在带有参数的MVVM Light中打开新窗口的最佳实践

问题描述：

我对mvvm和mvvm light还是比较陌生，但是我想我了解它的大致概念.我不明白是否要打开新窗口，但是该窗口需要调用者提供的数据?什么是将数据获取到新窗口的最佳实践?如果我将数据传递给构造函数，则意味着我需要后面代码中的代码才能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.

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.

答

一个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，然后将视图绑定到视图模型，然后再将其显示在屏幕上.

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.

这是DialogService的非常简单的实现:

here is a very very simple implementation of a DialogService:

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
}

在带有参数的MVVM Light中打开新窗口的最佳实践

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