blocks|key|564935|text|对于WPF来说，没有办法。你必须模仿它。See+this+example。第二种(不稳定的解决方案)是承载一个从TextBox继承的WinForms用户控件，并将EM_SETCUEBANNER消息发送到编辑控件。即。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|564936|[DllImport("user32.dll",+CharSet+=+CharSet.Auto)]
private+static+extern+IntPtr+SendMessage(IntPtr+hWnd,+Int32+msg,+IntPtr+wParam,+IntPtr+lParam);

private+const+Int32+ECM_FIRST+=+0x1500;
private+const+Int32+EM_SETCUEBANNER+=+ECM_FIRST+%2B+1;

private+void+SetCueText(IntPtr+handle,+string+cueText)+{
++++SendMessage(handle,+EM_SETCUEBANNER,+IntPtr.Zero,+Marshal.StringToBSTR(cueText));
}

public+string+CueText+{
++++get+{
++++++++return+m_CueText;
++++}+
++++set+{
++++++++m_CueText+=+value;
++++++++SetCueText(this.Handle,+m_CueText);
}|code-block|syntax|javascript|564937|另外，如果你想托管一个WinForm控制方法，我有一个框架，它已经包含了这个实现，叫做BitFlex框架，你可以download+for+free+here它。|564938|如果您想了解更多信息，请使用Here+is+an+article关于BitFlex。您将会发现，如果您正在寻找Windows+Explorer样式的控件，这通常不会现成的，并且因为WPF通常不能与句柄一起工作，所以您不能像使用WinForms那样在Win32或现有控件周围编写简单的包装器。|564939|截图：|564940|📷|atomic|564941|​|564942|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/thinkpixellab/bot/blob/master/Wpf/InfoTextBox.cs|1|http://www.dcomproductions.com/products/bitflex/|2|http://www.dcomproductions.com/blog/2011/08/bitflex-framework-released-to-the-public-as-part-of-the-open-source-initiative/|3|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/6c17fcbe5b48da58fe8aed206953d029.jpeg|imageAlt^0|K|G|0|0|0|1K|M|1|0|E|I|2|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|D|3|E|5|F|7|1F|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|K|3|L|5|6|7|1K|8|@]|9|@$A|1L|B|1M|1|1N]]|C|$]]|$1|M|3|N|5|6|7|1O|8|@]|9|@]|C|$]]|$1|O|3|P|5|Q|7|1P|8|@]|9|@$A|1Q|B|1R|1|1S]]|C|$]]|$1|R|3|S|5|6|7|1T|8|@]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1U|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]|11|$5|W|X|Y|C|$Z|12]]|13|$5|W|X|Y|C|$Z|14]]|15|$5|16|X|17|C|$18|19|1A|-4]]]]

<p>For WPF, there isn't a way. You have to mimic it. <a href="https://github.com/thinkpixellab/bot/blob/master/Wpf/InfoTextBox.cs" rel="nofollow noreferrer">See this example</a>. A secondary (flaky solution) is to host a WinForms user control that inherits from TextBox and send the EM_SETCUEBANNER message to the edit control. ie.</p>

<pre><code>[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam);

private const Int32 ECM_FIRST = 0x1500;
private const Int32 EM_SETCUEBANNER = ECM_FIRST + 1;

private void SetCueText(IntPtr handle, string cueText) {
    SendMessage(handle, EM_SETCUEBANNER, IntPtr.Zero, Marshal.StringToBSTR(cueText));
}

public string CueText {
    get {
        return m_CueText;
    } 
    set {
        m_CueText = value;
        SetCueText(this.Handle, m_CueText);
}
</code></pre>

<p>Also, if you want to host a WinForm control approach, I have a framework that already includes this implementation called BitFlex Framework, which you can <a href="http://www.dcomproductions.com/products/bitflex/" rel="nofollow noreferrer">download for free here</a>.</p>

