将ComboBox SelectedValue绑定到字符串会禁用默认的SelectedValue wpf(Binding ComboBox SelectedValue to string disables the default SelectedValue wpf)
我正在尝试将ComboBox SelectedValue绑定到string 。 Binding工作完美无瑕。 但是，我ComboBoxItem's IsSelected一个ComboBoxItem's IsSelected设置为True ，但由于某些原因，当我启动应用程序时，没有选择任何项目， SelectedValue为空，我需要重新选择我想要的项目。
这是我的代码：
XAML：
<ComboBox x:Name="SearchOptions" FontFamily="Times New Roman" Foreground="DarkRed" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Grid.Column="2" Margin="10,0,0,0" Height="20" SelectedValue="{Binding SearchType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"> <ComboBoxItem x:Name="Contact" Content="A" FontFamily="Times New Roman" Foreground="DarkRed" HorizontalContentAlignment="Center" IsSelected="True"/> <ComboBoxItem x:Name="Paper" Content="B" FontFamily="Times New Roman" Foreground="DarkRed" HorizontalContentAlignment="Center"/> </ComboBox>ViewModel Code-Behind：
private string m_serachType; public string SearchType { get { return m_serachType; } set { m_serachType = value; OnPropertyChanged("SearchType"); } }我的ViewModel类实现了INotifyPropertyChanged 。
有任何想法吗？
I'm trying to bind a ComboBox SelectedValue to a string. The Binding works flawlessly. However, one of my ComboBoxItem's IsSelected is set to True, but for some reason when I launch the application, none of the items is selected, the SelectedValue is blank and I need to re-select the item I want.
Here's my code:
XAML:
<ComboBox x:Name="SearchOptions" FontFamily="Times New Roman" Foreground="DarkRed" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" Grid.Column="2" Margin="10,0,0,0" Height="20" SelectedValue="{Binding SearchType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"> <ComboBoxItem x:Name="Contact" Content="A" FontFamily="Times New Roman" Foreground="DarkRed" HorizontalContentAlignment="Center" IsSelected="True"/> <ComboBoxItem x:Name="Paper" Content="B" FontFamily="Times New Roman" Foreground="DarkRed" HorizontalContentAlignment="Center"/> </ComboBox>ViewModel Code-Behind:
private string m_serachType; public string SearchType { get { return m_serachType; } set { m_serachType = value; OnPropertyChanged("SearchType"); } }My ViewModel class implements INotifyPropertyChanged.
Any ideas?
最满意答案
尝试使用ComboboxItem string ：
主窗口（XAML）
<Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" xmlns:sys="clr-namespace:System;assembly=mscorlib"> <Grid> <ComboBox SelectedItem="{Binding SearchType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" > <sys:String>A</sys:String> <sys:String>B</sys:String> </ComboBox> </Grid> </Window>MainWindow（cs）
public MainWindow() { InitializeComponent(); this.DataContext = new MyViewModel() { SearchType = "A" }; }MyViewModel
class MyViewModel : INotifyPropertyChanged { private string m_serachType; public string SearchType { get { return m_serachType; } set { m_serachType = value; OnPropertyChanged("SearchType"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } }Try using string insted of ComboboxItem:
MainWindow(XAML)
<Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" xmlns:sys="clr-namespace:System;assembly=mscorlib"> <Grid> <ComboBox SelectedItem="{Binding SearchType, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" > <sys:String>A</sys:String> <sys:String>B</sys:String> </ComboBox> </Grid> </Window>MainWindow (cs)
public MainWindow() { InitializeComponent(); this.DataContext = new MyViewModel() { SearchType = "A" }; }MyViewModel
class MyViewModel : INotifyPropertyChanged { private string m_serachType; public string SearchType { get { return m_serachType; } set { m_serachType = value; OnPropertyChanged("SearchType"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } }更多推荐
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