把DLL加载到内存可解决问题。

void T1()    {        var p = @"D:\Document\Unity\TestDll\bin\Release\TestDll.dll";        byte[] bin;        using (var fs = new FileStream(p, FileMode.Open))        {            using (var br = new BinaryReader(fs))            {                bin = br.ReadBytes(Convert.ToInt32(fs.Length));            }        }        var assembly = Assembly.Load(bin);        var t = assembly.GetType("TestDll.test");        var instance = Activator.CreateInstance(t);        var m = t.GetMethod("add");        Debug.Log(m.Invoke(instance, new object[] { 1, 2 }));    }