实体框架4:保存层次模型的更有效方法

Product[].properties
         .SET1[].properties
         .SET2[].properties
                .SETA[].properties
                .SETA[].SETb[].properties

当我去保存这个时,我有以下流程:

Grab DB Product that matches current
Update Properties
Grab and loop through set 1 from DB
    If not found in "to save" set, delete item from set 1
    If found, update it
Grab and loop through set 2 from DB
    If not found in "to save" set, delete item from set 2
    If found, update it
    While we are in Set 2, grab all Set A from DB
        If not found in "to save" set, delete it from set A
        If found, update it
        While we are in Set A, grab all Set b in DB
            If not found in "to save" set, delete it from set b
            If found, update it

Now go back through and insert any in local set not in DB

这一定是我见过的最糟糕的更新算法。有谁有更好的代码或链接,可以更简单一点?当前正在使用C#