<p><a href="http://www.dcomproductions.com/blog/2011/08/bitflex-framework-released-to-the-public-as-part-of-the-open-source-initiative/" rel="nofollow noreferrer">Here is an article</a> about BitFlex if you want more information. You will start to find that if you are looking to have Windows Explorer style controls that this generally never comes out of the box, and because WPF does not work with handles generally you cannot write an easy wrapper around Win32 or an existing control like you can with WinForms.</p>

<p>Screenshot:
<img src="https://i.stack.imgur.com/335y2.jpg" alt="enter image description here"></p>


blocks|key|781337|text|您必须通过继承textbox来创建自定义控件。下面的链接提供了一个关于搜索文本框示例的很好的示例。请看一下这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|781338|http://davidowens.wordpress.com/2009/02/18/wpf-search-text-box/|offset|length|781339|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1R|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

<p>You have to create a custom control by inheriting the textbox.
Below link has an excellent example about the search textbox sample.
Please have a look at this</p>

<p><a href="http://davidowens.wordpress.com/2009/02/18/wpf-search-text-box/" rel="nofollow">http://davidowens.wordpress.com/2009/02/18/wpf-search-text-box/</a></p>


blocks|key|781390|text|在Style中使用VisualBrush和一些触发器可以更轻松地实现这一点|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|781391|<TextBox>
++++<TextBox.Style>
++++++++<Style+TargetType="TextBox"+xmlns:sys="clr-namespace:System;assembly=mscorlib">
++++++++++++<Style.Resources>
++++++++++++++++<VisualBrush+x:Key="CueBannerBrush"+AlignmentX="Left"+AlignmentY="Center"+Stretch="None">
++++++++++++++++++++<VisualBrush.Visual>
++++++++++++++++++++++++<Label+Content="Search"+Foreground="LightGray"+/>
++++++++++++++++++++</VisualBrush.Visual>
++++++++++++++++</VisualBrush>
++++++++++++</Style.Resources>
++++++++++++<Style.Triggers>
++++++++++++++++<Trigger+Property="Text"+Value="{x:Static+sys:String.Empty}">
++++++++++++++++++++<Setter+Property="Background"+Value="{StaticResource+CueBannerBrush}"+/>
++++++++++++++++</Trigger>
++++++++++++++++<Trigger+Property="Text"+Value="{x:Null}">
++++++++++++++++++++<Setter+Property="Background"+Value="{StaticResource+CueBannerBrush}"+/>
++++++++++++++++</Trigger>
++++++++++++++++<Trigger+Property="IsKeyboardFocused"+Value="True">
++++++++++++++++++++<Setter+Property="Background"+Value="White"+/>
++++++++++++++++</Trigger>
++++++++++++</Style.Triggers>
++++++++</Style>
++++</TextBox.Style>
</TextBox>|code-block|syntax|javascript|781392|要提高此Style的可重用性，您还可以创建一组附加属性来控制实际的提示横幅文本、颜色、方向等。|781393|entityMap^0|1|5|9|B|0|0|4|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

<p>You can accomplish this much more easily with a <code>VisualBrush</code> and some triggers in a <code>Style</code>:</p>

<pre><code>&lt;TextBox&gt;
    &lt;TextBox.Style&gt;
        &lt;Style TargetType="TextBox" xmlns:sys="clr-namespace:System;assembly=mscorlib"&gt;
            &lt;Style.Resources&gt;
                &lt;VisualBrush x:Key="CueBannerBrush" AlignmentX="Left" AlignmentY="Center" Stretch="None"&gt;
                    &lt;VisualBrush.Visual&gt;
                        &lt;Label Content="Search" Foreground="LightGray" /&gt;
                    &lt;/VisualBrush.Visual&gt;
                &lt;/VisualBrush&gt;
            &lt;/Style.Resources&gt;
            &lt;Style.Triggers&gt;
                &lt;Trigger Property="Text" Value="{x:Static sys:String.Empty}"&gt;
                    &lt;Setter Property="Background" Value="{StaticResource CueBannerBrush}" /&gt;
                &lt;/Trigger&gt;
                &lt;Trigger Property="Text" Value="{x:Null}"&gt;
                    &lt;Setter Property="Background" Value="{StaticResource CueBannerBrush}" /&gt;
                &lt;/Trigger&gt;
                &lt;Trigger Property="IsKeyboardFocused" Value="True"&gt;
                    &lt;Setter Property="Background" Value="White" /&gt;
                &lt;/Trigger&gt;
            &lt;/Style.Triggers&gt;
        &lt;/Style&gt;
    &lt;/TextBox.Style&gt;
&lt;/TextBox&gt;
</code></pre>

