问题描述

关于WPF中ComBox的问题

用下拉框做了一个按类别查找，可是取不到里面的文本。在xaml页面怎么写ComBox？？在ViewModel.cs呢？

解决方案

在XAML文件中的代码：

  <Grid x:Name=""LayoutRoot"" Background=""White"" DataContext=""{Binding Source={StaticResource cb}}"">        <StackPanel HorizontalAlignment=""Left"">            <ComboBox ItemsSource=""{Binding Info}"" Width=""150"" SelectedItem=""{Binding ComboSelectedItemMode=TwoWay}"" >                <i:Interaction.Triggers>                    <i:EventTrigger EventName=""SelectionChanged"">                        <si:CallDataMethod Method=""ComboBoxSelectionChanged""></si:CallDataMethod>                    </i:EventTrigger>                </i:Interaction.Triggers>                <ComboBox.ItemTemplate>                    <DataTemplate>                        <TextBlock Text=""{Binding Name}""                                   Tag=""{Binding Tag}"" ></TextBlock>                    </DataTemplate>                </ComboBox.ItemTemplate>            </ComboBox>            <Button Margin=""0 5 0 5"" Content=""Click"" Command=""{Binding}""></Button>            <TextBlock Margin=""0 5 0 5"" Name=""tb""></TextBlock>        </StackPanel>    </Grid>

在ViewModel中的代码：

 public class ComboBoxTemplateViewModel : ViewModelBase    {        private ObservableCollection<Student> _Info = new ObservableCollection<Student>();        private Student _ComboSelectedItem = null;        public ComboBoxTemplateViewModel()        {            _Info.Add(new Student() { Name = ""ABC1"" Tag = ""1"" });            _Info.Add(new Student() { Name = ""ABC2"" Tag = ""2"" });            _Info.Add(new Student() { Name = ""ABC3"" Tag = ""3"" });            _Info.Add(new Student() { Name = ""ABC4"" Tag = ""4"" });            _Info.Add(new Student() { Name = ""ABC5"" Tag = ""5"" });            _Info.Add(new Student() { Name = ""ABC6"" Tag = ""6"" });            _ComboSelectedItem = _Info[1];        }        public ObservableCollection<Student> Info        {            get            {                return _Info;            }        }        public Student ComboSelectedItem        {            get            {                return _ComboSelectedItem;            }            set            {                _ComboSelectedItem = value;                NotifyPropertyChanged(""ComboSelectedItem"");            }        }        public ICommand GetSelectedData        {            get            {                return new RelayCommand(GetSelectedItemAndDisplayIt);            }        }        private void GetSelectedItemAndDisplayIt()        {        }        public void ComboBoxSelectionChanged()        {            MessageBox.Show(""Item selected is : "" + ComboSelectedItem.Name);        }    }