[英]Binding TextBox.Text to a Property in a class in ObservableCollection
I have two TextBox
es. 我有两个
TextBox
。 I have two ObservableCollection
s. 我有两个
ObservableCollection
。 The ObservableCollection
has items of the following type: ObservableCollection
具有以下类型的项:
public class ChartData : INotifyPropertyChanged
{
DateTime _Name;
double _Value;
#region properties
public DateTime Name
{
get
{
return _Name;
}
set
{
_Name = value;
OnPropertyChanged("Name");
}
}
public double Value
{
get
{
return _Value;
}
set
{
_Value = value;
OnPropertyChanged("Value");
}
}
#endregion
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
I need to bind each of the TextBox.Text
to the Value Property in each of the ObservableCollection
s. 我需要将每个
TextBox.Text
绑定到每个ObservableCollection
的Value属性。 The ObservableCollection
s are DataContext
for other controls in the window too. ObservableCollection
也是窗口中其他控件的DataContext
。 Since I have more than one ObservableCollection
, I cannot set the DataContext
to the Window. 由于我有多个
ObservableCollection
,因此无法将DataContext
设置为Window。
New data is added to the ObservableCollection
using: 使用以下命令将新数据添加到
ObservableCollection
中:
ObservableCollection<ChartData>lineSeries1Data = new ObservableCollection<ChartData>();
lineSeries1Data.Add(new ChartData() { Name = DateTime.Now, Value = 0.0 });
When a new Value is added to the Collection, I want the TextBox
to show the Value property 当将新值添加到集合时,我希望
TextBox
显示Value属性
You can try something like this if you don't need a "real" binding, but just need to display the Value of the last object which is added (pseudo code): 如果您不需要“真实”绑定,而只需显示最后添加的对象的值(伪代码),则可以尝试这样的操作:
public string NewItem { get; set+notify; }
ctor(){
myCollection = new ObservableCollection<T>();
myCollection.CollectionChanged += OnMyCollectionChanged;
}
private void OnMyCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
{
if (args.Action == NotifyCollectionChangedAction.Add){
var last = args.NewItems.FirstOrDefault();
if (last == null) return;
NewItem = last.Value;
}
}
//XAML:
<TextBox Text="{Binding NewItem, Mode=OneWay}" />
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