在WPF中获取ComboBox中的属性值

Question

我有一个comboBox，它被绑定到列表（来自数据库，使用实体框架）。我想在comboBox的AdId上获得所选项目（对象）的SelectionChanged。

public class Ad
{          
    public int AdId { get; set; }
    public string AdContent { get; set; }
}

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBox cmd = (ComboBox) sender;
    int AdId = cmd.SelectedItem;

    ???????????? I'm stuck here how to get AdId from SelectedItem... tried SelectedValue and SelectedValuePath... didn't work
}

Answer 1

ComboBox的cmd.SelectedItem属性将返回一个对象，您可以将它们转换为您自己的业务对象。然后您可以轻松访问其属性，如下所示：

int AdId = ((Ad)cmd.SelectedItem).AdId ;
string AdContent =  ((Ad)cmd.SelectedItem).AdContent; 

Answer 2

设置SelectedValuePath="AdId"

从代码中获取选定的值，如下所示

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBox cmd = (ComboBox) sender;
    int AdId = (int)cmd.SelectedValue;


}