Silverlight的空间Combobox的初步使用)

概述开始很简单的学了xmal代码如下：但是报错，不知道为什么? <ComboBox HorizontalAlignment="Left" VerticalAlignment="Bottom" x:Name="abc" SelectionChanged="abc_SelectionChanged"> <ComboBoxItem Content="1" IsSelected="T

开始很简单的学了xmal代码如下：但是报错，不知道为什么?

<ComboBox HorizontalAlignment="left"  VerticalAlignment="Bottom" x:name="abc" SelectionChanged="abc_SelectionChanged">            <ComboBoxItem Content="1" IsSelected="True" />            <ComboBoxItem Content="2" />            <ComboBoxItem Content="3"  />        </ComboBox>

在代码中获取值是报错的：

ComboBoxItem item = abc.SelectedItem as ComboBoxItem;            txt.Text = item.Content.ToString();

修改代码：不需要 IsSelected="True"也不需要 ItemsSource="{Binding}"才可以运行，但是我又想启动选择第二项。。。怎么办

然后再cs代码中通过abc.Selectedindex = 2;才有用，哎......

下面看看整个代码吧，很乱，一个是xmal初始内容数据，一个是绑定列表对象：

xmal如下：

<GrID x:name="LayoutRoot" Background="White" Height="228" WIDth="378">        <ComboBox x:name="cbbTest" Height="30" WIDth="100" ItemsSource="{Binding}" displayMemberPath="ID" SelectionChanged="select"/>        <TextBlock Height="30" WIDth="100" HorizontalAlignment="Center" VerticalAlignment="Bottom" x:name="txt"></TextBlock>        <ComboBox HorizontalAlignment="left"   VerticalAlignment="Bottom" x:name="abc" SelectionChanged="abc_SelectionChanged">            <ComboBoxItem Content="1"  />            <ComboBoxItem Content="2" />            <ComboBoxItem Content="3"  />        </ComboBox>    </GrID>

cs.如下：

using System;using System.Collections.Generic;using System.linq;using System.Net;using System.windows;using System.windows.Controls;using System.windows.documents;using System.windows.input;using System.windows.Media;using System.windows.Media.Animation;using System.windows.Shapes;namespace CombomBox{    public partial class MainPage : UserControl    {        public MainPage()        {            InitializeComponent();            getData();            abc.Selectedindex = 2;        }        List<Class1> lstSource = new List<Class1>();        private voID getData() {            lstSource.Add(new Class1 { ID="1",name="oracle"});            lstSource.Add(new Class1 { ID = "2",name = "java" });            lstSource.Add(new Class1 { ID = "3",name = "linux" });            lstSource.Add(new Class1 { ID = "4",name = "windows 8" });            cbbTest.ItemsSource = lstSource;            cbbTest.Selectedindex = 0;        }        private voID select(object sender,SelectionChangedEventArgs e)        {            string selectedID = (cbbTest.SelectedItem as Class1).name;            txt.Text = selectedID;        }        private voID abc_SelectionChanged(object sender,SelectionChangedEventArgs e)        {            ComboBoxItem item = abc.SelectedItem as ComboBoxItem;            txt.Text = item.Content.ToString();        }    }}

数据类如下：

namespace CombomBox{    public class Class1    {        public string name { get ;set;}        public string ID { get; set; }    }}

最后给出效果吧：

总结

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