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POUnload external class library in c#?
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/5034654/help-needed-with-unloading-dlls-from-appdomain-still-not-working-even-with-s">Help needed with unloading .DLL’s from AppDomain - Still not working even with ShadowCopy</a> </p> </blockquote> <p>In my project I use the MEF framework to provide extensibility; The main program can be extended by another Lib.dll class library.</p> <p>The problem is that I need to swap this Lib.dll with another one <strong>WITHOUT CLOSING</strong> the main program.</p> <p>So how can I unload this Lib.dll to swap it ?</p> <p><strong>Update</strong></p> <p>the main program is in form:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel.Composition; using System.ComponentModel.Composition.Hosting; namespace SimpleCalculator3 { public interface ICalculator { String Calculate(String input); } public interface IOperation { int Operate(int left, int right); } public interface IOperationData { Char Symbol { get; } } [Export(typeof(IOperation))] [ExportMetadata("Symbol", '+')] class Add : IOperation { public int Operate(int left, int right) { return left + right; } } [Export(typeof(IOperation))] [ExportMetadata("Symbol", '-')] class Subtract : IOperation { public int Operate(int left, int right) { return left - right; } } [Export(typeof(ICalculator))] class MySimpleCalculator : ICalculator { [ImportMany] IEnumerable&lt;Lazy&lt;IOperation, IOperationData&gt;&gt; operations; public String Calculate(String input) { int left; int right; Char operation; int fn = FindFirstNonDigit(input); //finds the operator if (fn &lt; 0) return "Could not parse command."; try { //separate out the operands left = int.Parse(input.Substring(0, fn)); right = int.Parse(input.Substring(fn + 1)); } catch { return "Could not parse command."; } operation = input[fn]; foreach (Lazy&lt;IOperation, IOperationData&gt; i in operations) { if (i.Metadata.Symbol.Equals(operation)) return i.Value.Operate(left, right).ToString(); } return "Operation Not Found!"; } private int FindFirstNonDigit(String s) { for (int i = 0; i &lt; s.Length; i++) { if (!(Char.IsDigit(s[i]))) return i; } return -1; } } class Program { private CompositionContainer _container; [Import(typeof(ICalculator))] public ICalculator calculator; private Program() { //An aggregate catalog that combines multiple catalogs var catalog = new AggregateCatalog(); //Adds all the parts found in the same assembly as the Program class catalog.Catalogs.Add(new AssemblyCatalog(typeof(Program).Assembly)); //catalog.Catalogs.Add(new DirectoryCatalog("C:\\Users\\SomeUser\\Documents\\Visual Studio 2010\\Projects\\SimpleCalculator3\\SimpleCalculator3\\Extensions")); //Create the CompositionContainer with the parts in the catalog _container = new CompositionContainer(catalog); //Fill the imports of this object try { this._container.ComposeParts(this); } catch (CompositionException compositionException) { Console.WriteLine(compositionException.ToString()); } } static void Main(string[] args) { Program p = new Program(); //Composition is performed in the constructor String s; Console.WriteLine("Enter Command:"); while (true) { s = Console.ReadLine(); Console.WriteLine(p.calculator.Calculate(s)); } } } } </code></pre> <p>and the extending Lib.dll is in form</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel.Composition; namespace ExtendedOperations { [Export(typeof(SimpleCalculator3.IOperation))] [ExportMetadata("Symbol", '%')] public class Mod : SimpleCalculator3.IOperation { public int Operate(int left, int right) { return left % right; } } } </code></pre> <p>that is it, I want to dynamically change code in Lib.dll and build it while the main program is running</p>
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    1. USCommunity
    1. USYasser Rabee
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    1. COYou need to unload the appdomain that it was loaded in.
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    2. COwhy you want to unload it...it wiil be expensive to load it again..
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    3. COI have updated my post with a code sample of what i want..
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      1. POUnload external class library in c#?
      1. USYasser Rabee
 

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