TextBlock Windows Phone 8.1 中的文本格式

问题描述：

我的 ViewModel 中有一个字符串列表，格式如下:

I have a list of strings in my ViewModel with the following format:

 This is an <b>example.<b>

我想在我的视图中使用某种文本控件，通过 DataBinding* 显示格式化文本，如下所示:

I want to have some kind of text control in my view that will display the formatted text via DataBinding*, like this:

这是一个示例.

我没有找到任何可以像这样运行的内置控件.

I don't find any built-in control that can behave like this.

有人知道怎么处理吗?

答

您可以使用运行:

<TextBlock FontSize="30">
    <Run>This is an</Run>
    <Run FontWeight="Bold" Text=" example"/>
</TextBlock>

为此，您必须解析字符串，选择粗体部分，并在后面的代码中定义内容.一个非常简单的示例如下所示:

For this you will have to parse your strings, select bold sections, and define content in the code behind. A very simple example can look like this:

string example = @"This is an <b>example.</b>";
var str = example.Split(new string[] { "<b>", "</b>" }, StringSplitOptions.None);
for (int i = 0; i < str.Length; i++)
    myTextBlock.Inlines.Add(new Run { Text = str[i], FontWeight = i % 2 == 1 ? FontWeights.Bold : FontWeights.Normal });

编辑 - 与绑定一起使用

如果你想把上面的过程和 Binding 一起使用，那就没那么简单了——TextBlock.Inlines 不是一个 DependencyProperty，所以我们不能使用它.然而，有一种方法可以做到这一点 - 您需要以某种方式扩展您的 TextBlock - 这是另一个陷阱 - 它是密封类，因此没有继承.在这种情况下，我们将不得不使用另一个类(这里也是一个很好的例子):

If you want to use the above procedure with Binding, then it's not so simple - TextBlock.Inlines is not a DependencyProperty, so we cannot use it. Nevertheless there is a way to do it - you need to extend somehow your TextBlock - here is another pitfall - it's sealed class so no inheritance. In this case we will have to use another class (here is also a good example):

public static class TextBlockExtension
{
    public static string GetFormattedText(DependencyObject obj)
    { return (string)obj.GetValue(FormattedTextProperty); }

    public static void SetFormattedText(DependencyObject obj, string value)
    { obj.SetValue(FormattedTextProperty, value); }

    public static readonly DependencyProperty FormattedTextProperty =
        DependencyProperty.Register("FormattedText", typeof(string), typeof(TextBlockExtension),
        new PropertyMetadata(string.Empty, (sender, e) =>
        {
            string text = e.NewValue as string;
            var textBl = sender as TextBlock;
            if (textBl != null)
            {
                textBl.Inlines.Clear();
                var str = text.Split(new string[] { "<b>", "</b>" }, StringSplitOptions.None);
                for (int i = 0; i < str.Length; i++)
                    textBl.Inlines.Add(new Run { Text = str[i], FontWeight = i % 2 == 1 ? FontWeights.Bold : FontWeights.Normal });
            }
        }));
}

然后你可以像这样在 xaml 中使用它:

Then you can use it in xaml like this:

<TextBlock local:TextBlockExtension.FormattedText="{Binding MyText}"/>

TextBlock Windows Phone 8.1 中的文本格式

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