这是一个演示如何在WPF中创建水印文本框的示例:

<Window x:Class="WaterMarkTextBoxDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WaterMarkTextBoxDemo"
    Height="200" Width="400">

    <Window.Resources>

        <SolidColorBrush x:Key="brushWatermarkBackground" Color="White" />
        <SolidColorBrush x:Key="brushWatermarkForeground" Color="LightSteelBlue" />
        <SolidColorBrush x:Key="brushWatermarkBorder" Color="Indigo" />

        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
        <local:TextInputToVisibilityConverter x:Key="TextInputToVisibilityConverter" />

        <Style x:Key="EntryFieldStyle" TargetType="Grid" >
            <Setter Property="HorizontalAlignment" Value="Stretch" />
            <Setter Property="VerticalAlignment" Value="Center" />
            <Setter Property="Margin" Value="20,0" />
        </Style>

    </Window.Resources>


    <Grid Background="LightBlue">

        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0" Background="{StaticResource brushWatermarkBackground}" Style="{StaticResource EntryFieldStyle}" >
            <TextBlock Margin="5,2" Text="This prompt dissappears as you type..." Foreground="{StaticResource brushWatermarkForeground}"
                       Visibility="{Binding ElementName=txtUserEntry, Path=Text.IsEmpty, Converter={StaticResource BooleanToVisibilityConverter}}" />
            <TextBox Name="txtUserEntry" Background="Transparent" BorderBrush="{StaticResource brushWatermarkBorder}" />
        </Grid>

        <Grid Grid.Row="1" Background="{StaticResource brushWatermarkBackground}" Style="{StaticResource EntryFieldStyle}" >
            <TextBlock Margin="5,2" Text="This dissappears as the control gets focus..." Foreground="{StaticResource brushWatermarkForeground}" >
                <TextBlock.Visibility>
                    <MultiBinding Converter="{StaticResource TextInputToVisibilityConverter}">
                        <Binding ElementName="txtUserEntry2" Path="Text.IsEmpty" />
                        <Binding ElementName="txtUserEntry2" Path="IsFocused" />
                    </MultiBinding>
                </TextBlock.Visibility>
            </TextBlock>
            <TextBox Name="txtUserEntry2" Background="Transparent" BorderBrush="{StaticResource brushWatermarkBorder}" />
        </Grid>

    </Grid>

</Window>

TextInputToVisibilityConverter定义为:

using System;
using System.Windows.Data;
using System.Windows;

namespace WaterMarkTextBoxDemo
{
    public class TextInputToVisibilityConverter : IMultiValueConverter
    {
        public object Convert( object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture )
        {
            // Always test MultiValueConverter inputs for non-null
            // (to avoid crash bugs for views in the designer)
            if (values[0] is bool && values[1] is bool)
            {
                bool hasText = !(bool)values[0];
                bool hasFocus = (bool)values[1];

                if (hasFocus || hasText)
                    return Visibility.Collapsed;
            }

            return Visibility.Visible;
        }


        public object[] ConvertBack( object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture )
        {
            throw new NotImplementedException();
        }
    }
}

注意:这不是我的代码。我是在这里找到的，但我认为这是最好的方法。

我已经创建了一个简单的代码实现，它适用于WPF和Silverlight:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;

public class TextBoxWatermarked : TextBox
{
    #region [ Dependency Properties ]

    public static DependencyProperty WatermarkProperty = DependencyProperty.Register
    (
         "Watermark",
         typeof(string),
         typeof(TextBoxWatermarked),
         new PropertyMetadata(new PropertyChangedCallback(OnWatermarkChanged))
    );
    
    #endregion
    
    
    #region [ Fields ]
    
    private bool _isWatermarked;
    private Binding _textBinding;

    #endregion


    #region [ Properties ]

    protected new Brush Foreground
    {
        get { return base.Foreground; }
        set { base.Foreground = value; }
    }

    public string Watermark
    {
        get { return (string)GetValue(WatermarkProperty); }
        set { SetValue(WatermarkProperty, value); }
    }

    #endregion


    #region [ .ctor ]
    
    public TextBoxWatermarked()
    {
        Loaded += (s, ea) => ShowWatermark();
    }
    
