过滤下拉列表重复项

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            学校和朋友们一块做了个项目,碰到个从数据库获取项添加到下拉列表里的问题,重复项没法弄,不能给客户看到很多重复的选项啊,在网上找了很多,都是从底层开始解决的,可是现在项目都做差不多了,要是从底层开始弄就要从新开始,所以,自己想了个办法。

           我用的是vs2005和sql2005,用的三层架构,从显示层过滤的

 


        //过滤下拉列表重复项
        private void deletDouble(string columnName,DataSet ds)
        {
            Hashtable ht = new Hashtable();
            foreach (DataRow row in ds.Tables["salesinformation"].Rows)
            {
                object ob = row[columnName];
                if (ht[ob]==null)
                {
                    ht.Add(ob,ob);
                }
            }
            if (columnName == "managers")
            {
                foreach (object ob in ht.Values)
                {
                    this.cbbManagers.Items.Add(ob.ToString());
                }
            }
            if (columnName == "brand")
            {
                foreach (object ob in ht.Values)
                {
                    this.cbbBrand.Items.Add(ob.ToString());
                }
            }
            if (columnName == "salestype")
            {
                foreach (object ob in ht.Values)
                {
                    this.cbbSalestype.Items.Add(ob.ToString());
                }
            }
        }

        //填写下拉列表框的方法
        private void getCombobox(string combo)
        {
            string thisdate = DateTime.Now.ToString();
            DataSet ds = DangRiXiaoShouChaXunManager.getDangRiXiaoShouJiLu("", "", thisdate);
            if (combo == "managers")
            {
                this.cbbBrand.Items.Clear();
                this.cbbSalestype.Items.Clear ();
                deletDouble(combo,ds);
              
            }
            if (combo == "salestype")
            {
                this.cbbManagers.Items.Clear();
                this.cbbBrand.Items.Clear();
                deletDouble(combo,ds);
            }
            if (combo == "brand")
            {
                this.cbbManagers.Items.Clear();
                this.cbbSalestype.Items.Clear();
                deletDouble(combo,ds);
            }
        }

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