已使用的RoutedEvent名称

Question

在WPF中，我创建了3个UserControls“用户配置”、“系统配置”和“帐户配置”。所有这些用户控件都有“保存”和“取消”按钮。在单击这些按钮时，它们会引发在各自类中声明和定义的路由事件。单击“保存”按钮会引发"ConfigurationSaved“事件&在”取消“按钮上，将引发"ConfigurationCancelled”事件。

当引发这些事件时，承载用户控件的容器将负责保存配置。

所有类的路由事件定义的代码片段如下所示：

AccountConfigurationView:

public partial class AccountConfigurationView : UserControl
{
    static AccountConfigurationView()
    {
        ConfigurationSavedEvent = EventManager.RegisterRoutedEvent("ConfigurationSaved",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(AccountConfigurationView));

        ConfigurationClosedEvent = EventManager.RegisterRoutedEvent("ConfigurationClosed",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(AccountConfigurationView));
    }

    #region ROUTED_EVENTS_RELATED
    public static readonly RoutedEvent ConfigurationSavedEvent;
    public static readonly RoutedEvent ConfigurationClosedEvent;

    public event RoutedEventHandler ConfigurationSaved
    {
        add { AddHandler(ConfigurationSavedEvent, value); }
        remove { RemoveHandler(ConfigurationSavedEvent, value); }
    }

    public event RoutedEventHandler ConfigurationClosed
    {
        add { AddHandler(ConfigurationClosedEvent, value); }
        remove { RemoveHandler(ConfigurationClosedEvent, value); }
    }
    #endregion
}

SystemConfigurationView:

public partial class SystemConfigurationView : UserControl
{
    static SystemConfigurationView()
    {
        ConfigurationSavedEvent = EventManager.RegisterRoutedEvent("ConfigurationSaved",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(SystemConfigurationView));

        ConfigurationClosedEvent = EventManager.RegisterRoutedEvent("ConfigurationClosed",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(SystemConfigurationView));
    }

    #region ROUTED_EVENTS_RELATED
    public static readonly RoutedEvent ConfigurationSavedEvent;
    public static readonly RoutedEvent ConfigurationClosedEvent;

    public event RoutedEventHandler ConfigurationSaved
    {
        add { AddHandler(ConfigurationSavedEvent, value); }
        remove { RemoveHandler(ConfigurationSavedEvent, value); }
    }

    public event RoutedEventHandler ConfigurationClosed
    {
        add { AddHandler(ConfigurationClosedEvent, value); }
        remove { RemoveHandler(ConfigurationClosedEvent, value); }
    }
    #endregion
}

UserConfigurationView:

public partial class UserConfigurationView : UserControl
{
    static UserConfigurationView()
    {
        ConfigurationSavedEvent = EventManager.RegisterRoutedEvent("ConfigurationSaved",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(UserConfigurationView));

        ConfigurationClosedEvent = EventManager.RegisterRoutedEvent("ConfigurationClosed",
        RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(UserConfigurationView));
    }

    #region ROUTED_EVENTS_RELATED
    public static readonly RoutedEvent ConfigurationSavedEvent;
    public static readonly RoutedEvent ConfigurationClosedEvent;

    public event RoutedEventHandler ConfigurationSaved
    {
        add { AddHandler(ConfigurationSavedEvent, value); }
        remove { RemoveHandler(ConfigurationSavedEvent, value); }
    }

    public event RoutedEventHandler ConfigurationClosed
    {
        add { AddHandler(ConfigurationClosedEvent, value); }
        remove { RemoveHandler(ConfigurationClosedEvent, value); }
    }
    #endregion
}

当我使用这些类时，我得到的消息是: TypeInitializationException：

用于'baskcode.Admin.Controls.AccountConfigurationView‘的

RoutedEvent名称“ConfigurationSaved”已经使用过。

如果我试图加载任何其他控件，也会引发相同的异常。我无法纠正这个问题。请在这方面帮助我。

我使用的是.Net版本4

谢谢。

Answer 1

我假设您正在多次初始化您的控件。不能多次注册相同的路由事件名。

试试这个(对于一个RoutedEvent)：

RoutedEvent[] x = EventManager.GetRoutedEventsForOwner(typeof(UserConfigurationView));

if(x == null) {
    ConfigurationSavedEvent = EventManager.RegisterRoutedEvent(
        "ConfigurationSaved",
        RoutingStrategy.Bubble,
        typeof(RoutedEventHandler),
        typeof(UserConfigurationView)
    );
}

这个(用于多个实例化)：在您的例子中

using System.Linq;

...

RoutedEvent[] x = EventManager.GetRoutedEvents();

if(!x.Contains(ConfigurationSaved)) {
    ConfigurationSavedEvent = EventManager.RegisterRoutedEvent(
        "ConfigurationSaved",
        RoutingStrategy.Bubble,
        typeof(RoutedEventHandler), 
        typeof(UserConfigurationView)
    );
}

Answer 2

检查您的EventManager.RegisterRoutedEvent参数。如果您从另一个文件复制和粘贴了它，那么很容易忘记更改所有者类型。例如：

public class UserControlA
{
  public static readonly RoutedEvent ClickEvent =
    EventManager.RegisterRoutedEvent(
      "Click",
      RoutingStrategy.Bubble,
      typeof(RoutedEventHandler),
      typeof(UserControlA));
}

但是你把它复制粘贴到另一个文件上。注意下面错误的typeof(UserControlA)，应该是typeof(UserControlB).

public class UserControlB
{
  public static readonly RoutedEvent ClickEvent =
    EventManager.RegisterRoutedEvent(
      "Click",
      RoutingStrategy.Bubble,
      typeof(RoutedEventHandler),
      typeof(UserControlA));
}