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how to use loaded DLLS assembly' methods which is referenced to another assembly?

Posted on 2012-03-12
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Last Modified: 2012-03-12
i have 2 assemblies. i added classlib1 into classLib2 references. like that:
soru1
USAGE:

namespace ClassLibrary2
{
    public class Class1
    {
        public Class1()
        {

        }

        public int GetSum(int a , int b)
        {
            try
            {
                ClassLibrary1.Class1 ctx = new ClassLibrary1.Class1();
                return ctx.Sum(a, b);
            }
            catch
            {
                return -1;
            }

        }
    }
}

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Also i want to load (class1lib and Class2Lib) another C# project dynamically by using AppDomain.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Reflection;
using System.Collections;
using System.Reflection.Emit;

namespace WcfService3
{
    public partial class Default : System.Web.UI.Page
    {
        public static ArrayList arryFiles { get; set; }
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            arryFiles = new ArrayList();
            List<byte[]> binaryList = new List<byte[]>();
            // string fileName = @"S:\Source\Yusuf.Karatoprak\plugin\ClassLibrary1.dll";
            DirSearch(@"S:\Source\Yusuf.Karatoprak\plugin");
            foreach (var filePath in arryFiles)
            {
                FileStream fileStream = File.OpenRead(filePath.ToString());
                byte[] buffer = new byte[fileStream.Length];
                fileStream.Read(buffer, 0, Convert.ToInt32(fileStream.Length));
                fileStream.Dispose();
                binaryList.Add(buffer);
                //Assembly[] assBefore = AppDomain.CurrentDomain.GetAssemblies();
              
                //AppDomain.CurrentDomain.Load(buffer);

                //Assembly[] assAfter = AppDomain.CurrentDomain.GetAssemblies();

                //Type t = Type.GetType("ClassLibrary1.Class1,ClassLibrary1");
            }

            new AssemblyLoader().LoadAndCall(binaryList);
        }
        static void DirSearch(string sDir)
        {
            try
            {
                foreach (string f in Directory.GetFiles(sDir, "*.dll"))
                {
                    if (!arryFiles.Contains(f))
                        arryFiles.Add(f);
                }
                foreach (string d in Directory.GetDirectories(sDir))
                {
                    if (d != null)
                    {
                        foreach (string f in Directory.GetFiles(d, "*.dll"))
                        {
                            if (!arryFiles.Contains(f))
                                arryFiles.Add(f);
                        }
                        DirSearch(d);
                    }
                    else
                        break;
                }

            }
            catch (System.Exception excpt)
            {
                throw new Exception(excpt.Message);

            }
        }
    }

    public class AssemblyLoader : MarshalByRefObject
    {
        public void LoadAndCall(List<byte[]> binaryList)
        {
            Assembly loadedAssembly=null;
            Assembly[] assBefore = AppDomain.CurrentDomain.GetAssemblies();
            foreach (byte[] binary in binaryList)
            {
                loadedAssembly = AppDomain.CurrentDomain.Load(binary);
                foreach (var assemblyName in loadedAssembly.GetReferencedAssemblies())
                    AppDomain.CurrentDomain.Load(assemblyName);
            }
            Assembly[] assAfter = AppDomain.CurrentDomain.GetAssemblies();
            object[] tt = { 3, 6 };
            Type type = loadedAssembly.GetType("ClassLibrary2.Class1");
            object loaded = loadedAssembly.CreateInstance("ClassLibrary2.Class1", true, BindingFlags.Instance | BindingFlags.Public | BindingFlags.CreateInstance, null, new object[] { }, null, null);
           // object obj = Activator.CreateInstance(type);
            
          

            ObjectCreateMethod inv = new ObjectCreateMethod(type); //Specify Type
            Object obj = inv.CreateInstance();

            MethodInfo minfo = type.GetMethod("GetSum", BindingFlags.Instance | BindingFlags.Public | BindingFlags.CreateInstance);
            int x = (int)minfo.Invoke(obj, new Object[] { 3, 6 });
            Console.WriteLine(x);
        }
    }

    public class ObjectCreateMethod
    {
        delegate object MethodInvoker();
        MethodInvoker methodHandler = null;

        public ObjectCreateMethod(Type type)
        {
            CreateMethod(type.GetConstructor(Type.EmptyTypes));
        }

        public ObjectCreateMethod(ConstructorInfo target)
        {
            CreateMethod(target);
        }

        void CreateMethod(ConstructorInfo target)
        {
            DynamicMethod dynamic = new DynamicMethod(string.Empty,
                        typeof(object),
                        new Type[0],
                        target.DeclaringType);
            ILGenerator il = dynamic.GetILGenerator();
            il.DeclareLocal(target.DeclaringType);
            il.Emit(OpCodes.Newobj, target);
            il.Emit(OpCodes.Stloc_0);
            il.Emit(OpCodes.Ldloc_0);
            il.Emit(OpCodes.Ret);

            methodHandler = (MethodInvoker)dynamic.CreateDelegate(typeof(MethodInvoker));
        }

        public object CreateInstance()
        {
            return methodHandler();
        }
    }

}

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Why can not load and Exception error return to me:
GetSum method not working
innerexception not load classlib1
Look inner exception: Could not load file or assembly 'ClassLibrary1 But i loaded Classlib2 abd Classlib1 . class2 depends on classlib1 how to use classlib1 method i want to use GetSum(int a , int b) method after load assemblies?
0
Comment
Question by:programmerist
  • 2
3 Comments
 
LVL 3

Expert Comment

by:zofcentr
Comment Utility
Is missing assembly file inside BIN directory of calling assembly (this one which is dynamically loading assemblies).
As you do not add references then normally it is not copied during build operation.
Check whether file exists and has correct version.

Other solution is to register it in GAC.
0
 

Author Comment

by:programmerist
Comment Utility
do you have any professional answer? with code and technical help
0
 
LVL 3

Accepted Solution

by:
zofcentr earned 500 total points
Comment Utility
I am not sure whether you comment was ironic and rude or not?
But I will try one more time.
Code of what ? It does not look that there is problem wit hcode.
I can not deliver code except some scripts to register assembly in GAC see under this link.

http://msdn.microsoft.com/en-us/library/ex0ss12c%28v=vs.80%29.aspx

Script for copying file I think is not needed ?
0

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