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POc# execute code inside custom attribute
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  1. POc# execute code inside custom attribute
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    copied!<blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/1164978/why-does-my-net-attribute-not-perform-an-action">Why does my .NET Attribute not perform an action?</a> </p> </blockquote> <p>Hi,</p> <p>This may soundlike a very dumb question and I don't know what is possible here as all the "custom attribute" tutorials on the net are pretty much the same and they don't address what I want to do. I've seen some code out there where code is written inside attribute classes, eg: <a href="http://www.singingeels.com/Articles/Logging_with_ASPNET_MVC_Action_Filters.aspx" rel="nofollow noreferrer">Logging with ASP.NET MVC Action Filters</a> and I am wondering how this code is ever executed.</p> <p>If I have for example the following code:</p> <pre><code>public class Test { [RestrictedAttribute("RegisteredMember")] public void DoSomething() { //this code can only be executed if the logged-in user //is a member of the RegisteredMember group } } </code></pre> <p>Then the custom Attribute RestrictedAttribute would be something like this:</p> <pre><code>[AttributeUsage(AttributeTargets.Method)] public class RestrictedAttribute : System.Attribute { /// &lt;summary&gt; /// Make this code restricted to users with a required role /// &lt;/summary&gt; /// &lt;param name="requiredRole"&gt;The role required to execute this method&lt;/param&gt; public RestrictedAttribute(string requiredRole) { //validate if member is in role, else throw exception throw new MemberNotInRoleException(requiredRole); } public new string ToString() { return "Access needs to be granted"; } } </code></pre> <p>Now the problem is that I can't get the MemberNotInRoleException to be thrown when I execute the Test.DoSomething() method.</p> <p>Perhaps I am just missing the entire concept of custom attributes, feel free to explain.</p>
 

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