Now I writing a simple program with c# and bulding .DLL (This is the c#)

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; using System.Collections; using System.Timers;

namespace TestDll { public class TestClass { Queue myQueue = new Queue(); private System.Timers.Timer timerA; int direction = 0;

    public TestClass()
    {
        timerA = new System.Timers.Timer(100);
        timerA.Elapsed += new System.Timers.ElapsedEventHandler(timerEvent);
        timerA.Enabled = true;
    }

    private void timerEvent(object source, System.Timers.ElapsedEventArgs e)
    {
        myQueue.Enqueue(direction);
        direction = (direction + 1) % 4;
        if (myQueue.Count > 10)
        {
            myQueue.Dequeue();
        }
    }

    public int GetD()
    {
        int r = -1;
        if (myQueue.Count > 0)
        {
            return Convert.ToInt32(myQueue.Dequeue());
        }
        else
        {
            return -1;
        }
    }

    public int iNowMiliSec()
    {

        int iRtn = 0;
        try 
        {
            iRtn = DateTime.Now.Millisecond;
        }
        catch (Exception errMsg)
        {
            Debug.WriteLine(errMsg.ToString());
        }
        return iRtn;
    }
}

}

And I put it(DLL) to Unity to test plugins. I create a c# to import the function in Unity.

using UnityEngine; using System.Collections; using System; using System.Runtime.InteropServices;

public class PluginsTest : MonoBehaviour {

[DllImport ("TestDll")]
private static extern int iNowMiliSec();

[DllImport ("TestDll")]
private static extern int GetD();

void Start () {
Debug.Log(iNowMiliSec());
Debug.Log(GetD());
}

}

But when I play...Unity say.... EntryPointNotFoundException: iNowMiliSec PluginsTest.Start () (at Assets/PluginsTest/Script/PluginsTest.cs:12)

so...where I miss or wrong??