class SortGrid 
{
    int indexI;
    int indexJ;

    public SortGrid(int x, int y)
    {
        indexI = x;
        indexJ = y;
    }

    public int IndexI { get ; set ; }

    public int IndexJ { get ; set ;}
}

   //排序测试
    void SortTest () {
        Debug.Log ("C#对象内部属性排序测试:");
        SortGrid sg2 = new SortGrid (5, 4);
        SortGrid sg1 = new SortGrid (1, 6);
        SortGrid sg3 = new SortGrid (3, 2);

        List<SortGrid> lsg = new List<SortGrid> ();
        lsg.Add (sg1);
        lsg.Add (sg2);
        lsg.Add (sg3);

        lsg.Sort (delegate(SortGrid x, SortGrid y)
　　　　 {
            return x.IndexI.CompareTo(y.IndexI);
        });
        foreach (var item in lsg) {
            Debug.Log("indexI:" + item.IndexI);
        }

        lsg.Sort (delegate(SortGrid x, SortGrid y) {
            return y.IndexI.CompareTo(x.IndexI);
        });
        foreach (var item in lsg) {
            Debug.Log("indexI:" + item.IndexI);
        }
    }

    // Use this for initialization
    void Start () {
        SortTest ();
    }