HashTable一個小例子

頁面添加兩個ListBox控件

private static Hashtable parmCache=Hashtable.Synchronized(new Hashtable());
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            SqlParameter[] parmsA=new SqlParameter[] 
            {
                new SqlParameter("@tabAid",SqlDbType.Int),
                new SqlParameter("@tabAname",SqlDbType.NVarChar,20)
            };
            SqlParameter[] parmsB=new SqlParameter[]
            {
                new SqlParameter("@tabBid",SqlDbType.Int),
                new SqlParameter("@tabBname",SqlDbType.NVarChar,20),
                new SqlParameter("@tabBdate",SqlDbType.DateTime)
            };
            SqlParameter[] parmsC=new SqlParameter[]
            {
                new SqlParameter("@tabCid",SqlDbType.Int),
                new SqlParameter("@tabCname",SqlDbType.NVarChar,20)
            };

            CacheParameters("TableA",parmsA);
            CacheParameters("TableB",parmsB);
            CacheParameters("TableC",parmsC);
            foreach(DictionaryEntry dic in parmCache)
            {
                ListBox1.Items.Add(dic.Key.ToString());
            }
        }
    }
    protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlParameter[] parms=GetCacheParameters(ListBox1.SelectedValue);
        ListBox2.Items.Clear();
        foreach(SqlParameter parm in parms)
        {
            ListBox2.Items.Add(parm.ParameterName);
        }
    }

    public static void CacheParameters(string CaceheKey,params SqlParameter[] commandParas)
    {
        parmCache[CaceheKey]=commandParas;
    }

    public static SqlParameter[] GetCacheParameters(string cacheKey)
    {
        SqlParameter[] cacheParms=(SqlParameter[])parmCache[cacheKey];
        if(cacheParms==null)
        {
            return null;
        }
        return cacheParms;
    }