我有一个列表框，其中包含“02x06”形式的字符串列表。总是两位数字，小写字母x，两位数字，没有空格。这绑定到两个文本框，一个保存行（在本例中为02），另一个保存列（06）。
这完全没问题。
现在我需要将行文本框绑定到代码中的Row属性，将col文本框绑定到代码中的Col属性。我试图通过MultiBinding来做到这一点：
XAML：
<Windows.Resources>
<local:DiePrintConverter x:Key="DiePrintConverter"/>
</Window.Resources>
<ListBox
Name="lbxUninspectedPrints"
ItemsSource="{Binding UninspectedPrintList}"
Margin="5"
Background="MidnightBlue"/>
<TextBox
Name="txtCol"
Style="{StaticResource txtStyle}">
<TextBox.Text>
<MultiBinding Converter="{StaticResource DiePrintConverter}">
<Binding
Path="SelectedValue"
ConverterParameter="1"
ElementName="lbxUninspectedPrints"
Mode="OneWay"/>
<Binding
Path="Col"
Mode="OneWayToSource"/>
</MultiBinding>
</TextBox.Text>
</TextBox>
<TextBox
Name="txtRow"
Style="{StaticResource txtStyle}">
<TextBox.Text>
<MultiBinding Converter="{StaticResource DiePrintConverter}">
<Binding
Path="SelectedValue"
ConverterParameter="0"
ElementName="lbxUninspectedPrints"
Mode="OneWay"/>
<Binding
Path="Row"
Mode="OneWayToSource"/>
</MultiBinding>
</TextBox.Text>
</TextBox>
代码背后：
lbxUninspectedPrints.DataContext = wtw;
txtRow.DataContext = wtw.DiePrintNav;
txtCol.DataContext = wtw.DiePrintNav;
DiePrintConverter类：
public class DiePrintConverter : IMultiValueConverter
{
bool row = true;
public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
{
if (value[0] == null)
{
return "00";
}
var values = value[0].ToString().Split(new string[] { "x" }, StringSplitOptions.None);
int x = 0;
for (int i = 0; i < values.Count(); i++)
{
if (values[i].ToString().Count() == 1)
{
values[i] = "0" + values[i];
}
}
if (row)
{
row = false;
return values[0].ToString();
}
else
{
row = true;
return values[1].ToString();
}
return "00";
}
public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
DiePrintNavigation Class：
public class DiePrintNavigation
{
#region Fields
private string row;
private string col;
private DiePrint diePrint;
private DelegateCommand moveUpCommand;
private DelegateCommand moveDownCommand;
private DelegateCommand moveLeftCommand;
private DelegateCommand moveRightCommand;
private DelegateCommand loadMapCommand;
private WaferTrackerWindowViewModel wtw;
#endregion
#region Constructor
public DiePrintNavigation() { }
public DiePrintNavigation(WaferTrackerWindowViewModel wtw)
{
this.wtw = wtw;
}
#endregion
#region Properties
public string Row
{
set
{
row = value;
}
}
public string Col
{
set
{
col = value;
}
}
public DiePrint DiePrint
{
get
{
return diePrint;
}
set
{
diePrint = value;
}
}
public ICommand MoveUpCommand
{
get
{
if (moveUpCommand == null)
{
moveUpCommand = new DelegateCommand(MoveUp);
}
return moveUpCommand;
}
}
public ICommand MoveDownCommand
{
get
{
if (moveDownCommand == null)
{
moveDownCommand = new DelegateCommand(MoveDown);
}
return moveDownCommand;
}
}
public ICommand MoveLeftCommand
{
get
{
if (moveLeftCommand == null)
{
moveLeftCommand = new DelegateCommand(MoveLeft);
}
return moveLeftCommand;
}
}
public ICommand MoveRightCommand
{
get
{
if (moveRightCommand == null)
{
moveRightCommand = new DelegateCommand(MoveRight);
}
return moveRightCommand;
}
}
public ICommand LoadMapCommand
{
get
{
if (loadMapCommand == null)
{
loadMapCommand = new DelegateCommand(LoadMap);
}
return loadMapCommand;
}
}
#endregion
#region Methods
private void Move()
{
DiePrintQueries diePrintQueries = new DiePrintQueries(
DataLibrary.SingulationOne,
DataLibrary.MasksInfo);
diePrint.Name = diePrint.Row.ToString() + "x" + diePrint.Col.ToString();
try
{
diePrint.Mask = diePrintQueries.GetMask(diePrint.Name);
diePrint.LasersPerDie = diePrintQueries.GetLasersPerDie(diePrint.Mask);
diePrint.DieTable = diePrintQueries.GetListOfDie(diePrint.Name);
wtw.WaferMap.DiePrint = diePrint;
wtw.WaferMap.DrawMap();
}
catch (InvalidOperationException)
{
MessageBox.Show(
"Die Print " + diePrint.Name + " does not exist on this wafer.\n" +
"Please move to a die print that exists.",
"Non-Existent Die Print", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
public void MoveUp()
{
// TODO: Catch all these Move Errors!!!
