C# 如何在 RichTextBox 中查找 TextRange（在两个 TextPointers 之间）
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How to find a TextRange in RichTextBox (between two TextPointers)
提问by paradisontheitroad
In my System.Windows.Controls.RichTextBox, I would like to find a TextRange of a given word. However, it is not giving me the correct PositionAtOffset after the first found word. The first one is correct, and then for the next found words, the position is not correct. Am I using the correct methods?
在我的 System.Windows.Controls.RichTextBox 中，我想找到给定单词的 TextRange。但是，在第一个找到的词之后，它没有给我正确的 PositionAtOffset。第一个是正确的，然后对于下一个找到的单词，位置不正确。我是否使用了正确的方法？
Loop through listOfWords
循环遍历listOfWords
Word= listOfWords[j].ToString();
startPos = new TextRange(transcriberArea.Document.ContentStart, transcriberArea.Document.ContentEnd).Text.IndexOf(Word.Trim());
leftPointer = textPointer.GetPositionAtOffset(startPos + 1, LogicalDirection.Forward);
rightPointer = textPointer.GetPositionAtOffset((startPos + 1 + Word.Length), LogicalDirection.Backward);
TextRange myRange= new TextRange(leftPointer, rightPointer);
采纳答案by Bryce Kahle
This code adapted from a sample at MSDNwill find words in from a specified position.
此代码改编自MSDN 上的示例，将从指定位置查找单词。
TextRange FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
return new TextRange(start, end);
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
// position will be null if "word" is not found.
return null;
}
You can then use it like so:
然后你可以像这样使用它：
string[] listOfWords = new string[] { "Word", "Text", "Etc", };
for (int j = 0; j < listOfWords.Length; j++)
{
string Word = listOfWords[j].ToString();
TextRange myRange = FindWordFromPosition(x_RichBox.Document.ContentStart, Word);
}
回答by Lukasz Wasilewski
I think, it should work also.
我认为，它也应该起作用。
It is like "find next" any item from the list.
这就像“查找下一个”列表中的任何项目。
TextPointer FindWordsFromPosition(TextPointer position, IList<string> words)
{
var firstPosition = position;
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
var indexesInRun = new List<int>();
foreach (var word in words)
{
var index = textRun.IndexOf(word);
if (index == 0)
index = textRun.IndexOf(word, 1);
indexesInRun.Add(index);
}
indexesInRun = indexesInRun.Where(i => i != 0 && i != -1).OrderBy(i => i).ToList();
if (indexesInRun.Any())
{
position = position.GetPositionAtOffset(indexesInRun.First());
break;
}
return firstPosition;
}
else
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return position;
}
