我有一个Line Series Chart的用户控件，并为图表上的项创建了一堆依赖属性;标题，x轴标签，数据本身等......数据是KeyValuePair的可观察集合。当它在主窗口中时，我的图表工作正常。我必须在主窗口上有5个系列图表，所以我认为用户控件是一个很好的解决方案。我将xaml复制并粘贴到新的用户控件中。我添加了绑定到我想要绑定的所有元素;标题，标签，间隔和数据。然后我在后面的代码中为所有这个绑定创建了属性，并使用DependencyProperty.Register来确保它们将被传递。标题和标签工作得很好，虽然我在主窗口的xaml中硬编码。可观察的集合根本没有约束力。我尝试了在这个网站上找到的一堆解决方案（即 - 将ElementName = NameOfUserControl添加到绑定，在主窗口的绑定上添加RelativeSource = UserControl）。我似乎无法通过这些数据。
如果我没有在主窗口中添加RelativeSource子句，我会收到此错误：
System.Windows.Data错误：40：BindingExpression路径错误：'处置'属性不是＆gt;找到'object'''LineGraph'（Name ='Me'）'。 BindingExpression：路径= Disposition.WidthData; ＆GT; DataItem ='LineGraph'（Name ='Me'）; target元素是'LineGraph'（Name ='Me'）;目标＆gt; property是'ActualData'（类型'ObservableCollection`1'）
之前我遇到过这个问题，我最终放弃了，只是将xaml直接放入我的主窗口，而不是使用用户控件。我想弄清楚这一点，以便我可以使用更多的用户控件，而不是在我的主窗口中有1000行的xaml。
这是用户控件xaml：
<UserControl x:Class="Essar.Dispo.UI.UserControls.LineGraph"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:toolkit="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
xmlns:datavis="clr-namespace:System.Windows.Controls.DataVisualization;assembly=System.Windows.Controls.DataVisualization.Toolkit"
mc:Ignorable="d" x:Name="Me"
>
<UserControl.Resources>
<Style TargetType="datavis:Title" x:Key="GraphTitleStyle">
<Setter Property="Foreground" Value="Black" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="FontSize" Value="16" />
<Setter Property="FontWeight" Value="Bold" />
</Style>
<Style TargetType="datavis:Title" x:Key="AxisTitleStyle" BasedOn="{StaticResource GraphTitleStyle}">
<Setter Property="FontSize" Value="12" />
<Setter Property="FontWeight" Value="Medium" />
</Style>
<Style TargetType="datavis:Legend" x:Key="LegendStyle">
<Setter Property="Width" Value="0" />
</Style>
<Style TargetType="toolkit:AxisLabel" x:Key="AxisLabelStyle">
<Setter Property="Foreground" Value="Black" />
</Style>
</UserControl.Resources>
<Grid>
<toolkit:Chart Name="FinishingMillWidthChart" Title="{Binding MainTitle}" Height="350"
TitleStyle="{StaticResource GraphTitleStyle}"
LegendStyle="{StaticResource LegendStyle}">
<toolkit:Chart.Axes>
<toolkit:LinearAxis Orientation="X" Title="{Binding XAxisTitle}" Interval="{Binding XAxisInterval}" ShowGridLines="True"
AxisLabelStyle="{StaticResource AxisLabelStyle}" TitleStyle="{StaticResource AxisTitleStyle}" />
<toolkit:LinearAxis Orientation="Y" Title="{Binding YAxisTitle}" ShowGridLines="True" Interval="{Binding YAxisInterval}"
AxisLabelStyle="{StaticResource AxisLabelStyle}" TitleStyle="{StaticResource AxisTitleStyle}" />
</toolkit:Chart.Axes>
<toolkit:LineSeries Title="tolerance high" DependentValuePath="Value" IndependentValuePath="Key"
ItemsSource="{Binding ToleranceHigh, ElementName=Me}" Visibility="{Binding HighLowVisible}">
<toolkit:LineSeries.DataPointStyle>
<Style TargetType="{x:Type toolkit:DataPoint}">
<Setter Property="Template" Value="{x:Null}" />
<Setter Property="Background" Value="YellowGreen" />
</Style>
</toolkit:LineSeries.DataPointStyle>
</toolkit:LineSeries>
<toolkit:LineSeries Title="actual" DependentValuePath="Value" IndependentValuePath="Key"
ItemsSource="{Binding ActualData, ElementName=Me}">
<toolkit:LineSeries.DataPointStyle>
<Style TargetType="{x:Type toolkit:DataPoint}">
<Setter Property="Template" Value="{x:Null}" />
<Setter Property="Background" Value="Maroon" />
</Style>
</toolkit:LineSeries.DataPointStyle>
</toolkit:LineSeries>
<toolkit:LineSeries Title="tolerance low" DependentValuePath="Value" IndependentValuePath="Key"
ItemsSource="{Binding ToleranceLow, ElementName=Me}" Visibility="{Binding HighLowVisible}">
<toolkit:LineSeries.DataPointStyle>
<Style TargetType="{x:Type toolkit:DataPoint}">
<Setter Property="Template" Value="{x:Null}" />
<Setter Property="Background" Value="DarkCyan" />
</Style>
</toolkit:LineSeries.DataPointStyle>
</toolkit:LineSeries>
</toolkit:Chart>
</Grid>
以下是用户控件背后的代码：
public partial class LineGraph : UserControl
{
public LineGraph()
{
InitializeComponent();
DataContext = this;
}
#region Properties
public static readonly DependencyProperty MainTitleProperty = DependencyProperty.Register("MainTitle", typeof(string), typeof(LineGraph));
public string MainTitle
{
get { return GetValue(MainTitleProperty).ToString(); }
set { SetValue(MainTitleProperty, value); }
}
