Question

在EFCore 1.1中，有.Include

        var q = (from o in context.Company
                 where o.Id == CompanyId && !o.IsDelete
                 select o)
                .Include(x => x.Personnel)
                .ThenInclude(x => x.HomeAddress)
                .First();

但.Include和.ThenInclude仅允许属性。我想创建一个扩展方法来修改原始行为以排除IsDelete（数据库是软删除）

    public static IIncludableQueryable<TEntity, TProperty> AlongWith<TEntity, TProperty>(this IQueryable<TEntity> source, Expression<Func<TEntity, TProperty>> navigationPropertyPath) where TEntity : Domain.EntityBase
    {
        // original EFCore 1.1 .Include(..) behavior
        var result = source.Include(navigationPropertyPath);
        return result;
    }

我的目标是创建一个类似于navigationPropertyPath的表达式，但包括对IsDelete的检查

        // 1. Create the expression for IsDelete == false
        var type = typeof(Domain.EntityBase);
        ParameterExpression pe = Expression.Parameter(type, "personnel");
        var left = Expression.Property(pe, type.GetProperty("IsDelete"));
        var right = Expression.Constant(false);
        var predicateBody = Expression.Equal(left, right);

        // 2. Attempt to append the IsDelete check from step 1
        var lambda = Expression.Lambda(navigationPropertyPath.Body, pe);
        // error: System.InvalidOperationException
        var navigationPropertyPathWithDeleteFalse = Expression.And(lambda, predicateBody);

是否可以为navigationPropertyPath附加&& !IsDelete？

修改EFCore 1.1 Include和ThenInclude行为

0 个答案: