WPF實現搜索文本高亮

1、使用自定義的TextBlock

public class HighlightTextblock : TextBlock{public string DefaultText { get; set; }public string HiText{get { return (string)GetValue(HiTextProperty); }set { SetValue(HiTextProperty, value); }}// Using a DependencyProperty as the backing store for HiText.  This enables animation, styling, binding, etc...public static readonly DependencyProperty HiTextProperty =DependencyProperty.Register("HiText", typeof(string), typeof(HighlightTextblock), new PropertyMetadata(string.Empty, OnHiTextChanged));private static void OnHiTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){HighlightTextblock block = d as HighlightTextblock;block.UpdateHighText(e.NewValue?.ToString());}private void UpdateHighText(string hiText){if (string.IsNullOrEmpty(DefaultText) || DefaultText != Text){DefaultText = Text;}if (!string.IsNullOrEmpty(hiText)){Text = string.Empty;string[] spli = Regex.Split(DefaultText, hiText, RegexOptions.IgnoreCase);for (int i = 0; i < spli.Length; i++){Inlines.Add(new Run(spli[i]));if (i < spli.Length - 1){int searchstart = Text.Length;var iCaseTextIndex = DefaultText.IndexOf(hiText, searchstart, StringComparison.OrdinalIgnoreCase);if (iCaseTextIndex < 0){continue;}string caseText = DefaultText.Substring(iCaseTextIndex, hiText.Length);Inlines.Add(new Run(caseText) { Background = Brushes.Yellow });}}}else{Text = DefaultText;}}}

2、界面中引用上述自定義控件

xmlns:local="clr-namespace:命名空間;assembly=包名"

3、使用高亮控件

<local:HighlightTextblock   Text="{Binding 完整文本}" HiText="{Binding 要高亮的部分，例如搜索框的內容}"/>