public IQueryable <TEntity> GetMany(ISpecification <TEntity> spec)
{
// 获取包含所有基于表达式的包含的可查询项
var queryableResultWithIncludes = spec.Includes
.Aggregate(_dbContext.Set <TEntity>().AsQueryable(), (current, include) => current.Include(include));
// 获取包含所有基于表达式的include的可查询项，修改可查询项以包含任何基于字符串的include语句
var secondaryResult = spec.IncludeStrings
.Aggregate(queryableResultWithIncludes,
(current, include) => current.Include(include));
// 使用规范的条件表达式返回查询的结果
return(secondaryResult
.Where(spec.Criteria)
);
}
public Repository(STSysContext dbContext)
{
_dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
_dbSet = _dbContext.Set <TEntity>();
}