RoutedEvent 名称已使用

Question

在 WPF 中，我创建了 3 个用户控件“用户配置”、“系统配置”和“用户配置”。 “帐户配置”。所有这些用户控件都有“保存”和“保存”功能。 “取消”按钮。单击这些按钮后，它们会引发在各自的类中声明和定义的路由事件。单击“保存”按钮后，将引发“ConfigurationSaved”事件在“取消”按钮上引发“ConfigurationCancelled”事件。

引发这些事件时，托管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：

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，我收到 TypeInitializationException 消息：

已使用 OwnerType“baskcode.Admin.Controls.AccountConfigurationView”的 RoutedEvent 名称“ConfigurationSaved”。

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

我正在使用 .Net 版本 4

谢谢。

Answer 1

检查您的 EventManager.RegisterRoulatedEvent 参数。如果您从另一个文件复制并粘贴它，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));
}

但是然后您将其复制粘贴到另一个文件中。请注意下面错误的 typeof(UserControlA)，它应该是 typeof(UserControlB)。

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

Answer 2

我假设您多次初始化控件。您不能多次注册相同的路由事件名称。

试试这个（对于一个RoatedEvent）：

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

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

这个（对于多个实例）：在你的情况下

using System.Linq;

...

RoutedEvent[] x = EventManager.GetRoutedEvents();

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