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[英]TwoWay Binding ObservableCollection to DataGrid in WPF not working
[英]Cant get twoWay Binding from Xaml to ObservableCollection Working
我試圖將gridView綁定到Windows Store應用程序中的ObservableCollection。 我的問題是我獲取了數據,但該集似乎不起作用
public class ValveData : INotifyPropertyChanged
{
private string valveName;
private decimal waterMl;
private decimal waterEc;
private decimal waterPh;
public string ValveName
{
get { return this.valveName; }
set
{
this.valveName = value;
this.OnPropertyChanged("ValveName");
}
}
public decimal WaterMl
{
get { return this.waterMl; }
set
{
this.waterMl = value;
this.OnPropertyChanged("WaterMl");
}
}
public decimal WaterEc
{
get { return this.waterEc; }
set
{
this.waterEc = value;
this.OnPropertyChanged("WaterEc");
}
}
public decimal WaterPh
{
get { return this.waterPh; }
set
{
this.waterPh = value;
this.OnPropertyChanged("WaterPh");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
public class ValveDataCollection : ObservableCollection<ValveData>
{
public ValveDataCollection() : base()
{
Add(new ValveData { ValveName = "Valve 1", WaterMl = 100, WaterEc = 3, WaterPh = 5 });
Add(new ValveData { ValveName = "Valve 2" });
Add(new ValveData { ValveName = "Valve 3" });
Add(new ValveData { ValveName = "Valve 4" });
}
}
這是我的Xaml
<data:ValveDataCollection x:Key="ValvesData"/>
<GridView x:Name="gw1" Grid.Row="2" ItemsSource="{StaticResource ValvesData}">
<GridView.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBox Text="{Binding ValveName, Mode=TwoWay}"/>
<TextBox Text="{Binding WaterMl, Mode=TwoWay}"/>
<TextBox Text="{Binding WaterEc, Mode=TwoWay}"/>
<TextBox Text="{Binding WaterPh, Mode=TwoWay}"/>
</StackPanel>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
我肯定我錯過了一些東西,但是我已經看了好幾天的代碼了,無法弄清楚它,字符串看起來像是可行的,這意味着如果我有2個文本框鏈接到ValveName字符串,則設置字符串並獲取數據,但是似乎無法使用小數點,它們會在啟動時獲取數據,但是如果您在文本框中進行修改,似乎不會影響該變量
正確的XAML應該看起來像
<TextBox Text="{Binding ValveName, Mode=TwoWay}"/>
而不是
<TextBox Text="{Binding ValveName}, Mode=TwoWay"/>
編輯在一個側面說明:
此代碼不是線程安全的。 在this.PropertyChanged != null
和this.PropertyChanged
另一個線程可能會退訂,並且PropertyChanged
變為null
。
public void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
始終使用事件處理程序的本地副本!
public void OnPropertyChanged(string propertyName)
{
var handler = this.PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
此線程現在安全
對於未來的讀者:使用C#6.0(Visual Studio 2015),您還可以使用以下版本,該版本更短且線程安全,並且使用了新的“空傳播運算符”運算符。
public void OnPropertyChanged(string propertyName)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
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