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>