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POCustom Event Conversion vb.net to c#
 

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  1. POCustom Event Conversion vb.net to c#
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    <p>I'm having some issues with converting a custom event from vb.net to c#, I have no experience of vb.net really, and i have even less experience with these custom events, the rest of the application was converted without much issue, however this one has me stuck. The converters that i have used (both paid and free) have all failed to produce usable code. </p> <p>VB.net code:</p> <pre class="lang-vb prettyprint-override"><code>&lt;NonSerialized()&gt; Private _objNonSerializablePropertyChangedHandlers As New System.ComponentModel.EventHandlerList '''' &lt;summary&gt; '''' Raised when a public property of this object is set. '''' &lt;/summary&gt; 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 </code></pre> <p>the best i have managed to produce in c# is the following:</p> <p>C#</p> <pre class="lang-cs prettyprint-override"><code>[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)); } } </code></pre> <p>However this throws an error "The event 'CardBase.PropertyChanged' can only appear on the left hand side of += or -="</p> <p>on the line : EventHandler handler = this.PropertyChanged;</p> <p>As i'm not 100% on what the above code is doing, im struggling to fix this myself, I would be very grateful is someone could assist on this.</p>
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    1. USDamien_The_Unbeliever
    1. USBen
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      1. VTUpMod
    1. COThat **should** compile...
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      1. USIt'sNotALie.
    2. CONot totally related to your question, but you can prevent a race condition by using the Interlocked.CompareExchange pattern to obtain your event handler.
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      1. USGayot Fow
    3. CO@newStackExchangeInstance: Why do you say that? It certainly appears to be a valid compiler error...
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      1. USChris
 

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