[C＃]当从其他userControl更新vm时，如何刷新xaml绑定数据 [英] [C#]How to refresh xaml binding data when it's vm is updated from other userControl

问题描述

我有一个用户控件 在MainPage中，UserControl中的UserControlViewModel包含数据，MainPage中的MainPageViewModel包括ObservationCollection< data>，当我在UserControl中的数据发生变化时，我使用了   （（Window.Current.Content
as Frame）.content as MainPage）.MainPageViewModel.datas.single（）。item = value但是，MainPage中的XAML数据没有刷新。任何人帮助

I have a usercontrol  in MainPage,a UserControlViewModel in UserControl include data,a MainPageViewModel in MainPage include ObservationCollection<data>, When my data in UserControl changed,and I use   ((Window.Current.Content as Frame).content as MainPage).MainPageViewModel.datas.single().item= value to update however,the XAML data in MainPage didn't refresh . Anyone help

推荐答案

确保您的"数据" class实现了INotifyPropertyChanged接口，并在"item"的setter中引发了PropertyChanged事件。您尝试设置的属性：

Make sure that your "data" class implements the INotifyPropertyChanged interface and raise the PropertyChanged event in the setter of the "item" property that you are trying to set from:

public class data : INotifyPropertyChanged
    {
        private object _value
        public object item
        {
            get { return _value; }
            set { _value = value; NotifyPropertyChanged(); }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

请提供所有相关代码和标记摘要你需要任何进一步的帮助。

Please provide all relevant code and markup snippets if you need any further help.

希望有所帮助。

Hope that helps.

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Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question. Please don't ask several questions in the same thread.

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