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POHow to instantiate a class that is declared in a C# DLL?
 

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  1. POHow to instantiate a class that is declared in a C# DLL?
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    <p>I have a DLL written in C#. In this DLL there is a class that is defined. Let's assume that the code of this DLL is :</p> <pre><code>namespace unloadableDLL { public class DivisionClass { public /*static*/ long Division(long x, long y) { // We deliberately do not use a try catch to catch divide by 0 exceptions return (x / y); } } } </code></pre> <p>Now, I want to load dynamically this DLL in a test program. I need to see what happens if I divide by zero in the two following cases : 1) DLL is loaded directly (without using an AppDomain) 2) DLL is not loaded directly, an AppDomain is created first and then it loads the DLL.</p> <p>I'm completely new in C#, by new I mean I've started less than 4 hours ago but I have a C++ background.</p> <p>My problem is that in my test program, I need to instanciate a DivisionClass Object but this one is declared only in the DLL. => Resolved</p> <p>My test program is </p> <pre><code>class Program { [PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")] static void Main(string[] args) { // Load the DLL Console.WriteLine("Attempting to load unloadableDLL"); Assembly a = Assembly.LoadFrom("./unloadableDLL.dll"); unloadableDLL.DivisionClass divisionObject = (unloadableDLL.DivisionClass)a.CreateInstance("unloadableDLL.DivisionClass"); long number = divisionObject.Division(8, 2); Console.WriteLine(number); } } </code></pre> <p>I don't know what but the compilers keeps telling me that Static member unloadableDLL.DivisionClass.Division(lon, long) cannot be accessed with an instance reference; qualify it with a typename instead.</p> <p>Thank you all</p>
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    1. USMichel L
    1. USMichel L
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    1. COdo you mean calling DivisionClass.Division(x, y) which actually doesn't instantiate the DivisionClass, since it's a static method?
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      1. USAdrian Iftode
    2. COWhat have you tried so far? Please note that you don't need to create an instance as `Division` is a static method.
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      1. POHow to instantiate a class that is declared in a C# DLL?
      1. USDaniel Hilgarth
    3. COcall directly from your project reference for.eg `unloadableDLL.DivisionClass.Division(100,10)`. Since it is static method you don't need to create an instance.
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