仅从ItemDataBound Telerik的下拉列表中填充唯一值

Question

我有一个RadGrid，我用发货信息从SQL数据库中填充了该数据，并且我试图用显示在网格上的每个城市填充一个下拉框。我一直无法弄清楚如何确保这些值是唯一的。

获得此结果的当前代码：

def numberreplace(row,k):
    matches = {'FIRST':'1ST',
                   'SECOND':'2ND',
                   'THIRD':'3RD',
                   'FOURTH':'4TH',
                   'FIFTH':'5TH',
                   'SIXTH':'6TH',
                   'SEVENTH':'7TH',
                   'EIGTH':'8TH',
                   'NINTH':'9TH',
                   'TENTH':'10TH'}
    if (' '+k+'' in row) or (row.startswith(k)):
        row = row.replace(k, matches[k])
        return row
    return row
    
    nummatches = ['FIRST','SECOND','THIRD','FOURTH','FIFTH','SIXTH','SEVENTH','EIGHTH','NINTH','TENTH]
    for match in nummatches:
        data['STREET REFORMAT'] = data['STREET REFORMAT'].apply(numberreplace(match))
        

我无法在网上找到任何东西，可能只是在搜索错误的问题。

Answer 1

只需添加其他检查项是否已经存在：

if (e.Item is GridDataItem)
    {
        GridDataItem item = (GridDataItem)e.Item;
        if(DropDownList1.Items.FindByValue(item["shipCity"].Text) == null)
            DropDownList1.Items.Add(item["shipCity"].Text);
    }