<p>To increase the re-usability of this <code>Style</code>, you can also create a set of attached properties to control the actual cue banner text, color, orientation etc.</p>


blocks|key|781429|text|在代码隐藏中执行此操作，方法是将文本颜色初始设置为灰色，并添加用于获得和丢失键盘焦点的事件处理程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|781430|TextBox+tb+=+new+TextBox();
tb.Foreground+=+Brushes.Gray;
tb.Text+=+"Text";
tb.GotKeyboardFocus+%2B=+new+KeyboardFocusChangedEventHandler(tb_GotKeyboardFocus);
tb.LostKeyboardFocus+%2B=+new+KeyboardFocusChangedEventHandler(tb_LostKeyboardFocus);|code-block|syntax|javascript|781431|然后是事件处理程序：|781432|private+void+tb_GotKeyboardFocus(object+sender,+KeyboardFocusChangedEventArgs+e)
{
++++if(sender+is+TextBox)
++++{
++++++++//If+nothing+has+been+entered+yet.
++++++++if(((TextBox)sender).Foreground+==+Brushes.Gray)
++++++++{
++++++++++++((TextBox)sender).Text+=+"";
++++++++++++((TextBox)sender).Foreground+=+Brushes.Black;
++++++++}
++++}
}


private+void+tb_LostKeyboardFocus(object+sender,+KeyboardFocusChangedEventArgs+e)
{
++++//Make+sure+sender+is+the+correct+Control.
++++if(sender+is+TextBox)
++++{
++++++++//If+nothing+was+entered,+reset+default+text.
++++++++if(((TextBox)sender).Text.Trim().Equals(""))
++++++++{
++++++++++++((TextBox)sender).Foreground+=+Brushes.Gray;
++++++++++++((TextBox)sender).Text+=+"Text";
++++++++}
++++}
}|781433|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Do it in the code-behind by setting the text color initially to gray and adding event handlers for gaining and losing keyboard focus.</p>

<pre><code>TextBox tb = new TextBox();
tb.Foreground = Brushes.Gray;
tb.Text = "Text";
tb.GotKeyboardFocus += new KeyboardFocusChangedEventHandler(tb_GotKeyboardFocus);
tb.LostKeyboardFocus += new KeyboardFocusChangedEventHandler(tb_LostKeyboardFocus);
</code></pre>

<p>Then the event handlers:</p>

<pre><code>private void tb_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
    if(sender is TextBox)
    {
        //If nothing has been entered yet.
        if(((TextBox)sender).Foreground == Brushes.Gray)
        {
            ((TextBox)sender).Text = "";
            ((TextBox)sender).Foreground = Brushes.Black;
        }
    }
}


private void tb_LostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
    //Make sure sender is the correct Control.
    if(sender is TextBox)
    {
        //If nothing was entered, reset default text.
        if(((TextBox)sender).Text.Trim().Equals(""))
        {
            ((TextBox)sender).Foreground = Brushes.Gray;
            ((TextBox)sender).Text = "Text";
        }
    }
}
</code></pre>


blocks|key|565090|text|我使用了got和lost+focus事件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565091|Private+Sub+txtSearchBox_GotFocus(ByVal+sender+As+System.Object,+ByVal+e+As+System.Windows.RoutedEventArgs)+Handles+txtSearchBox.GotFocus
++++If+txtSearchBox.Text+=+"Search"+Then
++++++++txtSearchBox.Text+=+""
++++Else

