1.在项目中添加EventAggregator类库，添加EventAggregatorRepository类和GetInputMessages类。
using Microsoft.Practices.Prism.PubSubEvents;
using Microsoft.Practices.Prism.Regions;
using System;
namespace EventAggregatorPratice
{
public class EventAggregatorRepository
{
public EventAggregatorRepository()
{
eventAggregator = new EventAggregator();
}
public IEventAggregator eventAggregator;
public static EventAggregatorRepository eventRepository = null;
//单例，保持内存唯一实例
public static EventAggregatorRepository GetInstance()
{
if (eventRepository == null)
{
eventRepository = new EventAggregatorRepository();
}
return eventRepository;
}
}
}
using Microsoft.Practices.Prism.PubSubEvents;
namespace EventAggregatorPratice
{
public class GetInputMessages : PubSubEvent<string>
{
}
}
其中EventAggregatorRepository提供事件聚合实例，GetInputMessages为定义的事件类型。
2.订阅事件
添加对EventAggregator的引用，在XXViewModel初始化时订阅
public void SetSubscribe()
{
EventAggregatorRepository
.GetInstance()
.eventAggregator
.GetEvent<GetInputMessages>()
.Subscribe(ReceiveMessage, ThreadOption.UIThread, true);
}
public void ReceiveMessage(string messageData)
{
//dosomething
}
public XXViewModel()
{
InitializeComponent();
SetSubscribe();
}
3.发布事件
在其他ViewModel中添加对EventAggregato的引用，发布事件
public static void Print(string Meesage)
{
EventAggregatorRepository
.GetInstance()
.eventAggregator
.GetEvent<GetInputMessages>()
.Publish(Meesage);
}
以上就能实现不同ViewModel间传递参数
