[英]WPF StackPanel ToolTip Binding Failing
我的WPF XAML文件中包含以下代碼:
<DataGrid ItemsSource="{Binding CustomersViewModel}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Customer">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel DataContext="{Binding}">
<StackPanel.ToolTip>
<ToolTip DataContext="{Binding RelativeSource={RelativeSource Self},
Path=PlacementTarget.DataContext}">
<TextBlock>
<Run Text="Customer Name: "/>
<Run Text="{Binding FullName}"/>
</TextBlock>
</ToolTip>
</StackPanel.ToolTip>
<TextBlock Text="{Binding FullName}"/>
<TextBlock Text="{Binding Address}" />
<TextBlock Text="{Binding BirthDate}"/>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
public ObservableCollection<CustomerViewModel> CustomersViewModel
我添加了ToolTip DataContext屬性,現在崩潰消失了,但是它沒有綁定任何東西,FullName變為空。 StackPanel位於Datagrid內部,其定義如下:
<DataGrid ItemsSource="{Binding}" AutoGenerateColumns="False">
更新:
public partial class CustomersScreen : UserControl
{
private ObservableCollection<CustomerViewModel> _customersViewModel;
public CustomersScreen ()
{
InitializeComponent();
_customersViewModel= new ObservableCollection<CustomerViewModel>()
{
new CustomerViewModel() { FirstName = "Mary", LastName = "Kate", City="Houston", State="Texas", BirthDate = "12/19/2981"},
new CustomerViewModel() { FirstName = "John", LastName="Doe", City="Austin", State="Texas", BirthDate = "03/01/2001"}
};
this.DataContext = _customersViewModel;
}
public ObservableCollection<CustomerViewModel> CustomersViewModel
{
get { return _customersViewModel; }
}
}
您的視圖模型應為FullName
屬性實現INotifyPropertyChanged
,如下所示:
public class CustomViewModel : INotifyPropertyChanged {
public CustomViewModel(){
//....
}
protected event PropertyChangedEventHandler propertyChanged;
protected void OnPropertyChanged(string property){
var handler = propertyChanged;
if(handler != null) handler(this, new PropertyChangedEventArgs(property));
}
event INotifyPropertyChanged.PropertyChanged {
add { propertyChanged += value; }
remove { propertyChanged -= value;}
}
public string FullName {
get {
return String.Format("{0}, {1}", LastName, FirstName);
}
}
string firstName;
string lastName;
public string FirstName {
get { return firstName;}
set {
if(firstName != value){
firstName = value;
OnPropertyChanged("FirstName");
//also trigger PropertyChanged for FullName
OnPropertyChanged("FullName");
}
}
}
public string LastName {
get { return lastName;}
set {
if(lastName != value){
lastName = value;
OnPropertyChanged("LastName");
//also trigger PropertyChanged for FullName
OnPropertyChanged("FullName");
}
}
}
}
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