++++End+If

End+Sub

Private+Sub+txtSearchBox_LostFocus(ByVal+sender+As+System.Object,+ByVal+e+As+System.Windows.RoutedEventArgs)+Handles+txtSearchBox.LostFocus
++++If+txtSearchBox.Text+=+""+Then
++++++++txtSearchBox.Text+=+"Search"
++++Else

++++End+If
End+Sub|code-block|syntax|javascript|565092|它运行良好，但文本仍然是灰色的。需要清理一下。我使用的是VB.NET|565093|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>I used the got and lost focus events:</p>

<pre><code>Private Sub txtSearchBox_GotFocus(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles txtSearchBox.GotFocus
    If txtSearchBox.Text = "Search" Then
        txtSearchBox.Text = ""
    Else

    End If

End Sub

Private Sub txtSearchBox_LostFocus(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles txtSearchBox.LostFocus
    If txtSearchBox.Text = "" Then
        txtSearchBox.Text = "Search"
    Else

    End If
End Sub
</code></pre>

<p>It works well, but the text is in gray still. Needs cleaning up. I was using VB.NET</p>


blocks|key|781490|text|这是我的简单解决方案，改编自微软(https://code.msdn.microsoft.com/windowsapps/How-to-add-a-hint-text-to-ed66a3c6)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|781491|++++<Grid+Background="White"+HorizontalAlignment="Right"+VerticalAlignment="Top"++>
++++++++
++++++++<TextBlock+Margin="5,2"+MinWidth="50"+Text="Suche..."+
+++++++++++++++++++Foreground="LightSteelBlue"+Visibility="{Binding+ElementName=txtSearchBox,+Path=Text.IsEmpty,+Converter={StaticResource+MyBoolToVisibilityConverter}}"+IsHitTestVisible="False"/>
++++++++
++++++++<TextBox+MinWidth="50"+Name="txtSearchBox"+Background="Transparent"+/>
++++</Grid>|code-block|syntax|javascript|781492|entityMap|0|LINK|mutability|MUTABLE|url|https://code.msdn.microsoft.com/windowsapps/How-to-add-a-hint-text-to-ed66a3c6^0|H|26|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>This is my simple solution, adapted from Microsoft (<a href="https://code.msdn.microsoft.com/windowsapps/How-to-add-a-hint-text-to-ed66a3c6" rel="noreferrer">https://code.msdn.microsoft.com/windowsapps/How-to-add-a-hint-text-to-ed66a3c6</a>)</p>
<pre><code>    &lt;Grid Background=&quot;White&quot; HorizontalAlignment=&quot;Right&quot; VerticalAlignment=&quot;Top&quot;  &gt;
        &lt;!-- overlay with hint text --&gt;
        &lt;TextBlock Margin=&quot;5,2&quot; MinWidth=&quot;50&quot; Text=&quot;Suche...&quot; 
                   Foreground=&quot;LightSteelBlue&quot; Visibility=&quot;{Binding ElementName=txtSearchBox, Path=Text.IsEmpty, Converter={StaticResource MyBoolToVisibilityConverter}}&quot; IsHitTestVisible=&quot;False&quot;/&gt;
        &lt;!-- enter term here --&gt;
        &lt;TextBox MinWidth=&quot;50&quot; Name=&quot;txtSearchBox&quot; Background=&quot;Transparent&quot; /&gt;
    &lt;/Grid&gt;
</code></pre>


blocks|key|565121|text|++<Grid>
++++<TextBox+Name="myTextBox"/>
++++<TextBlock>
++++++++<TextBlock.Style>
++++++++++++<Style+TargetType="TextBlock">
++++++++++++++++<Style.Triggers>
++++++++++++++++++++<DataTrigger+Binding="{Binding+ElementName=myTextBox,+Path=Text.IsEmpty}"+Value="True">
++++++++++++++++++++++++<Setter+Property="Text"+Value="Prompt..."/>
++++++++++++++++++++</DataTrigger>
++++++++++++++++</Style.Triggers>
++++++++++++</Style>
++++++++</TextBlock.Style>
++++</TextBlock>
</Grid>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|565122|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>  &lt;Grid&gt;
    &lt;TextBox Name="myTextBox"/&gt;
    &lt;TextBlock&gt;
        &lt;TextBlock.Style&gt;
            &lt;Style TargetType="TextBlock"&gt;
                &lt;Style.Triggers&gt;
                    &lt;DataTrigger Binding="{Binding ElementName=myTextBox, Path=Text.IsEmpty}" Value="True"&gt;
                        &lt;Setter Property="Text" Value="Prompt..."/&gt;
                    &lt;/DataTrigger&gt;
                &lt;/Style.Triggers&gt;
            &lt;/Style&gt;
        &lt;/TextBlock.Style&gt;
    &lt;/TextBlock&gt;
&lt;/Grid&gt;
</code></pre>


