学用 ASP.Net 之 System.Collections.Specialized.OrderedDictionary 类

OrderedDictionary 相当于能用索引访问的哈希表.
主要成员:

/* 属性 */
Count;  //元素数
Keys;   //键集合
Values; //值集合

/* 方法 */
Add();      //添加
Clear();    //清空
Contains(); //是否包含
CopyTo();   //将指定元素复制到数组
Insert();   //插入
Remove();   //根据键删除
RemoveAt(); //根据索引删除

练习:

protected void Button1_Click(object sender, EventArgs e)
{
    OrderedDictionary od = new OrderedDictionary();
    od.Add("k1", 111);
    od.Add("k2", 222);
    od.Add("k3", 333);

    string s1 = od["k2"].ToString(); //222
    string s2 = od[1].ToString();    //222

    string s3 = "", s4 = "";

    for (int i = 0; i < od.Count; i++) {
        s3 += od[i].ToString() + "; ";   //111; 222; 333; 
    }

    foreach (DictionaryEntry de in od)
    {
        s4 += string.Format("{0}:{1}; ", de.Key, de.Value);
    }
    TextBox1.Text = s1 + "\n" + s2 + "\n" + s3 + "\n" + s4; //k1:111; k2:222; k3:333; 
}