我正在使用 L. Bugnion 的 MVVM Light Framework。
将客户 ID 等参数传递给 ViewModel 的构造函数的推荐方法有哪些?
编辑:
每个 ViewModel 我需要的参数不是跨模型共享的。它对每个 View 模型实例都是独一无二的。
最佳答案
//Create a container class to pass via messenger service
public class CarSelectedArgs
{
#region Declarations
public Car Car { get; set; }
#endregion
#region Constructor
public CarSelectedArgs(Car car)
{
Car = car;
}
#endregion
}
//example of view model sending message.
public class SendingViewModel : ViewModelBase
{
private Car _car;
public Car SelectedCar
{
get { return _car; }
set
{
_car = value;
if (value != null)
{
//messenger will notify all classes that have registered for a message of this type
Messenger.Default.Send(new CarSelectedArgs(value));
}
}
}
}
//Example of ViewModel registering to recieve a message
public class SampleViewModel : ViewModelBase
{
#region Constructor
public SampleViewModel()
{
Messenger.Default.Register<CarSelectedArgs>(this, OnCarSelected);
}
#endregion
#region LocalMethods
void OnCarSelected(CarSelectedArgs e)
{
var NewCar = e.Car;
}
#endregion
}
关于silverlight - MVVM : how to pass parameter to ViewModel's constructor,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4122074/