private void Search_Click(object sender, RoutedEventArgs e)//查询定位文本
{
List<TextRange> textRanges = FindWordFromPosition(richTextBox1.Document.ContentStart, txtSearch.Text);
foreach (var range in textRanges)
{
range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Red));
//range.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);
//range.ApplyPropertyValue(TextElement.BackgroundProperty, new SolidColorBrush(Colors.PowderBlue));
}
}
List<TextRange> FindWordFromPosition(TextPointer position, string word)
{
List<TextRange> matchingText = new List<TextRange>();
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
//带有内容的文本
string textRun = position.GetTextInRun(LogicalDirection.Forward);
//查找关键字在这文本中的位置
int indexInRun = textRun.IndexOf(word);
int indexHistory = 0;
while (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun + indexHistory);
TextPointer end = start.GetPositionAtOffset(word.Length);
matchingText.Add(new TextRange(start, end));
indexHistory = indexHistory + indexInRun + word.Length;
textRun = textRun.Substring(indexInRun + word.Length);//去掉已经采集过的内容
indexInRun = textRun.IndexOf(word);//重新判断新的字符串是否还有关键字
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return matchingText;
}