WPF FlowDocumentScrollViewer Selection.Select不工作

Question

我想在我的FlowDocumentScrollViewer中選擇文本。

我能找到TextPointer的開始位置和結束位置。所以我有2個TextPointers ...

TextPointer startPos; 
TextPointer endPos; 

使用這2個TextPointers我試圖在我的FlowDocumentScrollViewer中選擇文本。我正在這樣做...

flowDocumentScrollViewer.Selection.Select(startPos, endPos); 

我希望這會突出顯示選定的文本。但它並沒有這樣做。

爲什麼這不起作用???

[更新] 這是我如何得到TextPointers：

TextPointer pointer = flowDocument.Document.ContentStart; 
while (pointer != null) 
{ 
    if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text) 
    { 
    string textRun = pointer.GetTextInRun(LogicalDirection.Forward); 
    // where textRun is the text in the flowDocument 
    // and searchText is the text that is being searched for 
    int indexInRun = textRun.IndexOf(searchText); 
    if (indexInRun >= 0) 
    { 
     TextPointer startPos = pointer.GetPositionAtOffset(indexInRun); 
     TextPointer endPos = pointer.GetPositionAtOffset(indexInRun + searchText.Length); 
    } 
    } 
    pointer = pointer.GetNextContextPosition(LogicalDirection.Forward); 
} 

Answer 1

我從TextRange.Select方法的MSDN文檔複製下面的代碼，用FlowDocumentScrollViewer取代RichTextBox的，它按預期工作。你是如何定義你的TextPointers的？ 似乎是您的問題最可能的原因。

更新：我更新了我的代碼以包含您的選擇算法，它仍然有效。我知道唯一不同的是選擇後的「休息」。否則，它會從searchText的第一次出現開始直到最後一次出現的結束。除此之外，我可以想象你的searchText可能不會被包含在你的文檔中（可能是一個套管問題？），但這只是猜測。你調試了你的代碼嗎？當您嘗試選擇文本時，TextPointers是否有效（不爲空等）？

XAML：

<FlowDocumentScrollViewer GotMouseCapture="richTB_GotMouseCapture" Name="richTB"> 
    <FlowDocument> 
     <Paragraph Name="myParagraph"> 
      <Run> 
       When the user clicks in the RichTextBox, the selected text changes programmatically. 
      </Run> 
     </Paragraph> 
    </FlowDocument> 
</FlowDocumentScrollViewer> 

代碼：

private void richTB_GotMouseCapture(object sender, MouseEventArgs e) 
{ 
    string searchText = "text"; 
    TextPointer pointer = richTB.Document.ContentStart; 
    while (pointer != null) 
    { 
     if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text) 
     { 
      string textRun = pointer.GetTextInRun(LogicalDirection.Forward); 
      // where textRun is the text in the flowDocument 
      // and searchText is the text that is being searched for 
      int indexInRun = textRun.IndexOf(searchText); 
      if (indexInRun >= 0) 
      { 
       TextPointer startPos = pointer.GetPositionAtOffset(indexInRun); 
       TextPointer endPos = pointer.GetPositionAtOffset(indexInRun + searchText.Length); 
       richTB.Selection.Select(startPos, endPos); 
       break; 
      } 
     } 
     pointer = pointer.GetNextContextPosition(LogicalDirection.Forward); 
    } 
}