在Silverlight中将xml数据重新引用到组合框 [英] re-referencing xml data to combobox in silverlight

问题描述

大家好，

我为此感到难过.

在我的silvelrght应用程序上，我有2个组合框，应该从xml数据表填充.因此，让我们说一个数据样本:

Hi All,

I''m stumped with this one.

on my silvelrght app, I have 2 comboboxes, that are supposed to populate from an xml data sheet. So lets say here''s a data sample:

<model name="Accord 4DR">
    <code name="CP2E6CE" />
    <code name="CP2F6CE" />
    <code name="CP2F7CJ" />
    <code name="CP2F8CJN" />
    <code name="CP2F8CKN" />
    <code name="CP3F8CJN" />
    <code name="CP3F8CKN" />
  </model>

  <model name="Civic 2DR">
    <code name="FG3A4CE" />
    <code name="FG3B4CE" />
    <code name="FG3A5CJ" />
    <code name="FG3B5CJ" />
    <code name="FG3B9CKN" />
    <code name="FG4A5CK" />
  </model>

对于第一个组合框，其填充如下:

For the first combobox, it populates likes this:

protected override void OnNavigatedTo(NavigationEventArgs e)
       {

           XDocument xml = XDocument.Load("modelcodes.xml");
           foreach (XElement element in xml.Descendants("model"))
           {
             CarTypeCB.Items.Add(element.FirstAttribute.Value);
           }
       }

现在，第二个组合框需要填充我在第一个组合框的SelectionChanged上所做的任何选择的后代.我无法弄清楚什么是正确的语法，基本上使用SelectedItem.Value告诉它从哪里获取后代.我想做类似的事情，所以我说类似:

Now, the second combobox needs to populate with the descendants of whatever selection I make on SelectionChanged of the first combobox. I cant figure out what the right syntax is for basically using the SelectedItem.Value to tell it where to get the descendants from. I want to do something similar so, id say something like:

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           ModelCodeCB.IsEnabled = true;
           XDocument xml = XDocument.Load("modelcodes.xml");

           var query = from selection in xml.Descendants("model")
                       where (string)selection == (ModelCodeCB.SelectedValue)
                       from codes in selection.Elements("code")
                       select codes;

           foreach (XElement codes in query.Descendants("code"))
           {
               ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
           }
       }

但它似乎没有响应，也没有填充组合框.正确的语法是什么?

but it doesnt seem to respond and it doesn''t populate the combobox. What would the proper syntax be?

推荐答案

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ModelCodeCB.IsEnabled = true;
            XDocument xml = XDocument.Load("modelcodes.xml");
 
            var query = from selection in xml.Descendants("model")
                        where (string)selection == (ModelCodeCB.SelectedValue)
                        from codes in selection.Elements("code")
                        select codes;
             
            foreach (XElement codes in query.Descendants("code"))
            {
                ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
            }
        }

尝试替换为:

Try to replace for this:

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ModelCodeCB.IsEnabled = true;
            XDocument xml = XDocument.Load("modelcodes.xml");
 
            var query = from selection in xml.Descendants("model")
                        where (string)selection == (ModelCodeCB.SelectedValue.ToString())
                        from codes in selection.Elements("code")
                        select codes;
             
            foreach (XElement codes in query)
            {
                ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
            }
        }

希望对您有所帮助.

Hope it helps.

这篇关于在Silverlight中将xml数据重新引用到组合框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！