CODEWITHSUNDEEP
c#.netdll
Rakesh Shah
Rakesh Shah

Reputation: 61

Reflection Reading DLL and adding that to a list of type Interface

I have a List of type ITemp. ITemp is a interface.

List<ITemp> temp = new List<ITemp>();

Now what I have to do is to read all the dlls from Specific file Location and add that into this temp list so what I am doing is this :

 List<Assembly> allAssemblies = new List<Assembly>();
 string path = Path.GetDirectoryName("C:\\TemplatesDLL\\");

 foreach (string dll in Directory.GetFiles(path, "*.dll"))
 {
     allAssemblies.Add(Assembly.LoadFile(dll));
 }

  foreach (Assembly assembly in allAssemblies)
{
   var DLL = Assembly.LoadFile(assembly.Location.ToString());
    foreach (var t in DLL.GetTypes())
    {
         Activator.CreateInstance(t);
          var constructors = t.GetConstructors();
          temp.Add(t.GetConstructors()); // here I have to add all the dll that implements ITemp interfaces
      }
 }

adding the interface something like this if its in the same project 

temp.Add(new TestTemp());

here TestTemp is a C# file in the same project. Now I move this TestTemp in to a DLL file. And Read it from the same application and add into the list.

Thanks in Advance.

Upvotes: 1

Views: 1164

Answers (2)

Rakesh Shah
Rakesh Shah

Reputation: 61

I got it.

    List<Assembly> allAssemblies = new List<Assembly>();
    string path = Path.GetDirectoryName("C:\\TemplatesDLL\\");

    List<ITemp> temp = new List<ITemp>();
    foreach (string dll in Directory.GetFiles(path, "*.dll"))
    {
          allAssemblies.Add(Assembly.LoadFile(dll));
    }
    foreach (Assembly assembly in allAssemblies)
    {
         var DLL = Assembly.LoadFile(assembly.Location.ToString());
         Type[] types = DLL.GetTypes();
         if (typeof(ITemp).IsAssignableFrom(types[0]))
         {
              temp.Add(Activator.CreateInstance(types[0]) as ITemp); //adding all the instance into the list that is what I was looking for.
         }
    }

Upvotes: 1

AaronLS
AaronLS

Reputation: 38367

I actually needed to do this recently. This example only gets the first type, but you could easily modify it to return a list and iterate the list.

var dll = Assembly.LoadFile(@"C:\SimplePlugin.dll");
Type pluginType = dll.GetExportedTypes()
    .Where(t => typeof(SimplePluginContracts.ISomePlugin).IsAssignableFrom(t) 
         && !t.IsInterface).First();

SimplePluginContracts.ISomePlugin plugin = 
    (SimplePluginContracts.ISomePlugin)Activator.CreateInstance(pluginType);

This question covers variations on this, and the top answer has a good discussion of nuances of this technique that my simple example doesn't handle:

Getting all types that implement an interface

You might consider also filtering out non-public classes, in case your DLL has some classes not intended to be loaded which also implement the interface.

Upvotes: 0

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