DLL made in C#, trying to import to another C# project (DLL can't be on root directory )

Question

Hi guys after a few hour searching and tying what i could find ( since most of I could find is the DLL made on C++ into a C# project and that is not what I want ) I come here with a question :D.

I'm trying to run the program, but want the DLL file to be on another directory ( For example the program is on c:\\Programs\\Program and DLL on c:\\Libs ).

I have made an DLL in C# that have various methods public, that I want to have access in my program.

The DLL I have something like this:

[ComVisible(true)]
[Guid("6E873AA1-1AD6-4325-BBFD-EF22A3EB80CC")]
public interface ITraducoes
{
    [ComVisible(true)]
    void changeLang(String lang);
    [ComVisible(true)]
    void translate(Control form);
    [ComVisible(true)]
    string toolTipText(Control form, String toolTip);
    [ComVisible(true)]
    string[] listText(Control form, String lista);
    [ComVisible(true)]
    string[] getMessagesArray();
    [ComVisible(true)]
    Hashtable getMessagesTable();
}
#region Traducoes Class
[ComVisible(true)]
[ClassInterface(ClassInterfaceType.AutoDual)]
[Guid("AE53E0A3-8261-4706-8861-0249F7390642")]
//[ProgId("ITranslate.Traducoes")]
public class Traducoes : ITraducoes
{...

And on the programa I have something like this:

[DllImport("ITranslate.dll", CallingConvention = CallingConvention.Cdecl)]
extern static void translate(Control form);
[DllImport("ITranslate.dll")]
extern static string[] getMessagesArray();

And then I call then like this:

public Form1(string[] args){
    InitializeComponent();                  
    translate(this);
    msg = getMessagesArray();

I hope I haven't miss anything, but if I do, I will do my best to provide it.

EDIT.

Forgot to say, that I'm geting this error

Unable to find an entry point named 'translate' in DLL 'ITranslate.dll'

Answer 1

You can't use DllImport to reference C# libraries.

Instead, add a reference to the DLL in your project and use it just as any other reference (eg. System.Windows.Forms etc.).

You don't have to have the class ComVisible or anything - all .NET assemblies expose all of their objects and metadata (somewhat limitable using private and such keywords, but in the end, you can get those too with a bit of work).