wpf 在 MVVM Light 中使用参数打开新窗口的最佳实践
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Best Practice to open a New Window in MVVM Light with Parameters
提问by Ian Overton
I am fairly new to mvvm and mvvm light, but I think I understand the general idea of it. What I don't understand is if I want to open a new window, but that window needs data from the caller what is the best practice to get that data to the new window? If I pass the data to the constructor then that means I need code in the code behind to pass it to the view model. I can't use messaging, because it isn't basic data.
我对 mvvm 和 mvvm light 还很陌生，但我想我了解它的总体思路。我不明白的是，如果我想打开一个新窗口，但该窗口需要来自调用者的数据，将这些数据传送到新窗口的最佳做法是什么？如果我将数据传递给构造函数，那么这意味着我需要后面的代码中的代码将其传递给视图模型。我不能使用消息传递，因为它不是基本数据。
采纳答案by Backlash
One popular choice is to use a service class that will create a view/viewmodel and display the new view. Your view model constructor and/or method/property could receive the data from the caller and then the view would be bound to the viewmodel prior to displaying it on the screen.
一种流行的选择是使用将创建视图/视图模型并显示新视图的服务类。您的视图模型构造函数和/或方法/属性可以从调用方接收数据，然后视图将在将其显示在屏幕上之前绑定到视图模型。
here is a very very simple implementation of a DialogService:
这是 DialogService 的一个非常简单的实现：
public class DialogService : IDisposable
{
#region Member Variables
private static volatile DialogService instance;
private static object syncroot = new object();
#endregion
#region Ctr
private DialogService()
{
}
#endregion
#region Public Methods
public void ShowDialog(object _callerContentOne, object _callerContentTwo)
{
MyDialogViewModel viewmodel = new MyDialogViewModel(_callerContentOne, _callerContentTwo);
MyDialogView view = new MyDialogView();
view.DataContext = viewmodel;
view.ShowDialog();
}
#endregion
#region Private Methods
#endregion
#region Properties
public DialogService Instance
{
get
{
if (instance == null)
{
lock (syncroot)
{
if (instance == null)
{
instance = new DialogService();
}
}
}
return instance;
}
}
#endregion
}