public static readonly DependencyProperty XAxisTitleProperty = DependencyProperty.Register("XAxisTitle", typeof(string), typeof(LineGraph));
public string XAxisTitle
{
get { return GetValue(XAxisTitleProperty).ToString(); }
set { SetValue(XAxisTitleProperty, value); }
}
public static readonly DependencyProperty YAxisTitleProperty = DependencyProperty.Register("YAxisTitle", typeof(string), typeof(LineGraph));
public string YAxisTitle
{
get { return GetValue(YAxisTitleProperty).ToString(); }
set { SetValue(YAxisTitleProperty, value); }
}
public static readonly DependencyProperty XAxisIntervalProperty = DependencyProperty.Register("XAxisInterval", typeof(double), typeof(LineGraph));
public double XAxisInterval
{
get { return Common.DoubleParse(GetValue(XAxisIntervalProperty)); }
set { SetValue(XAxisIntervalProperty, value); }
}
public static readonly DependencyProperty YAxisIntervalProperty = DependencyProperty.Register("YAxisInterval", typeof(double), typeof(LineGraph));
public double YAxisInterval
{
get { return Common.DoubleParse(GetValue(YAxisIntervalProperty)); }
set { SetValue(YAxisIntervalProperty, value); }
}
public static readonly DependencyProperty ToleranceHighProperty = DependencyProperty.Register("ToleranceHigh", typeof(ObservableCollection<KeyValuePair<double, double>>), typeof(LineGraph));
public ObservableCollection<KeyValuePair<double, double>> ToleranceHigh
{
get
{
return GetValue(ToleranceHighProperty) as ObservableCollection<KeyValuePair<double, double>>;
}
set { SetValue(ToleranceHighProperty, value); }
}
public static readonly DependencyProperty ActualDataProperty = DependencyProperty.Register("ActualData", typeof(ObservableCollection<KeyValuePair<double, double>>), typeof(LineGraph));
public ObservableCollection<KeyValuePair<double, double>> ActualData
{
get
{
return GetValue(ActualDataProperty) as ObservableCollection<KeyValuePair<double, double>>;
}
set { SetValue(ActualDataProperty, value); }
}
public static readonly DependencyProperty ToleranceLowProperty = DependencyProperty.Register("ToleranceLow", typeof(ObservableCollection<KeyValuePair<double, double>>), typeof(LineGraph));
public ObservableCollection<KeyValuePair<double, double>> ToleranceLow
{
get
{
return GetValue(ToleranceLowProperty) as ObservableCollection<KeyValuePair<double, double>>;
}
set { SetValue(ToleranceLowProperty, value); }
}
public Visibility HighLowVisible
{
get
{
if (ToleranceHigh == null || ToleranceLow == null)
return Visibility.Hidden;
return Visibility.Visible;
}
}
#endregion
}
请注意，Common.DoubleParse是我的框架中的一个函数，它执行double.TryParse，没什么特别的。
最后这是我主窗口中的xaml，不确定这是否重要，但图表位于tabitem，scrollviewer和dockpanel内。
<uc:LineGraph MainTitle="finishing mill width" Margin="5"
XAxisTitle="length (meters)" XAxisInterval="10"
YAxisTitle="millimeters" YAxisInterval="15"
ToleranceHigh="{Binding Disposition.WidthToleranceHigh}"
ActualData="{Binding Disposition.WidthData}"
ToleranceLow="{Binding Disposition.WidthToleranceLow}"/>
另外一点，我的MainWindowViewModel有一个名为Disposition的属性，它是另一个具有自己属性的视图模型。请记住，当图表位于这个完全相同的位置但完整写出时，它可以完美地工作。我想我在主窗口或用户控件中缺少一些愚蠢的东西。
感谢任何帮助： - ）
答案 0 :(得分：0)
永远不要将usercontrol的datacontext设置为此！所以只需删除您的线路。
public LineGraph()
{
InitializeComponent();
}
现在当然你应该为你的所有绑定添加你的元素名称，例如
<toolkit:LinearAxis Orientation="X"
Title="{Binding XAxisTitle, ElementName=Me}"
Interval="{Binding XAxisInterval, ElementName=Me}"
ShowGridLines="True" AxisLabelStyle="{StaticResource AxisLabelStyle}" TitleStyle="{StaticResource AxisTitleStyle}" />
<UserControl x:Class="Essar.Dispo.UI.UserControls.LineGraph"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:toolkit="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
xmlns:datavis="clr-namespace:System.Windows.Controls.DataVisualization;assembly=System.Windows.Controls.DataVisualization.Toolkit"
mc:Ignorable="d" x:Name="Me"
>
<Grid>
<ItemsControl ItemsSource="{Binding Path=ActualData, ElementName=Me}"/>
</Grid>
并在主视图中添加以下内容
<uc:LineGraph MainTitle="finishing mill width" Margin="5"
XAxisTitle="length (meters)" XAxisInterval="10"
YAxisTitle="millimeters" YAxisInterval="15"
ToleranceHigh="{Binding Disposition.WidthToleranceHigh}"
ActualData="{Binding Disposition.WidthData}"
ToleranceLow="{Binding Disposition.WidthToleranceLow}"/>
<ItemsControl ItemsSource="{Binding Disposition.WidthData}"/>
两个itemscontrols都应该显示相同的内容。
然后您可以在运行时使用SNOOP
检查绑定