blocks|key|781542|text|你可以用一种非常简单的方式来做。这个想法是将标签放在与文本框相同的位置。如果textbox没有文本且没有焦点，您的标签将可见。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|781543|+<Label+Name="PalceHolder"++HorizontalAlignment="Left"+HorizontalContentAlignment="Center"+VerticalContentAlignment="Center"+Height="40"+VerticalAlignment="Top"+Width="239"+FontStyle="Italic"++Foreground="BurlyWood">PlaceHolder+Text+Here
++<Label.Style>
++++<Style+TargetType="{x:Type+Label}">
++++++<Setter+Property="Visibility"+Value="Hidden"/>
++++++<Style.Triggers>
++++++++<MultiDataTrigger>
++++++++++<MultiDataTrigger.Conditions>
++++++++++++<Condition+Binding+="{Binding+ElementName=PalceHolder,+Path=Text.Length}"+Value="0"/>
++++++++++++<Condition+Binding+="{Binding+ElementName=PalceHolder,+Path=IsFocused}"+Value="False"/>
++++++++++</MultiDataTrigger.Conditions>
++++++++++<Setter+Property="Visibility"+Value="Visible"/>
++++++++</MultiDataTrigger>
++++++</Style.Triggers>
++++</Style>
++</Label.Style>
</Label>
<TextBox++Background="Transparent"+Name="TextBox1"+HorizontalAlignment="Left"+HorizontalContentAlignment="Center"+VerticalContentAlignment="Center"+Height="40"TextWrapping="Wrap"+Text="{Binding+InputText,Mode=TwoWay}"+VerticalAlignment="Top"+Width="239"+/>|code-block|syntax|javascript|781544|额外的好处:如果你想要你的文本的默认值，在提交数据时一定要设置它(例如：“InputText”=“PlaceHolder+textBox+Here”，如果为空)。|781545|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>You can do in a very simple way.
 The idea is to place a Label in the same place as your textbox. Your Label will be visible if textbox has no text and hasn't the focus.</p>

<pre><code> &lt;Label Name="PalceHolder"  HorizontalAlignment="Left" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Height="40" VerticalAlignment="Top" Width="239" FontStyle="Italic"  Foreground="BurlyWood"&gt;PlaceHolder Text Here
  &lt;Label.Style&gt;
    &lt;Style TargetType="{x:Type Label}"&gt;
      &lt;Setter Property="Visibility" Value="Hidden"/&gt;
      &lt;Style.Triggers&gt;
        &lt;MultiDataTrigger&gt;
          &lt;MultiDataTrigger.Conditions&gt;
            &lt;Condition Binding ="{Binding ElementName=PalceHolder, Path=Text.Length}" Value="0"/&gt;
            &lt;Condition Binding ="{Binding ElementName=PalceHolder, Path=IsFocused}" Value="False"/&gt;
          &lt;/MultiDataTrigger.Conditions&gt;
          &lt;Setter Property="Visibility" Value="Visible"/&gt;
        &lt;/MultiDataTrigger&gt;
      &lt;/Style.Triggers&gt;
    &lt;/Style&gt;
  &lt;/Label.Style&gt;
&lt;/Label&gt;
&lt;TextBox  Background="Transparent" Name="TextBox1" HorizontalAlignment="Left" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Height="40"TextWrapping="Wrap" Text="{Binding InputText,Mode=TwoWay}" VerticalAlignment="Top" Width="239" /&gt;
</code></pre>

