c# - 当对象的属性发生变化时执行一个函数

Question

我有一个看起来像这样的对象模型：

public class MyModel
{
    public List<MyOtherObject> TheListOfOtherObjects { get; set; }

    public List<int> MyOtherObjectIDs { get; set; }

    public void GetListOfMyOtherObjectIDs() 
    {
       // function that extracts the IDs of objects in
       // the list and assigns it to MyOtherObjectIDs
    }
}

目前，我有一些代码在从查询中填充GetListOfMyOtherObjectIDs时执行。TheListOfOtherObjects现在我在代码中的另一个位置也填充了这个列表，当它出现时，它还需要执行该GetListOfMyOtherObjectIDs函数。

有没有办法使这个过程自动化，以便在TheListOfOtherObjects填充时，无论哪个代码触发它，对象模型都会自动执行GetListOfMyOtherObjectIDs？

Answer 1

使用您自己的set访问器：

public class MyModel
{
    private List<MyOtherObject> _TheListOfOtherObjects;
    public List<MyOtherObject> TheListOfOtherObjects {
        get { return _TheListOfOtherObjects; }
        set { _TheListOfOtherObjects = value; GetListOfMyOtherObjectIDs(); }
    }

    public List<int> MyOtherObjectIDs { get; set; }

    public void GetListOfMyOtherObjectIDs() 
    {
       // function that extracts the IDs of objects in
       // the list and assigns it to MyOtherObjectIDs
    }
}