見下文XAML
:壓倒一切的ToString()方法,奇怪的行爲用結合
<Window x:Class="TabControl.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TabControl"
Title="MainWindow" Height="300" Width="300"
xmlns:Interact="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}"
>
<Window.Resources>
<Style TargetType="{x:Type DataGridRow}" x:Key="myStyle">
<Style.Triggers>
<DataTrigger Binding="{Binding IsTrend.Value}" Value="True" >
<Setter Property="Background" Value="Gold"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<ScrollViewer>
<DataGrid ItemsSource="{Binding list}" x:Name="myGrid" RowStyle="{StaticResource myStyle}" >
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Path=Name.Value,Mode=TwoWay}" />
</DataGrid.Columns>
</DataGrid>
</ScrollViewer>
源的DataGrid
private ObservableCollection<dynamic> GetDynamicOrders2()
{
var retVal = new ObservableCollection<dynamic>();
for (int i = 0; i < 50; i++)
{
dynamic eo = new ExpandoObject();
eo.Name = new CellContent("Order" + i);
eo.IsTrend = new CellContent(i % 2 == 0);
retVal.Add(eo);
}
return retVal;
}
類
public sealed class CellContent : INotifyPropertyChanged
{
private object _value;
public object Value
{
get { return _value; }
set
{
_value = value;
OnPropertyChanged("Value");
}
}
public CellContent(object value)
{
Value = value;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
從每個結合我override
ToString()
方法除去.Value
。
public override string ToString()
{
return Value.ToString();
}
和有約束力的改變爲:
<DataGridTextColumn Header="Name" Binding="{Binding Path=Name,Mode=TwoWay}" />
但它表現爲不同和DataTrigger
綁定Column
。有人可以解釋爲什麼和如何?爲什麼DataTrigger
在更改後無法工作?
你能解釋一下* 「從各個結合我重寫'的ToString()'方法去除'.Value'」 *?雙向綁定顯然不能將字符串值轉換回來。 – Sinatr
我能想到的唯一情況是ToString拋出異常,因爲Value爲null或Value的ToString實現拋出異常。你應該在你的輸出窗口中有信息 – nkoniishvt
不要使用'ToString'來做這樣的事情,正如已經提到的那樣,你也打破了雙向綁定。 –