設置多個textbox.SelectionStart值，突出顯示搜索詞

Question

將文本文件導入我的Windows窗體應用程序富文本框後，現在我想要添加搜索功能。是否有可能有多個SelectionStart值？ SelectionLength將會看到相同的單詞。

 string textfield = TextField.Text; 
     string searchword = searchbox.Text; 
     int found=0; 
     TextField.SelectionLength = searchword.Length; 
     TextField.SelectionBackColor = Color.LightBlue; 

     for (int y = 0; y < textfield.Length; y++)//Goes through whole string 
     { 
      if (searchword[0] == textfield[y])//Looks for first character 
      { 
       for (int x = 0; x < searchword.Length; x++)//Checks if rest of characters match 
       { 
        if (searchword[x] == textfield[y + x]) 
        { 
         found++; 
        } 
        else 
         break; 
       } 
      } 

      if (found == searchword.Length) 
      { 
       TextField.SelectionStart = y;//////Want to have multiple of these 
      } 
      found=0; 
     } 
     TextField.Focus(); 

Answer 1

不，你不能。但是，例如，您可以更改所選文字的背景顏色。首先選擇一個詞。然後做這個

foreach (Match match in matches) { 
    richTextBox.SelectionStart = match.Index; 
    richTextBox.SelectionLength = match.Length; 
    richTextBox.SelectionBackColor = Colors.Yellow; 
} 

要清除所有標記，只需選擇整個文本並設置背景色爲白色（假設你沒有使用背顏色以其他方式）。

在示例中，我假設您使用的是Regex。你會發現的話：

string pattern = String.Format(@"\b{0}\b", Regex.Escape(wordToFind)); 
MatchCollection matches = Regex.Matches(richTextBox.Text, pattern);