    #endregion


    #region [ Event Handlers ]

    protected override void OnGotFocus(RoutedEventArgs e)
    {
        base.OnGotFocus(e);
        HideWatermark();
    }
    
    protected override void OnLostFocus(RoutedEventArgs e)
    {
        base.OnLostFocus(e);
        ShowWatermark();
    }
    
    private static void OnWatermarkChanged(DependencyObject sender, DependencyPropertyChangedEventArgs ea)
    {
        var tbw = sender as TextBoxWatermarked;
        if (tbw == null) return;
        tbw.ShowWatermark();
    }

    #endregion


    #region [ Methods ]

    private void ShowWatermark()
    {
        if (string.IsNullOrEmpty(base.Text))
        {
            _isWatermarked = true;
            base.Foreground = new SolidColorBrush(Colors.Gray);
            var bindingExpression = GetBindingExpression(TextProperty);
            _textBinding = bindingExpression == null ? null : bindingExpression.ParentBinding;
            if (bindingExpression != null)
                bindingExpression.UpdateSource();
            SetBinding(TextProperty, new Binding());
            base.Text = Watermark;
        }
    }

    private void HideWatermark()
    {
        if (_isWatermarked)
        {
            _isWatermarked = false;
            ClearValue(ForegroundProperty);
            base.Text = "";
            SetBinding(TextProperty, _textBinding ?? new Binding());
        }
    }

    #endregion
}

用法:

<TextBoxWatermarked Watermark="Some text" />

这里有一个最简单的解决方案:

            <Grid>
                <Label Content="Placeholder text" VerticalAlignment="Center" Margin="10">
                    <Label.Style>
                        <Style TargetType="Label">
                            <Setter Property="Foreground" Value="Transparent"/>
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding Expression}" Value="">
                                    <Setter Property="Foreground" Value="Gray"/>
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </Label.Style>
                </Label>
                <TextBox HorizontalAlignment="Stretch" Margin="5" Background="Transparent"
                 Text="{Binding Expression, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Center" Padding="5">
                </TextBox>
        </Grid>

这是一个透明背景覆盖标签的文本框。标签的灰色文本通过数据触发器变成透明的，只要绑定的文本不是空字符串就会触发该触发器。

当使用@john-myczek的代码绑定文本框时，我遇到了一些困难。由于TextBox在更新时不会引发焦点事件，水印将在新文本下面保持可见。为了解决这个问题，我简单地添加了另一个事件处理程序:

if (d is ComboBox || d is TextBox)
{
    control.GotKeyboardFocus += Control_GotKeyboardFocus;
    control.LostKeyboardFocus += Control_Loaded;

    if (d is TextBox)
        (d as TextBox).TextChanged += Control_TextChanged;
}


private static void Control_TextChanged(object sender, RoutedEventArgs e)
{
    var tb = (TextBox)sender;
    if (ShouldShowWatermark(tb))
    {
        ShowWatermark(tb);
    }
    else
    {
        RemoveWatermark(tb);
    }
}

只使用XAML，没有扩展，没有转换器:

<Grid>
    <TextBox  Width="250"  VerticalAlignment="Center" HorizontalAlignment="Left" x:Name="SearchTermTextBox" Margin="5"/>
    <TextBlock IsHitTestVisible="False" Text="Enter Search Term Here" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10,0,0,0" Foreground="DarkGray">
        <TextBlock.Style>
            <Style TargetType="{x:Type TextBlock}">
                <Setter Property="Visibility" Value="Collapsed"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding Text, ElementName=SearchTermTextBox}" Value="">
                        <Setter Property="Visibility" Value="Visible"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBlock.Style>
    </TextBlock>
</Grid>

下面是XAML中另一个简单的解决方案:

XAML:

       <TextBox>
            <TextBox.Resources>
                <Style TargetType="TextBox">
                    <Style.Triggers>
                        <Trigger Property="IsFocused" Value="True">
                            <!--text color-->
                            <Setter Property="Foreground" Value="Black"/>
                            <Setter Property="Text" Value=""/>
                        </Trigger>
                        <Trigger Property="IsFocused" Value="False">
                            <!--placeholder color-->
                            <Setter Property="Foreground" Value="Gray"/>
                            <!--placeholder here-->
                            <Setter Property="Text" Value="Placeholder"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Resources>
        </TextBox>