防止在Inno Setup中的列表框和组合框中出现重复项? [英] Prevent duplicate items in list box and combo box in Inno Setup?
问题描述
我从互联网上收到一个XML文件(XML的值可能会有所不同,因为存在货币).然后,我将其加载到列表框1.用户可以使用一些按钮(一个,一个,全部,删除等)将项目添加到列表框2.所以我想防止重复.我找不到任何办法.
I receive an XML file from internet (values from XML may vary, cause there are currencies). And then I load it to a list box 1. A user can add items to to list box 2 with some buttons (one by one, all, delete etc). So I want to prevent duplicates. I can't find any way to do this.
我的列表框:
这是我的代码(有关XML解析的部分,请参见如何读取多个XML节点?(Inno设置)):
Here is my code (for XML parsing part, see How to read multiple XML nodes? (Inno Setup)):
XMLNodeList := XMLDocument.SelectNodes('//listaPaises/item');
for Index := 0 to XMLNodeList.length - 1 do
begin
XMLNode := XMLNodeList.item[Index];
{ Add country }
comboBoxPais.Items.Add(XMLNode.SelectSingleNode('name').Text);
{ Add currency }
listBoxMonedasDisponibles.Items.Add(XMLNode.SelectSingleNode('suggestedCurrency').Text);
listBoxMonedasDisponibles.ItemIndex := 0;
comboBoxPais.ItemIndex := 0;
end;
推荐答案
TComboBox.Items
和 TListBox.Items
均为 TStrings
使用 TStrings.IndexOf
,以测试给定的字符串是否已经存在.如果字符串不存在,它将返回一个负数(-1).
Use TStrings.IndexOf
, to test if a given string is already present. It returns a negative number (-1), if the string is not present.
{ Add S only, if not present already }
if comboBox.Items.IndexOf(S) < 0 then
comboBox.Items.Add(S);
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