<p>Bonus:If you want to have default value for your textBox, be sure after to set it when submitting data (for example:"InputText"="PlaceHolder Text Here" if empty).</p>


blocks|key|565192|text|另一种解决方案是使用像MahApps.Metro这样的WPF工具包。它有很多不错的功能，比如文本框水印：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565193|Controls:TextBoxHelper.Watermark="Search..."|offset|length|style|CODE|565194|请参阅http://mahapps.com/controls/textbox.html|565195|entityMap|0|LINK|mutability|MUTABLE|url|http://mahapps.com/controls/textbox.html^0|0|0|18|0|3|14|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

<p>Another solution is to use a WPF toolkit like MahApps.Metro. It has many nice features, like a text box watermark:</p>

<p><code>Controls:TextBoxHelper.Watermark="Search..."</code></p>

<p>See <a href="http://mahapps.com/controls/textbox.html" rel="nofollow noreferrer">http://mahapps.com/controls/textbox.html</a></p>


blocks|key|565241|text|使用materialDesign+HintAssist怎么样？我正在使用这个，你也可以添加浮动提示：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|565242|<TextBox+Width="150"+Height="40"+Text="hello"+materialDesign:HintAssist.Hint="address"++materialDesign:HintAssist.IsFloating="True"></TextBox>|code-block|syntax|javascript|565243|我使用Nuget包安装了Material+Design在documentation链接中有安装指南|565244|entityMap|0|LINK|mutability|MUTABLE|url|http://materialdesigninxaml.net/|1|https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/wiki/Getting-Started^0|2|E|0|0|0|S|D|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

<p>what about using <a href="http://materialdesigninxaml.net/" rel="noreferrer">materialDesign</a> HintAssist ? i'm using this which also you can add floating hint too :</p>

<pre><code>&lt;TextBox Width="150" Height="40" Text="hello" materialDesign:HintAssist.Hint="address"  materialDesign:HintAssist.IsFloating="True"&gt;&lt;/TextBox&gt;
</code></pre>

<p>i installed Material Design with Nuget Package there is installation guide in <a href="https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/wiki/Getting-Started" rel="noreferrer">documentation</a> link</p>


blocks|key|781649|text|这是我的观点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|781650|<ControlTemplate>
++++<Grid>
++++++++<Grid.Resources>
++++++++++++
++++++++++++<Style+TargetType="TextBox">
++++++++++++++++<Setter+Property="Padding"+Value="4"/>
++++++++++++++++<Setter+Property="BorderThickness"+Value="2"/>
++++++++++++</Style>
++++++++</Grid.Resources>

++++++++<TextBox+x:Name="TbSearch"/>
++++++++<TextBox+x:Name="TbHint"+Text="Suche"+Foreground="LightGray"
+++++++++++++++++Visibility="Hidden"+IsHitTestVisible="False"+Focusable="False"/>
++++</Grid>

++++<ControlTemplate.Triggers>
++++++++<MultiTrigger>
++++++++++++<MultiTrigger.Conditions>
++++++++++++++++<Condition+SourceName="TbSearch"+Property="Text"+Value="{x:Static+sys:String.Empty}"/>
++++++++++++++++<Condition+SourceName="TbSearch"+Property="IsKeyboardFocused"+Value="False"/>
++++++++++++</MultiTrigger.Conditions>
++++++++++++<MultiTrigger.Setters>
++++++++++++++++<Setter+TargetName="TbHint"+Property="Visibility"+Value="Visible"/>
++++++++++++</MultiTrigger.Setters>
++++++++</MultiTrigger>

++++++++<MultiTrigger>
++++++++++++<MultiTrigger.Conditions>
++++++++++++++++<Condition+SourceName="TbSearch"+Property="Text"+Value="{x:Null}"/>
++++++++++++++++<Condition+SourceName="TbSearch"+Property="IsKeyboardFocused"+Value="False"/>
++++++++++++</MultiTrigger.Conditions>
++++++++++++<MultiTrigger.Setters>
++++++++++++++++<Setter+TargetName="TbHint"+Property="Visibility"+Value="Visible"/>
++++++++++++</MultiTrigger.Setters>
++++++++</MultiTrigger>
++++</ControlTemplate.Triggers>
</ControlTemplate>|code-block|syntax|javascript|781651|在我看来，大多数其他答案，包括顶部的答案，都有缺陷。|781652|这个解决方案在任何情况下都有效。纯XAML，易于重用。|781653|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>That's my take:</p>
<pre><code>&lt;ControlTemplate&gt;
    &lt;Grid&gt;
        &lt;Grid.Resources&gt;
            &lt;!--Define look / layout for both TextBoxes here. I applied custom Padding and BorderThickness for my application--&gt;
            &lt;Style TargetType=&quot;TextBox&quot;&gt;
                &lt;Setter Property=&quot;Padding&quot; Value=&quot;4&quot;/&gt;
                &lt;Setter Property=&quot;BorderThickness&quot; Value=&quot;2&quot;/&gt;
            &lt;/Style&gt;
        &lt;/Grid.Resources&gt;

        &lt;TextBox x:Name=&quot;TbSearch&quot;/&gt;
        &lt;TextBox x:Name=&quot;TbHint&quot; Text=&quot;Suche&quot; Foreground=&quot;LightGray&quot;
                 Visibility=&quot;Hidden&quot; IsHitTestVisible=&quot;False&quot; Focusable=&quot;False&quot;/&gt;
    &lt;/Grid&gt;

    &lt;ControlTemplate.Triggers&gt;
        &lt;MultiTrigger&gt;
            &lt;MultiTrigger.Conditions&gt;
                &lt;Condition SourceName=&quot;TbSearch&quot; Property=&quot;Text&quot; Value=&quot;{x:Static sys:String.Empty}&quot;/&gt;
                &lt;Condition SourceName=&quot;TbSearch&quot; Property=&quot;IsKeyboardFocused&quot; Value=&quot;False&quot;/&gt;
            &lt;/MultiTrigger.Conditions&gt;
            &lt;MultiTrigger.Setters&gt;
                &lt;Setter TargetName=&quot;TbHint&quot; Property=&quot;Visibility&quot; Value=&quot;Visible&quot;/&gt;
            &lt;/MultiTrigger.Setters&gt;
        &lt;/MultiTrigger&gt;

        &lt;MultiTrigger&gt;
            &lt;MultiTrigger.Conditions&gt;
                &lt;Condition SourceName=&quot;TbSearch&quot; Property=&quot;Text&quot; Value=&quot;{x:Null}&quot;/&gt;
                &lt;Condition SourceName=&quot;TbSearch&quot; Property=&quot;IsKeyboardFocused&quot; Value=&quot;False&quot;/&gt;
            &lt;/MultiTrigger.Conditions&gt;
            &lt;MultiTrigger.Setters&gt;
                &lt;Setter TargetName=&quot;TbHint&quot; Property=&quot;Visibility&quot; Value=&quot;Visible&quot;/&gt;
            &lt;/MultiTrigger.Setters&gt;
        &lt;/MultiTrigger&gt;
    &lt;/ControlTemplate.Triggers&gt;
&lt;/ControlTemplate&gt;
</code></pre>
<p>Most other answers including the top one have flaws in my opinion.</p>
<p>This solution works under all circumstances. Pure XAML, easily reusable.</p>


<p>For example, Facebook has a "Search" hint text in the Search text box when the textbox is empty. </p>

<p>How to achieve this with WPF text boxes??</p>

<p><img src="https://i.stack.imgur.com/IUIK4.png" alt="Facebook&#39;s search textbox"></p>


How can I add a hint text to WPF textbox?

Windows

例如，当文本框为空时，Facebook会在搜索文本框中显示“搜索”提示文本。如何在WPF文本框中实现这一点？​​

问如何将提示文本添加到WPF文本框？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何将提示文本添加到WPF文本框？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何将提示文本添加到WPF文本框？
EN