自定义事件转换vb.net到c#

Question

我在将自定义事件从vb.net转换为c#时遇到了一些问题，我真的没有vb.net的经验，而且我对这些自定义事件的经验更少，应用程序的其余部分转换没有太大问题，但是这一个让我卡住了。我用过的转换器(包括付费的和免费的)都不能产生可用的代码。

VB.net代码:

<NonSerialized()> Private _objNonSerializablePropertyChangedHandlers As New System.ComponentModel.EventHandlerList
'''' <summary> 
'''' Raised when a public property of this object is set. 
'''' </summary> 
Public Custom Event PropertyChanged As PropertyChangedEventHandler Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged
    AddHandler(ByVal value As PropertyChangedEventHandler)
        Me.NonSerializablePropertyChangedHandlers.AddHandler(STR_PROPERTYCHANGEDEVENT, value)
    End AddHandler
    RemoveHandler(ByVal value As PropertyChangedEventHandler)
        Me.NonSerializablePropertyChangedHandlers.RemoveHandler(STR_PROPERTYCHANGEDEVENT, value)
    End RemoveHandler
    RaiseEvent(ByVal sender As Object, ByVal e As PropertyChangedEventArgs)
        Dim obj As PropertyChangedEventHandler = TryCast(Me.NonSerializablePropertyChangedHandlers(STR_PROPERTYCHANGEDEVENT), PropertyChangedEventHandler)
        If obj IsNot Nothing Then
            obj.Invoke(sender, e)
        End If
    End RaiseEvent

我用c#编写的最好的代码如下:

c#

[NonSerialized()]
private System.ComponentModel.EventHandlerList _objNonSerializablePropertyChangedHandlers = new System.ComponentModel.EventHandlerList();
public event PropertyChangedEventHandler PropertyChanged
{
    add
    {
        this.NonSerializablePropertyChangedHandlers.AddHandler(STR_PROPERTYCHANGEDEVENT, value);
    }
    remove
    {
        this.NonSerializablePropertyChangedHandlers.RemoveHandler(STR_PROPERTYCHANGEDEVENT, value);
    }
}
protected void OnPropertyChanged(string strPropertyName)
{
    EventHandler handler = this.PropertyChanged;
    if (handler != null)
    {
        handler.Invoke(this, new PropertyChangedEventArgs(strPropertyName));
        //PropertyChanged(this, new PropertyChangedEventArgs(strPropertyName));
    }
}

然而，这会抛出一个错误"事件'CardBase。PropertyChanged'只能出现在+=或-="

的左侧

行:EventHandler handler = this.PropertyChanged;

由于我不是100%对上面的代码是做什么，我正在努力修复这个自己，我会非常感激是有人可以帮助这。

Answer 1

更改此代码

protected void OnPropertyChanged(string strPropertyName)
{
    EventHandler handler = this.PropertyChanged;
    if (handler != null)
    {
        handler.Invoke(this, new PropertyChangedEventArgs(strPropertyName));
    }
}

protected void OnPropertyChanged(string strPropertyName)
{
    var handler =
       this.NonSerializablePropertyChangedHandlers[STR_PROPERTYCHANGEDEVENT]
           as EventHandler;
    if (handler != null)
    {
        handler(this, new PropertyChangedEventArgs(strPropertyName));
    }
}

reference -event-只能出现在+=或-=的左侧