我的解决办法很简单。

在我的登录窗口。xaml是这样的。

 <DockPanel HorizontalAlignment="Center" VerticalAlignment="Center" Height="80" Width="300" LastChildFill="True">
        <Button Margin="5,0,0,0" Click="login_Click" DockPanel.Dock="Right"  VerticalAlignment="Center" ToolTip="Login to system">
            Login
        </Button>
        <StackPanel>
            <TextBox x:Name="userNameWatermarked" Height="25" Foreground="Gray" Text="UserName" GotFocus="userNameWatermarked_GotFocus"></TextBox>
            <TextBox x:Name="userName" Height="25"  TextChanged="loginElement_TextChanged" Visibility="Collapsed" LostFocus="userName_LostFocus" ></TextBox>
            <TextBox x:Name="passwordWatermarked" Height="25" Foreground="Gray" Text="Password"  Margin="0,5,0,5" GotFocus="passwordWatermarked_GotFocus"></TextBox>
            <PasswordBox x:Name="password" Height="25" PasswordChanged="password_PasswordChanged" KeyUp="password_KeyUp" LostFocus="password_LostFocus" Margin="0,5,0,5" Visibility="Collapsed"></PasswordBox>
            <TextBlock x:Name="loginError" Visibility="Hidden" Foreground="Red" FontSize="12"></TextBlock>
        </StackPanel>
    </DockPanel>

代码是这样的。

private void userNameWatermarked_GotFocus(object sender, RoutedEventArgs e)
    {
        userNameWatermarked.Visibility = System.Windows.Visibility.Collapsed;
        userName.Visibility = System.Windows.Visibility.Visible;
        userName.Focus();
    }

    private void userName_LostFocus(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(this.userName.Text))
        {
            userName.Visibility = System.Windows.Visibility.Collapsed;
            userNameWatermarked.Visibility = System.Windows.Visibility.Visible;
        }
    }

    private void passwordWatermarked_GotFocus(object sender, RoutedEventArgs e)
    {
        passwordWatermarked.Visibility = System.Windows.Visibility.Collapsed;
        password.Visibility = System.Windows.Visibility.Visible;
        password.Focus();
    }

    private void password_LostFocus(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(this.password.Password))
        {
            password.Visibility = System.Windows.Visibility.Collapsed;
            passwordWatermarked.Visibility = System.Windows.Visibility.Visible;
        }
    }

仅仅决定隐藏或显示水印文本框就足够了。虽然不漂亮，但工作得很好。

CodeProject上有一篇关于如何在“3行XAML”中做到这一点的文章。

<Grid Background="{StaticResource brushWatermarkBackground}">
  <TextBlock Margin="5,2" Text="Type something..."
             Foreground="{StaticResource brushForeground}"
             Visibility="{Binding ElementName=txtUserEntry, Path=Text.IsEmpty,
                          Converter={StaticResource BooleanToVisibilityConverter}}" />
  <TextBox Name="txtUserEntry" Background="Transparent"
           BorderBrush="{StaticResource brushBorder}" />
</Grid>

好吧，它可能不是3行XAML格式的，但它非常简单。

需要注意的一点是:文本上的IsEmpty属性不是string的属性，而是ICollectionView的属性，并且可以显式地设置为Path=Text.(componentModel:ICollectionView.IsEmpty) (with xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase")。这里有详细的解释。

下面是我的方法是伟大的MVVM，在那里我也检查文本框是否有焦点，你也可以使用一个常规的触发器只是文本值以及重点是，当值改变时，我只是改变背景图像:

                    <TextBox.Style>
                        <Style TargetType="TextBox">

                            <Style.Triggers>
                                <MultiTrigger>
                                    <MultiTrigger.Conditions>
                                        <Condition Property="IsFocused" Value="True"/>
                                        <Condition Property="Text" Value=""/>
                                    </MultiTrigger.Conditions>
                                    <MultiTrigger.Setters>
                                        <Setter Property="Background">
                                            <Setter.Value>
                                                <ImageBrush ImageSource="/Images/Scan.PNG" Stretch="Uniform" AlignmentX="Left"/>
                                            </Setter.Value>
                                        </Setter>
                                    </MultiTrigger.Setters>
                                </MultiTrigger>

                            </Style.Triggers>
                        </Style>
                    </TextBox.Style>
                </TextBox>

MahApps。Metro for WPF有一个内置的水印控制，如果你不想自己滚动。使用起来相当简单。

 <AdornerDecorator>
            <TextBox Name="txtSomeText"
                     Width="200"
                     HorizontalAlignment="Right">
                <Controls:TextBoxHelper.Watermark>I'm a watermark!</Controls:TextBoxHelper.Watermark>
            </TextBox>
        </AdornerDecorator>

<TextBox x:Name="OrderTxt" HorizontalAlignment="Left" VerticalAlignment="Top" VerticalContentAlignment="Center" Margin="10,10,0,0" Width="188" Height="32"/>

<Label IsHitTestVisible="False" Content="Order number" DataContext="{Binding ElementName=OrderTxt}" Foreground="DarkGray">
    <Label.Style>
        <Style TargetType="{x:Type Label}">
            <Setter Property="Visibility" Value="Collapsed"/>
            <Setter Property="Width" Value="{Binding Width}"/>
            <Setter Property="Height" Value="{Binding Height}"/>
            <Setter Property="Margin" Value="{Binding Margin}"/>
            <Setter Property="VerticalAlignment" Value="{Binding VerticalAlignment}"/>
            <Setter Property="HorizontalAlignment" Value="{Binding HorizontalAlignment}"/>
            <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment}"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Text}" Value="">
                    <Setter Property="Visibility" Value="Visible"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Label.Style>
</Label>

@Veton -我真的很喜欢你的解决方案的简单性，但我的声誉还没有高到足以撞到你。

@Tim Murphy -“双向绑定需要Path或XPath”的错误很容易修复…更新的代码，包括一些其他的小调整(仅WPF测试):

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

public class TextBoxWatermarked : TextBox
{
  public string Watermark
  {
    get { return (string)GetValue(WaterMarkProperty); }
    set { SetValue(WaterMarkProperty, value); }
  }
  public static readonly DependencyProperty WaterMarkProperty =
      DependencyProperty.Register("Watermark", typeof(string), typeof(TextBoxWatermarked), new PropertyMetadata(new PropertyChangedCallback(OnWatermarkChanged)));

  private bool _isWatermarked = false;
  private Binding _textBinding = null;

  public TextBoxWatermarked()
  {
    Loaded += (s, ea) => ShowWatermark();
  }

  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 || !tbw.IsLoaded) return; //needed to check IsLoaded so that we didn't dive into the ShowWatermark() routine before initial Bindings had been made
    tbw.ShowWatermark();
  }

  private void ShowWatermark()
  {
    if (String.IsNullOrEmpty(Text) && !String.IsNullOrEmpty(Watermark))
    {
      _isWatermarked = true;

      //save the existing binding so it can be restored
      _textBinding = BindingOperations.GetBinding(this, TextProperty);

      //blank out the existing binding so we can throw in our Watermark
      BindingOperations.ClearBinding(this, TextProperty);

      //set the signature watermark gray
      Foreground = new SolidColorBrush(Colors.Gray);

      //display our watermark text
      Text = Watermark;
    }
  }

  private void HideWatermark()
  {
    if (_isWatermarked)
    {
      _isWatermarked = false;
      ClearValue(ForegroundProperty);
      Text = "";
      if (_textBinding != null) SetBinding(TextProperty, _textBinding);
    }
  }

}