首先,我将尝试解释我在做什么。我想画一个棋盘。我有一个用户控制研究用于细胞Silverlight:绑定复杂属性
<Grid x:Name="LayoutRoot">
<Border BorderThickness="0" Margin="0" Background="{Binding CellColor, ElementName=userControl, Mode=TwoWay}"/>
<Border x:Name="ValidMoveMarker" BorderThickness="0" Margin="0" Background="#FFC1CAB4" Opacity="0"/>
<Image x:Name="img" Source="{Binding source, ElementName=userControl, Mode=TwoWay}" Cursor="Hand"/>
在代码本CellControl的背后我有2个dpProperties
public eColor? PieceColor
{
get { return (eColor?)GetValue(PieceColorProperty); }
set { SetValue(PieceColorProperty, value);}
}
public static readonly DependencyProperty PieceColorProperty = DependencyProperty.Register("PieceColor", typeof(eColor?), typeof(CellControl), null);
public eType? PieceType
{
get { return (eType?)GetValue(PieceTypeProperty); }
set { SetValue(PieceTypeProperty, value);}
}
public static readonly DependencyProperty PieceTypeProperty = DependencyProperty.Register("PieceType", typeof(eType?), typeof(CellControl), null);
其中易彩和ETYPE是枚举器。在这里,我也有一个属性
public ImageSource source
{
get
{
if (PieceColor == eColor.White)
{
switch (PieceType)
{
case eType.Pawn:
return new BitmapImage(new Uri("/PO.PC;component/Images/chess_piece_white_pawn_T.png", UriKind.Relative));
case eType.Knight:
return new BitmapImage(new Uri("/PO.PC;component/Images/chess_piece_white_knight_T.png", UriKind.Relative));
...
default:
return null;
}
}
else
{
switch (PieceType)
{
case eType.Pawn:
}
}
}
现在的问题是,当我尝试使用控制这样
<PP_Controls:CellControl PieceType="{Binding type, Mode=TwoWay}" PieceColor="{Binding color, Mode=TwoWay}"
其中
private eColor? _color;
public eColor? color
{
get { return _color; }
set
{
_color = value;
OnPropertyChanged("color");
}
}
private eType? _type;
public eType? type
{
get { return _type; }
set
{
_type = value;
OnPropertyChanged("type");
}
}
空话发生。但如果我使用这样的控制
<PP_Controls:CellControl PieceType="Bishop" PieceColor="Black"
它是完美的工作。我在装订中错过了什么吗?这是因为“源”属性不是依赖属性本身?我该如何解决我的问题?
正是!这是一个关键点“你应该添加一个依赖属性更改处理程序PieceColor和PieceType调用OnPropertyChanged(”源“)”。 另外我缺少PieceType =“{Binding type,Mode = TwoWay}中的ElementName标签” – 2013-03-11 13:17:45