Dynamicly load DLL.

[flnhst]

how do i dynamicly load a user input given DLL in C#? The DLL is also written in C# and .NET. I have googled around, but i couldnt find anything.

 

[Smeat]

Look up reflection in msdn. I think the method you are looking for is called LoadAssemblyAndUnWrap or something similar.

HTH

Smeat

 

[chiph]

There's 4 methods you can use on the Assembly object:
Load()
LoadFile()
LoadFrom()
LoadWithPartialName()

Once you've loaded it, you would then call GetMethods on it to get a list of methods, and then call MethodBase.Invoke on the method you want to call.

You'll need a using statement for System.Reflection to do most of this.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

 

[Smeat]

Just dug out this sample from one of my previous projects, may be of some use:

Be sure to include the reflection assembly:

using System.Reflection;

try
{						
  //Load Diary assembly
  Assembly assembly = Assembly.LoadFrom(System.AppDomain.CurrentDomain.BaseDirectory + "Bin\\ShowroomSuite.Library.Diary.dll");
							   
								// Walk through each type in the assembly
								foreach (Type type in assembly.GetTypes ()) 
								{							if (type.IsClass == true && type.FullName == "MyNamespace.MyClassName") 
									{
										// Create parameter list
										object[] arguments = new object [] {Dr};
										objAppointmentList = type.InvokeMember("MyMethodName", BindingFlags.Default | BindingFlags.InvokeMethod, null, null, arguments);
									}
								}
							}
							catch (Exception ex)
							{
								//Code ommitted for clarity 
							}
							finally
							{
//Code ommitted for clarity 
							}

HTH

Smeat

 

[flnhst]

Thanks! It worked.

Here is the code that i used:

static void Main(string[] args)
		{
			Assembly T = Assembly.LoadFrom("CSDLL.dll");

			foreach ( Type A in T.GetTypes() )
			{
				if (A.IsClass && A.Name == "CSDLL")
				{
					Console.WriteLine("Found. Invoking Function.");

					object[] Parameters = new Object[2];

					Parameters[0] = 2;
					Parameters[1] = 5;

					A.GetMethod("TestFunction").Invoke(null, Parameters);
				}
				else
				{
					Console.WriteLine("Class not found.");
					Console.WriteLine(A.Name);
					Console.WriteLine(Convert.ToString(A.IsClass));
				}
			}

			Console.ReadLine();
		}