try
{
diePrint.GetRowAndColumn(diePrint.Name);
diePrint.Row = diePrint.Row - 1;
Move();
}
catch (NullReferenceException)
{
}
}
public void MoveDown()
{
diePrint.GetRowAndColumn(diePrint.Name);
diePrint.Row = diePrint.Row + 1;
Move();
}
public void MoveRight()
{
diePrint.GetRowAndColumn(diePrint.Name);
diePrint.Col = diePrint.Col + 1;
Move();
}
public void MoveLeft()
{
diePrint.GetRowAndColumn(diePrint.Name);
diePrint.Col = diePrint.Col - 1;
Move();
}
public void LoadMap()
{
if (diePrint == null)
{
DiePrintQueries diePrintQueries = new DiePrintQueries(
DataLibrary.SingulationOne,
DataLibrary.MasksInfo);
if (this.row.StartsWith("0"))
{
row = row.Remove(0, 1);
}
if (this.col.StartsWith("0"))
{
col = col.Remove(0, 1);
}
diePrint = new DiePrint(this.row + "x" + this.col);
diePrint.Mask = diePrintQueries.GetMask(diePrint.Name);
diePrint.DieTable = diePrintQueries.GetListOfDie(diePrint.Name);
// TODO: dupCode(1)
// Then map the die print
wtw.WaferMap = new DiePrintMapViewModel(diePrint);
wtw.WaferMap.NotifyCanvas += wtw.Update;
wtw.WaferMap.NotifyBluetape += wtw.Update;
wtw.WaferMap.NotifyDieprint += wtw.Update;
wtw.WaferMap.DrawMap();
wtw.FailureCodeManager.DiePrintMap = (DiePrintMapViewModel) wtw.WaferMap;
}
diePrint.Row = Convert.ToInt32(this.row);
diePrint.Col = Convert.ToInt32(this.col);
Move();
}
#endregion
}
wtw是包含所有这些组件的窗口的视图模型。 DiePrintNav是一个包含Row和Col只写属性的类，当txtRow和txtCol值发生变化时需要更新这些属性。 wtw视图模型对象包含DiePrintNav属性，并且是文本框的数据上下文。未经检查的打印列表框的数据上下文也是wtw对象，并绑定到wtw的UninspectedPrintList属性。
列表框已正确填写。然后我可以单击列表框中的任何内容，它也会被镜像到txtRow和txtCol框中，所以IMultiValueConverter类也正常工作。
问题是，只要txtRow和txtCol框中发生任何变化，它们各自的属性就不会更新。
发生了什么事？
任何帮助将不胜感激！
谢谢，
凯尔
答案 0 :(得分：0)
也许您的班级DiePrintNav必须实施INotifyPropertyChanged界面。可以？这可能是原因。请检查一下。
修改
我现在明白了，您想要从视图更新模型属性。问题似乎是您需要定义MultiValueConverter的ConvertBack方法，这样视图将能够在更改时更新所有属性。另一件事是绑定应该是Mode=TwoWay，因为，即使您不想从模型更新视图，第一次加载模型时，您可能希望视图显示旧的模型值，在这种情况下需要双向绑定。希望此更新有助于......
修改
请查看MSDN IMultivalueConverter Interface文章，此处解释IMultivalueConverter界面的工作方式，希望有所帮助：）