WPF：如何在序列化的事件处理程序中获取调用对象的名称或其他唯一标识符？(WPF: How to get name or other unique identifier of calling object in event handler for serialization?)

 我有一个GridView，并希望序列化会话中的列宽 。 我对如何实现这一点的想法是将行为附加到GridViewColumns，使得每次更改列的宽度时调用附加的事件处理程序并存储新的宽度。 这已经很好。 
 
 唯一剩下的问题是： 
 
 我如何知道事件处理程序哪个GridViewColumn发送了事件 ？ 我显然需要知道，为了能够存储宽度，并稍后在恢复时在正确的列上设置宽度。 理想情况下，我想使用XAML中指定的名称作为列标识符。 
 
 这是我的代码。 XAML ： 
 
<GridView>
  <GridViewColumn x:Name="GridColumn0"
    HeaderTemplate="{StaticResource GridViewHeaderTemplate}" HeaderContainerStyle="{StaticResource GridViewHeaderStyle}" 
    Header="{x:Static strings:Strings.MainWindow_AppLog_Header_Severity}"
    behaviors:GridViewBehaviors.PersistColumnWidth="True">
 
 C＃ （请向下滚动 - 底部的问题）： 
 
// Register the property used in XAML
public static readonly DependencyProperty PersistColumnWidthProperty =
     DependencyProperty.RegisterAttached("PersistColumnWidth", typeof(bool), typeof(GridViewBehaviors),
     new FrameworkPropertyMetadata(false, new PropertyChangedCallback(OnPersistColumnWidthChanged)));

// Provide read access to the value
public static bool GetPersistColumnWidth(DependencyObject d)
{
    return (bool)d.GetValue(PersistColumnWidthProperty);
}

// Provide write access to the value (set from XAML)
public static void SetPersistColumnWidth(DependencyObject d, bool value)
{
    d.SetValue(PersistColumnWidthProperty, value);
}

// This gets called once when the XAML is compiled to BAML
// Set the event handler
private static void OnPersistColumnWidthChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
    GridViewColumn column = sender as GridViewColumn;
    if (column == null)
        return;

    // Couple the UI event with a delegate
    if ((bool)args.NewValue)
        ((INotifyPropertyChanged)column).PropertyChanged += new PropertyChangedEventHandler(PersistWidth);
    else
        ((INotifyPropertyChanged)column).PropertyChanged -= new PropertyChangedEventHandler(PersistWidth);
}

// Deal with the events
static void PersistWidth(object sender, PropertyChangedEventArgs e)
{
    GridViewColumn column = sender as GridViewColumn;
    if (column == null)
        return;

    // We are only interested in changes of the "ActualWidth" property
    if (e.PropertyName != "ActualWidth")
        return;

    // Ignore NaNs
    if (column.ActualWidth == double.NaN)
        return;

    // Persist the width here
    // PROBLEM:
    // How to get a unique identifier for column, ideally its name set in XAML?
}

I have a GridView and want to serialize column widths across sessions. My idea of how to accomplish this is to attach a behavior to the GridViewColumns in such a way that each time the width of a column is changed the attached event handler is called and stores the new width. This already works well.
 
The only remaining problem:
 
How do I know in the event handler which GridViewColumn sent the event? I obviously need to know that in order to be able to store the width and later set the width on the correct column when restoring. Ideally I would like to use the name specified in XAML as column identifier.
 
Here is my code. XAML:
 
<GridView>
  <GridViewColumn x:Name="GridColumn0"
    HeaderTemplate="{StaticResource GridViewHeaderTemplate}" HeaderContainerStyle="{StaticResource GridViewHeaderStyle}" 
    Header="{x:Static strings:Strings.MainWindow_AppLog_Header_Severity}"
    behaviors:GridViewBehaviors.PersistColumnWidth="True">
 
C# (please scroll down - question at bottom):
 
// Register the property used in XAML
public static readonly DependencyProperty PersistColumnWidthProperty =
     DependencyProperty.RegisterAttached("PersistColumnWidth", typeof(bool), typeof(GridViewBehaviors),
     new FrameworkPropertyMetadata(false, new PropertyChangedCallback(OnPersistColumnWidthChanged)));

// Provide read access to the value
public static bool GetPersistColumnWidth(DependencyObject d)
{
    return (bool)d.GetValue(PersistColumnWidthProperty);
}

// Provide write access to the value (set from XAML)
public static void SetPersistColumnWidth(DependencyObject d, bool value)
{
    d.SetValue(PersistColumnWidthProperty, value);
}

// This gets called once when the XAML is compiled to BAML
// Set the event handler
private static void OnPersistColumnWidthChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
    GridViewColumn column = sender as GridViewColumn;
    if (column == null)
        return;

    // Couple the UI event with a delegate
    if ((bool)args.NewValue)
        ((INotifyPropertyChanged)column).PropertyChanged += new PropertyChangedEventHandler(PersistWidth);
    else
        ((INotifyPropertyChanged)column).PropertyChanged -= new PropertyChangedEventHandler(PersistWidth);
}

// Deal with the events
static void PersistWidth(object sender, PropertyChangedEventArgs e)
{
    GridViewColumn column = sender as GridViewColumn;
    if (column == null)
        return;

    // We are only interested in changes of the "ActualWidth" property
    if (e.PropertyName != "ActualWidth")
        return;

    // Ignore NaNs
    if (column.ActualWidth == double.NaN)
        return;

    // Persist the width here
    // PROBLEM:
    // How to get a unique identifier for column, ideally its name set in XAML?
}

原文：https://stackoverflow.com/questions/4619467