尝试将我的ViewModel中的属性绑定到DataTrigger [英] Trying to bind a property in my ViewModel to a DataTrigger

问题描述

我的ViewModel中有一个名为IsEditing的布尔属性，我想基于值为False将某些样式应用于各种元素。

I have a boolean property named IsEditing in my ViewModel and I'm wanting to apply certain styles to various elements based on the value being False.

My View的DataContext是正确链接到我的ViewModel，一切都按预期工作。我也有一些< g class =" gr_ gr_38 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace"数据-GR-ID =" 38"
id =" 38">非< / g> -DataTrigger触发器也按预期工作。但是，当我尝试将IsEditing绑定到DataTrigger时似乎没有任何改变。

My View's DataContext is properly linked to my ViewModel and everything is working as expected. I also have some <g class="gr_ gr_38 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="38" id="38">non</g>-DataTrigger triggers that work as expected too. However, when I try to bind IsEditing to a DataTrigger nothing seems to change.

<Style.Triggers>

    <DataTrigger Binding="{Binding Path=IsEditing" Value="False">

        <Setter Property="Opacity" Value=".15" />

    </DataTrigger>

</Style.Triggers>

我在这里可以缺少什么？谢谢！

What could I be missing here? Thanks!

推荐答案

嗨T Gregory，

Hi T Gregory,

I做一个关于如何使用DataTrigger以及如何在DataTrigger中使用Binding的示例。

I do one sample about how to use DataTrigger and how to use Binding in DataTrigger.

我在窗口中添加了一个Button和TextBox。请不要忘记实施
INotifyPropertyChanged 界面以通知属性已更改。

I add one Button and TextBox in window. Please don't forget to implement INotifyPropertyChanged interface to notify property changed.

  <StackPanel>
        <Button
            Name="btn1"
            Width="200"
            Height="30"
            Content="btn1" Click="btn1_Click"/>
        <TextBlock
            Margin="0,20,0,0"
            HorizontalAlignment="Center"
            FontSize="48">
            <TextBlock.Style>
                <Style TargetType="TextBlock">
                    <Setter Property="Text" Value="No" />
                    <Setter Property="Foreground" Value="Red" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Path=IsEditing}" Value="True">
                            <Setter Property="Text" Value="Yes!" />
                            <Setter Property="Foreground" Value="Green" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </TextBlock.Style>
        </TextBlock>
    </StackPanel>

 public partial class Window19 : Window
    {
        public boolenclass boolclass { get; set; }
        public Window19()
        {
            InitializeComponent();
            boolclass = new boolenclass();
            this.DataContext =boolclass;
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            if(boolclass.IsEditing==false)
            {
                boolclass.IsEditing = true;
            }
            else
            {
                boolclass.IsEditing = false;
            }
            
        }
    }

    public class boolenclass:ViewModelBase
    {
        private Boolean _IsEditing;
        public Boolean IsEditing
        {
            get { return _IsEditing; }
            set
            {
                _IsEditing = value;
                RaisePropertyChanged("IsEditing");
            }
        }
        public boolenclass()
        {
            IsEditing = false;
        }
    }

实施INotifyPropertyChanged：

Implementing INotifyPropertyChanged:

 public class ViewModelBase:INotifyPropertyChanged
    {
        
        public event PropertyChangedEventHandler PropertyChanged;

        
        public void RaisePropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

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感谢您的理解。

HTTPS？ //social.msdn.microsoft.com/Forums/vstudio/en-US/ff3f0128-5448-4d4b-ab6f-2d71a6afb7bc/bringing-a-usercontrol-into-an-existing-project?forum=wpf#eda48411-5440- 4b64-90cc-67966b9deca3

最好的问候，

Cherry

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