Question

我在用户控件中有3个按钮，我想显示和隐藏WPF应用程序中的一个按钮或来自用户控件。它不适合我。我已经实现了INotifyPropertChanged接口来通知View。请检查一下。

<UserControl x:Class="WPFUserControl.UserControl1"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         xmlns:vis="clr-namespace:WPFUserControl"
         d:DesignHeight="300" d:DesignWidth="300">
<UserControl.Resources>
    <vis:BoolToVisibilityConverter x:Key="BoolToVis" ></vis:BoolToVisibilityConverter>
</UserControl.Resources>
<Grid>
    <Button Content="Button1" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75"/>
    <Button Content="Button2" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="106,0,0,0"/>
    <Button Content="ShowHide" Visibility="{Binding IsShowHideVisible, Converter={StaticResource BoolToVis}, ConverterParameter=False}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="215,0,0,0"/>

</Grid>

public partial class UserControl1 : UserControl, INotifyPropertyChanged
{
    private bool isShowHideVisible;
    public bool IsShowHideVisible
    {
        get { return isShowHideVisible; }
        set
        {
            if(isShowHideVisible!=value)
            {
                isShowHideVisible = value;
            }
        }
    }
    public UserControl1()
    {
        InitializeComponent();
       // IsShowHideVisible = false;
    }

    private void OnPropertyChange(string pPropertyName)
    {
        if(PropertyChanged!=null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(pPropertyName));
        }

    }

    public event PropertyChangedEventHandler PropertyChanged;
}

Answer 1

在IsShowHideVisible-Property的setter中，您必须在OnPropertyChanged("IsShowHideVisible")之后立即致电isShowHideVisible = value;。

您的财产看起来像是：

public bool IsShowHideVisible
{
    get { return isShowHideVisible; }
    set
    {
        if(isShowHideVisible!=value)
        {
            isShowHideVisible = value;
            OnPropertyChanged("IsShowHideVisible");
        }
    }
}

如果您使用.net 4.5或更高版本，则可以重写OnPropertyChanged - 方法，如：

private void OnPropertyChange([CallerMemberName]string pPropertyName = null)
{
    if(PropertyChanged!=null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(pPropertyName));
    }
}

与您的财产相比，您只需拨打OnPropertyChanged();而不是OnPropertyChanged("IsShowHideVisible");

Answer 2

在构造函数中添加this.DataContext = this并在set字段中添加OnPropertyChange（“IsShowHideVisible”）后，其工作。

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在WPF用户控件中显示/隐藏控件

2 个答案: