嘿，
我正在使用 MVVM 创建简单的应用程序，并偶然发现了一个我发现难以解决的问题。在我的应用程序中，我有数据网格和几个控件来编辑数据网格中当前选定的项目。在我的 ViewModel 中，我有CurrentSequence持有ColorSettingsSequencesSequence对象的属性（这些对象的集合用作数据网格的 DataContext）。
这是xml：
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Path=ColorSettingsSequences}"
SelectedItem="{Binding Path=CurrentSequence, Mode=TwoWay}">
.... more things here ...
</DataGrid>
<StackPanel Grid.Column="0" Grid.Row="0">
<Grid>
<Label Content="Start temperature (°C)" Height="28" HorizontalAlignment="Left" x:Name="lblSeqStartTemp" VerticalAlignment="Top" />
<TextBox Height="23" Margin="0,28,10,0" x:Name="tbSeqStartTemp" VerticalAlignment="Top" Text="{Binding Path=CurrentSequence.StartTemp}" />
</Grid>
<Grid>
<Label Content="Start color" Height="28" HorizontalAlignment="Left" x:Name="lblSeqHue" VerticalAlignment="Top" />
<xctk:ColorPicker Margin="0,28,10,0" x:Name="clrpSeqHue" SelectedColor="{Binding Path=CurrentSequence.StartHue, Converter={StaticResource hueToColor}, ConverterParameter=False}" ShowStandardColors="False" />
</Grid>
</StackPanel>
<StackPanel Grid.Column="1" Grid.Row="0">
<Grid>
<Label Content="End temperature (°C)" Height="28" HorizontalAlignment="Left" x:Name="lblSeqEndTemp" VerticalAlignment="Top" />
<TextBox Height="23" Margin="0,28,10,0" x:Name="tbSeqEndTemp" VerticalAlignment="Top" Text="{Binding Path=CurrentSequence.EndTemp}" />
</Grid>
<Grid>
<Label Content="End color" Height="28" HorizontalAlignment="Left" x:Name="lblSeqEndHue" VerticalAlignment="Top" />
<xctk:ColorPicker Margin="0,28,10,0" x:Name="clrpSeqEndHue" SelectedColor="{Binding Path=CurrentSequence.EndHue, Converter={StaticResource hueToColor}, ConverterParameter=False}" ShowStandardColors="False" />
</Grid>
</StackPanel>
代码：
private ColorSettingsSequencesSequence _currentSequence;
public ColorSettingsSequencesSequence CurrentSequence
{
get
{
return this._currentSequence;
}
set
{
this._currentSequence = value;
OnPropertyChanged("CurrentSequence");
}
}
这很好用，但是当我想添加验证时问题就来了。我想分别验证StartTemp并EndTemp给出不同的错误。如果我编辑一个值，它也会在数据网格中更新，我将如何分解ColorSettingsSequencesSequence对象以便绑定也能正常工作？
这是我尝试过的，我创建了 2 个新属性并将我的验证添加到这些属性中：
private String _currentSequenceStartTemp;
public String CurrentSequenceStartTemp
{
get
{
return _currentSequenceStartTemp;
}
set
{
this._currentSequenceStartTemp = value;
CurrentSequence.StartTemp = value;
RaisePropertyChanged("CurrentSequenceStartTemp");
Validator.Validate(() => CurrentSequenceStartTemp);
ValidateCommand.Execute(null);
}
}
private String _currentSequenceEndTemp;
public String CurrentSequenceEndTemp
{
get
{
return _currentSequenceEndTemp;
}
set
{
this._currentSequenceEndTemp = value;
CurrentSequence.EndTemp = value;
RaisePropertyChanged("CurrentSequenceEndTemp");
Validator.Validate(() => CurrentSequenceEndTemp);
ValidateCommand.Execute(null);
}
}
我只是将 TextBoxes 绑定到这些值，而不是将它们直接绑定到CurrentSequence. 我还添加了在设置器中设置 CurrentSequence 值，并希望这样我的更改将一直推回原始集合并在数据网格中进行更改。那没有发生..当 CurrentSequence 改变时，我也改变了这些属性的值：
private ColorSettingsSequencesSequence _currentSequence;
public ColorSettingsSequencesSequence CurrentSequence
{
get
{
return this._currentSequence;
}
set
{
this._currentSequence = value;
RaisePropertyChanged("CurrentSequence");
if (value != null)
{
CurrentSequenceStartTemp = value.StartTemp;
CurrentSequenceEndTemp = value.EndTemp;
}
else
{
CurrentSequenceStartTemp = String.Empty;
CurrentSequenceEndTemp = String.Empty;
}
}
}
