C# 如何从IEventAggregator中的事件初始化ViewModel中的属性？

如果我有Microsoft.Practices.Prism.Events.IEventAggregator实例：

eventAggregator.GetEvent<MyEvent>.Subscribe(SomeMethod);

---

我在ViewModel中有一个属性，我想使用MyEvent类中的成员初始化它，我如何才能做到这一点？

Prism不会将属性从MyEvent类传递给SomeMethod。它将有效载荷作为DTO传递给：

public class MyEvent: CompositePresentationEvent<MyEventArgs> {}

public class MyEventArgs { int MyIntValue; }

public class Subscriber
{
  public Subscriber
  {
    eventAggregator.GetEvent<MyEvent>().Subscribe(SomeMethod);
  }

  public void SomeMethod(MyEventArgs e)
  {
    MessageBox.Show(e.MyIntValue);
  }
}

public class Publisher
{
  public void SendMinusOne()
  {
    var args = new MyEventArgs() { MyIntValue = -1 };
    eventAggregator.GetEvent<MyEvent>().Publish(args);
  }
}