如果想创建一个包含在一个未加载程序集中的类，一般可以使用两种方法：
（1）使用System.Activator.CreateInstance()方法；

（2）使用反射获取类的构造函数的签名信息，并使用Invoke方法调用。

以下简单的举了两个例子说明这两种方法的用法：

object CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, object[] args, CultureInfo culture, object[] activationAttributes)
{
      object obj1 = null;
      try
      {
            try
            {
                  bool flag1;
                  object obj2;
                  if (activationAttributes != null)
                  {
                        ActivationServices.PushActivationAttributes(this, activationAttributes);
                  }
                  if (args == null)
                  {
                        args = new object[0];
                  }
                  int num1 = args.Length;
                  if (binder == null)
                  {
                        binder = Type.DefaultBinder;
                  }
                  if ((((num1 == 0) && ((bindingAttr & BindingFlags.Public) != BindingFlags.Default)) && ((bindingAttr & BindingFlags.Instance) != BindingFlags.Default)) && (this.IsGenericCOMObjectImpl() || this.IsSubclassOf(RuntimeType.valueType)))
                  {
                        return this.CreateInstanceImpl(((bindingAttr & BindingFlags.NonPublic) == BindingFlags.Default) && true);
                  }
                  MethodBase[] baseArray1 = this.GetMemberCons(bindingAttr, CallingConventions.Any, null, num1, false, out flag1);
                  if (baseArray1 == null)
                  {
                        if (activationAttributes != null)
                        {
                              ActivationServices.PopActivationAttributes(this);
                              activationAttributes = null;
                        }
                        throw new MissingMethodException(string.Format(Environment.GetResourceString("MissingConstructor_Name"), this.FullName));
                  }
                  if (((num1 == 0) && (baseArray1.Length == 1)) && ((bindingAttr & BindingFlags.OptionalParamBinding) == BindingFlags.Default))
                  {
                        return Activator.CreateInstance(this, true);
                  }
                  MethodBase base1 = binder.BindToMethod(bindingAttr, baseArray1, ref args, null, culture, null, out obj2);
                  if (base1 == null)
                  {
                        if (activationAttributes != null)
                        {
                              ActivationServices.PopActivationAttributes(this);
                              activationAttributes = null;
                        }
                        throw new MissingMethodException(string.Format(Environment.GetResourceString("MissingConstructor_Name"), this.FullName));
                  }
                  if (flag1)
                  {
                        new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
                  }
                  obj1 = ((ConstructorInfo) base1).Invoke(bindingAttr, binder, args, culture);
                  if (obj2 != null)
                  {
                        binder.ReorderArgumentArray(ref args, obj2);
                  }
                  return obj1;
            }
            finally
            {
                  if (activationAttributes != null)
                  {
                        ActivationServices.PopActivationAttributes(this);
                  }
            }
      }
      catch (Exception)
      {
            throw;
      }
      return obj1;
}