WPF：在触发器中设置Clr属性

Question

I have a textbox and i want to set a Clr property from ViewModel to another property in ViewModel on Visibility Changed.

<TextBox Text="{Binding Property1}">
<TextBox.Style>
<Style TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
       <Style.Triggers>
       <Trigger Property="Visbility" Value="Collapsed">
          <Trigger.Setters>
             ///Set Property1 = Property2
          </Trigger.Setters>
       </Trigger>
</Style>
</TextBox>

Is there any way to do this?

Answer 1

Use an intermediary DependencyProperty and Right BindingMode Combination to achieve your desired Result :

 <TextBox Text="{Binding Property1}">
            <TextBox.Style>
                <Style TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
                    <Style.Triggers>
                        <Trigger Property="Visbility" Value="Collapsed">
                            <Trigger.Setters>
                                <Setter Property="Tag" Value="{Binding Property2}" />
                                <Setter Property="Tag" Value="{Binding Mode=OneWayToSource,Path=property1}" />
                            </Trigger.Setters>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Style>
        </TextBox>

I'm assuming that you want to set the value of property2(which is also a CLR property) in property1, which will ultimately set the Text Property of TextBox .

Answer 2

There can be a way to do this. You bind the Visibility of the TextBox to a clr property of your VM and in the setter of the clr visibility property change the value of Property1

<TextBox Text="{Binding Property1}" Visibility="{Binding Visibility, Converter={StaticResource ResourceKey=boolConvertor}}"></TextBox>

and in the VM

  public bool Visibility
    {
        get { return visibility; }
        set
        {
            visibility = value;
            if (visibility == false)
            {
                Property1 = Property2;
            }
            OnPropertyChanged();
        }
    }