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    <p>Even though C# doesn't directly support module initialization we can implement it using reflection and static constructors. To do this we can define a custom attribute and use it find classes that need to be initialized on module loading:</p> <pre><code>public class InitOnLoadAttribute : Attribute {} private void InitAssembly(Assembly assembly) { foreach (var type in GetLoadOnInitTypes(assembly)){ var prop = type.GetProperty("loaded", BindingFlags.Static | BindingFlags.NonPublic); //note that this only exists by convention if(prop != null){ prop.GetValue(null, null); //causes the static ctor to be called if it hasn't already } } } static IEnumerable&lt;Type&gt; GetLoadOnInitTypes(Assembly assembly) { foreach (Type type in assembly.GetTypes()) { if (type.GetCustomAttributes(typeof(InitOnLoadAttribute), true).Length &gt; 0){ yield return type; } } } public MyMainClass() { //init newly loaded assemblies AppDomain.CurrentDomain.AssemblyLoad += (s, o) =&gt; InitAssembly(o.LoadedAssembly); //and all the ones we currently have loaded foreach(var assembly in AppDomain.CurrentDomain.GetAssemblies()){ InitAssembly(assembly); } } </code></pre> <p>on classes that we need to initialize immediately we add that code to their static constructor (which will be run once even if the property getter is accessed multiple times) and add the custom attribute we added to expose this functionality.</p> <pre><code>[InitOnLoad] class foo { private static bool loaded { get { return true; } } static foo() { int i = 42; } } </code></pre>
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    1. POC# equivalent of DllMain in C (WinAPI)
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    1. COThis doesn't answer the question as the OP is looking for a way to interact with a legacy application.
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      1. USRitch Melton
    2. CO@RitchMelton I don't follow. The OP is trying to do one time initialization on managed DLLs either from a managed application or from an unmanaged application that is hosting the CLR. In the first case you would add the code in the MyMainClass constructor near start up and in the second you would most likely put it in the method you initially pass to `ExecuteInDefaultAppDomain`. In either case you get the functionality the OP is looking for.
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    3. COHes trying to interact with a legacy app, not a managed one.
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