感谢Jeffcky大佬的博客：

EntityFramework Core 2.0全局过滤 （HasQueryFilter） https://www.cnblogs.com/CreateMyself/p/8491058.html

什么是值对象

没有唯一的标识，固定不变的，表示一个具体的概念，用来描述一个东西的特征，代表是什么，使用时直接添加或替换，值对象在迁移时，会以字段的形式迁移到数据库中

软删除

定义删除的接口

         public interface ISoftDelete

         {

            bool IsDeleted { get; set; }

         }
     

创建模型实现ISoftDelete接口

       public class UserInfo : IAggregationRoot, ISoftDelete

        {

          public Guid Id { get; set; }

          public string UserName { get; private set; }

          public string UserPassword { get; private set; }

          public string UserPhone { get; private set; }

          public Address Address { get; private set; }

          public bool IsDeleted { get; set; }

        }

        [Owned]

        public class Address:IValueObject

        {

          public string Province { get;private set; }

          public string City { get; private set; }

          public string County { get; private set; }

          public string AddressDetails { get; private set; }

        }
     

Lamda的扩展以及Code First 迁移配置

    protected override void OnModelCreating(ModelBuilder modelBuilder)

        {

            //设置软删除

            foreach (var entityType in modelBuilder.Model.GetEntityTypes())

            {

                var parameter = Expression.Parameter(entityType.ClrType);

                //查询类上面是否有Owned（值对象）的特性

                var ownedModelType = parameter.Type;

                var ownedAttribute = Attribute.GetCustomAttribute(ownedModelType, typeof(OwnedAttribute));

                if (ownedAttribute == null)

                {

                    var propertyMethodInfo = typeof(EF).GetMethod("Property").MakeGenericMethod(typeof(bool));

                    var isDeletedProperty =

                        Expression.Call(propertyMethodInfo, parameter, Expression.Constant("IsDeleted"));

                    BinaryExpression compareExpression = Expression.MakeBinary(ExpressionType.Equal, isDeletedProperty,

                        Expression.Constant(false));

                    var lambda = Expression.Lambda(compareExpression, parameter);

                    modelBuilder.Entity(entityType.ClrType).HasQueryFilter(lambda);

                }

            }

        }
     

在这里需要过滤掉值对象的类，在值对象的类上面声明一个特性，通过该特性过滤掉该值对象， 如果该类是值对象就直接跳过，不过滤值对象EF CORE会给值对象附加一个IsDeleted的字段，EF CORE执行中会报错，提示找不到该字段

Owned是EF CORE 配置值对象的特性，可以去自定义特性，在每一个值对象上面声明，在OnModelCreating 过滤掉包含这个特性的类

最终实现的代码：

         public async Task>> GetUserList(SearchUserDto input)

         {

            Expression> where = e => e.IsDisable == false;

            if (!string.IsNullOrEmpty(input.SearchName))

            {

                where = where.And(e => e.UserName.Contains(input.SearchName));

            }
        if (!string.IsNullOrEmpty(input.SearchPwd))

        {

            where = where.And(e => e.UserPhone.Contains(input.SearchPwd));

        }

        var userList = await _userRepository.LoadEntityListAsync(where, e => e.UserName, "asc", input.PageIndex, input.Pagesize);

        var total = await _userRepository.GetEntitiesCountAsync(where);

        var userDtoList = userList.MapToList<UserInfo, UserDto>();

        HeaderResult<List<UserDto>> result = new HeaderResult<List<UserDto>>

        {

            IsSucceed = true,

            Result = userDtoList,

            Total = total

        };

        return result;

    }

 </pre>


DDD Code First 迁移数据实现EF CORE的软删除，值对象迁移配置的相关教程结束。