Question

我正在为Windows Phone 7构建一个应用程序。我有一个带有几个TextBox的表单。现在我想在我的表单中添加一个占位符，这是我以编程方式创建的。在某些情况下，它可以正常工作，就像我点击TextBox清除占位符一样。但它的作用就像一个价值。文本框不被视为包含Null值。请看一下我的代码：

的Xaml：

<TextBox GotFocus="OnGotFocus" Canvas.Left="6" Canvas.Top="6" Height="74" Name="name" Text="*Name" Width="453" BorderThickness="0"/>
            <TextBox GotFocus="OnGotFocus1" Canvas.Left="6" Canvas.Top="66" Height="74" Name="age" Text="*Age" Width="453" BorderThickness="0" />
            <TextBlock Canvas.Left="20" Canvas.Top="157" Height="44" Name="gen" Text="Gender" Foreground="Black" FontFamily="Verdana" FontSize="24" Width="134" />
            <RadioButton Canvas.Left="139" Canvas.Top="157" FontStyle="Italic" Foreground="Black" Content="Male" Height="71" Name="male" Width="154" />
            <RadioButton Canvas.Left="139" Canvas.Top="207"  FontStyle="Italic" Foreground="Black" Content="Female" Height="71" Name="fem" Width="140" />
            <TextBox GotFocus="OnGotFocus2" Canvas.Left="6" Canvas.Top="267" Height="74" Name="sadd" Text="*Street Address" Width="453" BorderThickness="0"/>
            <TextBox GotFocus="OnGotFocus3" Canvas.Left="6" Canvas.Top="327" Height="74" Name="cadd" Text="*City Address" Width="453" BorderThickness="0"/>
            <TextBox GotFocus="OnGotFocus4" Canvas.Left="6" Canvas.Top="387" Height="74" Name="eadd" Text="*Email Address" Width="453" BorderThickness="0"/>
            <TextBox GotFocus="OnGotFocus5" Canvas.Left="6" Canvas.Top="447" Height="74" Name="phn" Text="*Phone" Width="453" BorderThickness="0"/>
            <TextBox GotFocus="OnGotFocus6" Canvas.Left="6" Canvas.Top="507" Height="74" Name="zip" Text="*Zip Code" Width="453" BorderThickness="0"/>

Cs文件：

private void OnGotFocus(object sender, RoutedEventArgs e)
    {
        if (name.Text.Equals("*Name", StringComparison.OrdinalIgnoreCase))
        {
            name.Text = string.Empty;
        }
    }

    private void OnGotFocus1(object sender, RoutedEventArgs e)
    {
        if (age.Text.Equals("*Age", StringComparison.OrdinalIgnoreCase))
        {
            age.Text = string.Empty;
        }
    }

    private void OnGotFocus2(object sender, RoutedEventArgs e)
    {
        if (sadd.Text.Equals("*Street Address", StringComparison.OrdinalIgnoreCase))
        {
            sadd.Text = string.Empty;
        }
    }

    private void OnGotFocus3(object sender, RoutedEventArgs e)
    {
        if (cadd.Text.Equals("*City Address", StringComparison.OrdinalIgnoreCase))
        {
            cadd.Text = string.Empty;
        }
    }

    private void OnGotFocus4(object sender, RoutedEventArgs e)
    {
        if (eadd.Text.Equals("*Email Address", StringComparison.OrdinalIgnoreCase))
        {
            eadd.Text = string.Empty;
        }
    }

    private void OnGotFocus5(object sender, RoutedEventArgs e)
    {
        if (phn.Text.Equals("Phone", StringComparison.OrdinalIgnoreCase))
        {
            phn.Text = string.Empty;
        }
    }

    private void OnGotFocus6(object sender, RoutedEventArgs e)
    {
        if (zip.Text.Equals("*Zip Code", StringComparison.OrdinalIgnoreCase))
        {
            zip.Text = string.Empty;
        }
    }

我希望占位符不被视为值。请帮忙。

Answer 1

你看过windows toolkit的PhonetextBox，它有一个提示属性。它应该对你有帮助。

Answer 2

此外，您可以使用codeplex提供的水印文本框控件。它会根据您的需要工作

here是链接。

占位符在Windows Phone 7应用程序的文本框中

2 个答案: