绑定时未实现错误的方法或操作

Question

我目前正在开发一个Visual Studio插件(VSPackage),它最终应该能够可视化调用关系.为了表示它们,我想使用管理图形的Graph#库(避免重叠边缘等).不幸的是,我在运行时在我的XAML中收到以下错误消息:

XamlParseException:未实现方法或操作.

<graph:CallRelationGraphLayout Graph="{Binding RelationGraph}"/>标签上会弹出错误.

<UserControl x:Class="Biocoder.InteractiveExploration.View.ExplorationControl"
         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:graphsharp="clr-namespace:GraphSharp.Controls;assembly=GraphSharp.Controls"
         xmlns:zoom="clr-namespace:WPFExtensions.Controls;assembly=WPFExtensions"
         xmlns:graph="clr-namespace:Biocoder.InteractiveExploration.Graph"
         xmlns:viewmodels="clr-namespace:Biocoder.InteractiveExploration.ViewModel"
         xmlns:controls="clr-namespace:Biocoder.InteractiveExploration.Controls" mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">



<UserControl.DataContext>
    <viewmodels:ExplorationToolViewModel/>
</UserControl.DataContext>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <zoom:ZoomControl Grid.Row="1"
                      Zoom="0.2"
                      ZoomBoxOpacity="0.5"
                      Background="Yellow">

        <graph:CallRelationGraphLayout Graph="{Binding RelationGraph}"/>

    </zoom:ZoomControl>

</Grid>

</UserControl>

我还创建了自己的顶点,边和图布局类.我的图最终应该表示方法(顶点)之间的调用关系(边).

MethodVertex.cs

public class MethodVertex
{
    public string ID { get; private set; }
    public bool IsMale { get; private set; }

    public MethodVertex(string id, bool isMale)
    {
        ID = id;
        IsMale = isMale;
    }

    public override string ToString()
    {
        return string.Format("{0}-{1}", ID, IsMale);
    }
}

RelationEdge.cs

public class RelationEdge : Edge<MethodVertex>
{
    public string Id { get; private set; }

    public RelationEdge(string id, MethodVertex source, MethodVertex target)
        : base(source, target)
    {
        Id = id;
    }
}

CallRelationGraphLayout.cs

public class CallRelationGraphLayout : GraphLayout<MethodVertex, RelationEdge, CallRelationGraph>
{}

CallRelationGraph.cs

public class CallRelationGraph : BidirectionalGraph<MethodVertex, RelationEdge>
{
    public CallRelationGraph()
    {}

    public CallRelationGraph(bool allowParallelEdges)
        : base(allowParallelEdges)
    { }

    public CallRelationGraph(bool allowParallelEdges, int vertexCapacity)
        : base(allowParallelEdges, vertexCapacity)
    {}
}

在ExplorationToolViewModel中,我将RelationGraph声明如下:

private CallRelationGraph _relationGraph;
public CallRelationGraph RelationGraph
{
    get { return _relationGraph; }
    set
    {
        if (value != _relationGraph)
        {
            _relationGraph = value;
            NotifyPropertyChanged("RelationGraph");
        }
    }
}

public event PropertyChangedEventHandler PropertyChanged;

public void NotifyPropertyChanged(string propertyName)
{
    if (PropertyChanged != null)
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}

我可能还应该提到的是,我有时会显示以下错误,但项目编译并运行.

GenericArguments [1],'Biocoder.InteractiveExploration.Graph.RelationEdge','GraphSharp.Algorithms.Layout.ILayoutAlgorithm`3 [TVertex,TEdge,TGraph]'违反了'TEdge'类型的约束.

也许它是问题的根源但是我到目前为止忽略它,因为它编译并且我对应于本教程.

奇怪的是它实际上在使用Graph#提供的DLL的普通WPF应用程序中工作.当我离开Graph-property时,错误没有出现,所以我猜它与Graph属性有关.关于如何解决这个问题的任何提示？

非常感谢你提前!

Answer 1

我在 VSPackage 中使用 Graph# 时遇到了同样的问题。我通过不使用图表的绑定，而是通过Graph在 CodeBehind 中分配属性来解决这个问题。

这导致了分配属性时无法加载 WPFExtensions 程序集的异常Graph。我怀疑其原因是在 GraphSharp.Controls 中，在 XAML 中使用了程序集，但在编译时未添加引用，因为代码中没有引用。我可以通过在分配属性之前添加以下行来解决此问题Graph：

var a = System.Reflection.Assembly.Load("WPFExtensions, Version=1.0.3437.34043, Culture=neutral, PublicKeyToken=null");

此行在 WPF 尝试根据 XAML 中的引用加载 WPFExtensions 库之前加载它。随后，图表被展示出来。