在WPF（3.5sp1）中以编程方式设置ComboBox SelectedItem

问题描述

我在安装了Net Framework 3.5 sp1的wpf应用程序中设置SelectedItem programmaticaly时感到困惑。我仔细阅读了大约100篇帖子\topics，但仍然困惑（（
我的xaml：

I have been confused while setting SelectedItem programmaticaly in wpf applications with Net Framework 3.5 sp1 installed. I have carefully read about hundred posts \topics but still confused((My xaml:

 <ComboBox name="cbTheme">
    <ComboBoxItem>Sunrise theme</ComboBoxItem>
    <ComboBoxItem>Sunset theme</ComboBoxItem> 
 </ComboBox>

如果我在其中一个项目中添加 IsSelected =True属性，项目选择WHY？
我在代码中尝试不同，仍然无法设置所选项：

If I add IsSelected="True" property in one of the items - it's dosn't sets this item selected. WHY ?And i was try different in code and still can't set selected item:

cbTheme.SelectedItem=cbTheme.Items.GetItemAt(1); //dosn't work
cbTheme.Text = "Sunrise theme"; //dosn't work
cbTheme.Text = cbTheme.Items.GetItemAt(1).ToString();//dosn't work
cbTheme.SelectedValue = ...//dosn't work
cbTheme.SelectedValuePath = .. //dosn't work
//and even this dosn't work:
ComboBoxItem selcbi = (ComboBoxItem)cbTheme.Items.GetItemAt(1);//or selcbi = new ComboBoxItem
cbTheme.SelectedItem = selcbi;

SelectedItem不是只读属性，为什么它不工作？
我认为这应该是一个微软的问题，而不是我的。或者我错过了什么？我试着玩ListBox，所有工作正常与相同的代码，我可以设置选择，获得选择等等。所以，我能做ComboBox？

The SelectedItem is not readonly property, so why it wan't work?I think thats should be a Microsoft's problems, not my. Or I have missed something??? I have try playing with ListBox, and all work fine with same code, I can set selections, get selections and so on.... So what can I do with ComboBox ? Maybe some tricks ???

推荐答案

要选择 ComboBox中的任何项目

combobox.SelectedIndex = 0; //index should be the index of item which you want to be selected

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