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PORaise an event via reflection in c#
 

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  1. PORaise an event via reflection in c#
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    <p>I want to <strong>write a reusable function</strong> to raise an event via reflection.</p> <p>After searching, I found this similar question: <a href="https://stackoverflow.com/questions/198543/how-do-i-raise-an-event-via-reflection-in-net-c">How do I raise an event via reflection in .NET/C#?</a></p> <p>It works until I register an event handler to WinForm control and try to invoke it. The private field '<code>&lt;EventName&gt;</code>' simply disappears.</p> <p>Below is my simplified code which reproduces the problem:</p> <p>Program.cs:</p> <pre><code>public static void Main() { Control control = new Control(); control.Click += new EventHandler(control_Click); MethodInfo eventInvoker = ReflectionHelper.GetEventInvoker(control, "Click"); eventInvoker.Invoke(control, new object[] {null, null}); } static void control_Click(object sender, EventArgs e) { Console.WriteLine("Clicked !!!!!!!!!!!"); } </code></pre> <p>Here is my ReflectionHelper class:</p> <pre><code>public static class ReflectionHelper { /// &lt;summary&gt; /// Gets method that will be invoked the event is raised. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;Object that contains the event.&lt;/param&gt; /// &lt;param name="eventName"&gt;Event Name.&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static MethodInfo GetEventInvoker(object obj, string eventName) { // --- Begin parameters checking code ----------------------------- Debug.Assert(obj != null); Debug.Assert(!string.IsNullOrEmpty(eventName)); // --- End parameters checking code ------------------------------- // prepare current processing type Type currentType = obj.GetType(); // try to get special event decleration while (true) { FieldInfo fieldInfo = currentType.GetField(eventName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.GetField); if (fieldInfo == null) { if (currentType.BaseType != null) { // move deeper currentType = currentType.BaseType; continue; } Debug.Fail(string.Format("Not found event named {0} in object type {1}", eventName, obj)); return null; } // found return ((MulticastDelegate)fieldInfo.GetValue(obj)).Method; } } </code></pre> <p>Additional information:</p> <ul> <li>Event in same class: worked. </li> <li>Event in different class, sub-class in same assembly: worked. </li> <li>Event in <strong>MY</strong> different assembly, debug &amp; release mode: worked. </li> <li>Event in WinForm, DevExpress, ...: did not work</li> </ul> <p>Any help is appreciated.</p>
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    1. USThang Tran
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      1. PORaise an event via reflection in c#
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    1. COI found it, see below.
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      1. USMark Sowul
    2. COi'm curious what is the context of you developing this helper - is it some sort of attempt at ui automation?
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      1. PORaise an event via reflection in c#
      1. USAaron Anodide
    3. COLook in your favorite C# language book for the *add* and *remove* accessors of an event. Used extensively by Winforms, only auto-generated implementations of these accessor have the backing field you are looking for. The name of which also depends on the compiler used btw. Blows a pretty big hole in your plans.
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      1. USHans Passant
 

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