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[英]TwoWay Binding ObservableCollection to DataGrid in WPF not working
[英]Cant get twoWay Binding from Xaml to ObservableCollection Working
我试图将gridView绑定到Windows Store应用程序中的ObservableCollection。 我的问题是我获取了数据,但该集似乎不起作用
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" });
}
}
这是我的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>
我肯定我错过了一些东西,但是我已经看了好几天的代码了,无法弄清楚它,字符串看起来像是可行的,这意味着如果我有2个文本框链接到ValveName字符串,则设置字符串并获取数据,但是似乎无法使用小数点,它们会在启动时获取数据,但是如果您在文本框中进行修改,似乎不会影响该变量
正确的XAML应该看起来像
<TextBox Text="{Binding ValveName, Mode=TwoWay}"/>
而不是
<TextBox Text="{Binding ValveName}, Mode=TwoWay"/>
编辑在一个侧面说明:
此代码不是线程安全的。 在this.PropertyChanged != null
和this.PropertyChanged
另一个线程可能会退订,并且PropertyChanged
变为null
。
public void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
始终使用事件处理程序的本地副本!
public void OnPropertyChanged(string propertyName)
{
var handler = this.PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
此线程现在安全
对于未来的读者:使用C#6.0(Visual Studio 2015),您还可以使用以下版本,该版本更短且线程安全,并且使用了新的“空传播运算符”运算符。
public void OnPropertyChanged(string propertyName)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
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