How to solve error The member "xxx" is not recognized or is not accessible

Question

I have created the following style but I get the error: "The member "WatterMarkText" is not recognized or is not accessible".
Can anyone help to fix the error?

 **<Style x:Key="PasswordWatermark" BasedOn="{StaticResource {x:Type PasswordBox}}" TargetType="{x:Type PasswordBox}">  
        <Setter Property="Width" Value="250"/>  
        <Setter Property="Height" Value="25"/>  
        <Setter Property="Margin" Value="10"/>  
        <Setter Property="PWB:PasswordBoxMonitor.IsMonitoring" Value="True"/>  
        <Setter Property="Template">  
            <Setter.Value>  
                <ControlTemplate TargetType="{x:Type PasswordBox}">  
                    <Border Name="Bd" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" SnapsToDevicePixels="true">  
                        <Grid>  
                            <ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>  
                            <TextBlock Text="{TemplateBinding WatterMarkText}"   
                                       Style="{StaticResource PwBoxWatterMarkTextStyle}"   
                                       Name="txtPrompt"/>  
                        </Grid>  
                    </Border>  
                    <ControlTemplate.Triggers>  
                        <Trigger Property="IsEnabled" Value="false">  
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>  
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>  
                        </Trigger>  
                        <Trigger Property="PWB:PasswordBoxMonitor.PasswordLength" Value="0">  
                            <Setter Property="Visibility" TargetName="txtPrompt" Value="Visible"/>  
                        </Trigger>  
                    </ControlTemplate.Triggers>  
                </ControlTemplate>  
            </Setter.Value>  
        </Setter>  
    </Style>**  

Answer 1

Hi,@Sarah . If you want to use code like below, you need to add DependencyProperty WatterMarkText to PasswordBox.

<PasswordBox WatterMarkText ="Hello World" />  

A common approach is to add Attached Dependency Property to the project.

 public class Helper  
    {  
        public static string GetWatterMarkText(DependencyObject obj)  
        {  
            return (string)obj.GetValue(WatterMarkTextProperty);  
        }  
  
        public static void SetWatterMarkText(DependencyObject obj, string value)  
        {  
            obj.SetValue(WatterMarkTextProperty, value);  
        }  
        public static readonly DependencyProperty WatterMarkTextProperty =  
           DependencyProperty.RegisterAttached("WatterMarkText", typeof(string), typeof(Helper),  
               new FrameworkPropertyMetadata(" ", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));  
    }  

Update your code as follows.

  <TextBox  Text="{Binding Path=(local:Helper.WatterMarkText), RelativeSource={RelativeSource TemplatedParent}}"  
                                           Style="{StaticResource PwBoxWatterMarkTextStyle}"  Name="txtPrompt">  

Styles added for testing.

Password :

 <Grid>  
        <PasswordBox Width="100" Height="50" local:Helper.WatterMarkText="Hello World" Style="{StaticResource PasswordWatermark}"/>  
    </Grid>  

The result:

By the way, you can pay attention to the difference between Template Binding and Binding.

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