16-9-2008 11:36:46
Mới tìm được cái này hay hay, copy cho anh em xem. Đó là late binding, tức là gọi function sau.

MethodInfo mi;
object result = null;
object[] args = new object[] {"ABC123"};
try
{
Assembly assemblyInstance = Assembly.LoadFrom(@"c:\AssemblyDir\SomeControls.dll");
Type[] types = assemblyInstance.GetTypes();
foreach (Type t in types)
{
mi = t.GetMethod("GetUserName");
if (mi != null)
{
string typeName = t.FullName;
object lateBoundObj = Asm.CreateInstance(typeName);
result = t.InvokeMember (MethodName, BindingFlags.Public | BindingFlags.InvokeMethod | BindingFlags.Instance, null, lateBoundObj, args);
break;
}
}
string userName = result.ToString();
MessageBox("User Name is: {0}", userName)
}
catch(Exception ex)
{
MessageBox.Show(ex.Message)
}

16-9-2008 11:41:16
Còn một cái nữa cũng khá hay

class Class1{
[DllImport("kernel32")]
public extern static int LoadLibrary(string lpLibFileName);
[DllImport("kernel32")]
public extern static bool FreeLibrary(int hLibModule);
[DllImport("kernel32", CharSet=CharSet.Ansi)]
public extern static int GetProcAddress(int hModule, string lpProcName);
/*
[DllImport("msjava", CharSet=CharSet.Unicode)]
public extern static int call(int funcptr, int hwnd, string message, string title, int flags);
*/
[DllImport("Invoke", CharSet=CharSet.Unicode)]
public extern static int InvokeFunc(int funcptr, int hwnd, string message, string title, int flags);


static void Main(string[] args) {
int hmod=LoadLibrary("User32");
int funcaddr=GetProcAddress(hmod, "MessageBoxW");
int result=InvokeFunc(funcaddr, 0, "Hello World", ".Net dynamic export invocation", 1 /*MB_OKCANCEL*/);
Console.WriteLine("Result of invocation is " + result);

FreeLibrary(hmod);

Console.WriteLine("Press any key to continue...");
Console.ReadLine();
}
}