如何从ViewModel关闭Window

public static class DialogCloser
    {
        public static readonly DependencyProperty DialogResultProperty =
            DependencyProperty.RegisterAttached(
                "DialogResult",
                typeof(bool?),
                typeof(DialogCloser),
                new PropertyMetadata(DialogResultChanged));

        private static void DialogResultChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var window = d as Window;
            if (window != null)
            {
                window.DialogResult = e.NewValue as bool?;
            }
        }

        public static void SetDialogResult(Window target, bool? value)
        {
            target.SetValue(DialogResultProperty, value);
        }
    }

注册一个DialogResult依赖属性

然后在View端绑定这个依赖属性DialogResult：

<Window x:Class="mvvm_demo_close_window.ChildWindow"
        ...
        xmlns:xc="clr-namespace:mvvm_demo_close_window"
        xc:DialogCloser.DialogResult="{Binding DialogResult}">

然后在ViewModel端将这个当做正常的依赖属性去操作就行了,当this.DialogResult=true的时候就自动在ViewModel关闭了子窗口：

public class ChildWindowViewModel : ViewModelBase
    {
        private bool? dialogResult;
        public bool? DialogResult
        {
            get { return this.dialogResult; }
            set
            {
                this.dialogResult = value;
                RaisePropertyChanged("DialogResult");
            }
        }

        //用来接收关闭按钮的Command
        public ICommand CloseCmd
        {
            get
            {
                return new DelegateCommand((obj) =>
                {
                    this.DialogResult = true;
                });
            }
        }
    }

原文地址：https://www.cnblogs.com/SilveryBullet/p/8384919.html