C# MVVM、对话服务和对话结果

我目前正在学习WPF/MVVM，并一直在使用以下问题中的代码使用对话服务显示对话框（包括Julian Dominguez的布尔更改）：

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显示对话框效果很好，但是对话框结果总是错误的，尽管对话框实际上正在显示。我的DialogViewModel当前为空，我认为可能需要将DialogViewModel“连接”到RequestCloseDialog事件。是这样吗？

您的DialogViewmodel是否实现IDialogResultVMHelper？视图/数据模板是否有命令绑定到引发RequestCloseDialog的DialogViewmodel

乙二醇

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谢谢真是太棒了！另外，我还了解了懒惰加载的世界！

public class DialogViewmodel : INPCBase, IDialogResultVMHelper
{
    private readonly Lazy<DelegateCommand> _acceptCommand;

    public DialogViewmodel()
    {
        this._acceptCommand = new Lazy<DelegateCommand>(() => new DelegateCommand(() => InvokeRequestCloseDialog(new RequestCloseDialogEventArgs(true)), () => **Your Condition goes here**));
    }

    public event EventHandler<RequestCloseDialogEventArgs> RequestCloseDialog;

    private void InvokeRequestCloseDialog(RequestCloseDialogEventArgs e)
    {
        var handler = RequestCloseDialog;
        if (handler != null) 
            handler(this, e);
    }
}

<StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Right" MinHeight="30">
    <Button IsDefault="True" Content="Übernehmen" MinWidth="100" Command="{Binding AcceptCommand}"/>
    <Button IsCancel="True" Content="Abbrechen" MinWidth="100"/>
</StackPanel>

var dialog = new DialogViewmodel();
var result = _dialogservice.ShowDialog("My Dialog", dialog );

if(result.HasValue && result.Value)
{
    //accept true
}
else
{
    //Cancel or false
}