitOfWork;
                    b.context.ChangeTracker.DetectChanges();
                    var changes = b.context.ChangeTracker.Entries().Where(x => x.State == EntityState.Added ||
                                                                             x.State == EntityState.Modified ||
                                                                             x.State == EntityState.Deleted);
                    foreach (var change in changes)
                    {
                        var temp = new AuditEntity()
                        {
                            CreatedBy = _user.UserName
                        };
                        //实体名称
                        temp.EntityName = change.Entity.GetType().Name;
                        // Entity Added
                        if (change.State == EntityState.Added)
                        {
                            temp.NewValue = JsonConvert.SerializeObject(change.Entity);
                            temp.StateName = "Added";
                            list.Add(temp);
                        }
                        // Entity Deleted
                        else if (change.State == EntityState.Deleted)
                        {
                            temp.OldValue = JsonConvert.SerializeObject(change.Entity);
                            temp.StateName = "Deleted";
                            list.Add(temp);
                        }

                        // Entity Modified
                        else if (change.State == EntityState.Modified)
                        {
                            //string newStr=  "{ " ;
                            string oldStr = "{ ";
                            foreach (var propertyEntry in change.Metadata.GetProperties())
                            {

                                //if (change.Property(prop.Name).IsModified)
                                //{
                                var PropertyName = propertyEntry.Name;
                                var currentValue = change.Property(propertyEntry.Name).CurrentValue;
                                var originalValue = change.Property(propertyEntry.Name).OriginalValue;
                                //newStr = newStr + "\"" + PropertyName + "\"" + ":" + "\"" + currentValue + "\"" + ",";
                                oldStr = oldStr + "\"" + PropertyName + "\"" + ":" + "\"" + originalValue + "\"" + ",";
                                //}
                            }
                            oldStr = oldStr.Remove(oldStr.Length - , );
                            oldStr = oldStr + "}";
                            //newStr = newStr.Remove(oldStr.Length - 1, 1);
                            //newStr = newStr + "}";
                            temp.OldValue = oldStr;
                            temp.NewValue = JsonConvert.SerializeObject(change.Entity);
                            temp.StateName = "Modified";
                            list.Add(temp);
                        }
                    }
                    invocation.Proceed();
                   //将list写入表
                    //。。。。
                }
                catch (Exception ex)
                {
                    throw;
                }
                finally
                {

                }
            }
            else
            {
                invocation.Proceed();
            }
        }
        public IEnumerable<KeyValuePair<string, object>> MapParameters(object[] arguments, ParameterInfo[] getParameters)
        {
            for (int i = ; i < arguments.Length; i++)
            {
                yield return new KeyValuePair<string, object>(getParameters[i].Name, arguments[i]);
            }
        }

    }     

使用AuditLog

 builder.RegisterType<AuditLog>();
 builder.RegisterType<UnitOfWork>()
                .As<IUnitOfWork>().EnableInterfaceInterceptors().InterceptedBy(typeof(AuditLog));

4.调用代码

 public class UserManagerApp
    {
        private IUnitOfWork _uow;

        public UserManagerApp(
            IUnitOfWork uow)
        {

            _uow = uow;
        }
        public void Delete(Guid[] ids)
        {
          //delete 方法
          //..........
         //提交事务
            _uow.Commit();
        }
}

[HttpDelete]
        [Authorize]
        public Response Delete(Guid[] ids)
        {
            var result = new Response();
            try
            {
                _app.Delete(ids);

            }
            catch (Exception ex)
            {

                result.Status = false;
                result.Message = ex.Message;
            }
            return result;
        }

5.测试

审计日志增加成功