如何在Visual C＃中顯示下標？

Question

我正在爲我的A級計算項目製作一個彈丸運動模擬程序，我需要使用帶有下標的物理符號。我不知道如何在標籤或富文本框中使用它。 任何人都可以請給我幫助/代碼來實現這個？

Answer 1

您需要使用RichTextBox中的SelectionCharOffset屬性來完成此操作。

對標，使號碼負，這樣的：

richTextBox1.SelectionCharOffset = -10; 

Answer 2

SelectioncharOffset是不是你最好的選擇。是更好地操作rtf並添加下標標籤。

//This allows you to reselect the text in the rtb after formatting 
      int SelectionStart = richTextBox1.SelectionStart; 
      int SelectionLength = richTextBox1.SelectionLength; 

      string selectedRtf = richTextBox1.SelectedRtf; 
      int Start; 
      int End; 
      string pre; 
      string Mid; 
      string post; 

      //remove superscript from selected text 
      Start = selectedRtf.IndexOf("\\super"); 
      while (Start != -1) 
      { 
       pre = selectedRtf.Substring(0, Start); 
       post = selectedRtf.Substring(Start + 6, selectedRtf.Length - (Start + 6)); 
       selectedRtf = pre.Trim() + post.Trim(); 
       Start = selectedRtf.IndexOf("\\super"); 
      } 

      //if selected text does not contain subscript 
      if (selectedRtf.IndexOf("\\sub") == -1 && selectedRtf.IndexOf("\\nosupersub") == -1) 
      { 
       Start = selectedRtf.IndexOf("}}") + 2; 
       End = selectedRtf.IndexOf("}", Start); 
       pre = selectedRtf.Substring(0, Start); 
       Mid = selectedRtf.Substring(Start, End - Start); 
       post = selectedRtf.Substring(End, selectedRtf.Length - End); 
       selectedRtf = pre + "\\sub" + Mid + "\\nosupersub" + post; 
       goto Clean; 
      } 
      //if selected text contains subscript 
      if (selectedRtf.IndexOf("\\sub") > 0) 
      { 
       Start = selectedRtf.IndexOf("\\sub"); 
       while (Start != -1) 
       { 
        pre = selectedRtf.Substring(0, Start); 
        post = selectedRtf.Substring(Start + 4, selectedRtf.Length - (Start + 4)); 
        selectedRtf = pre.Trim() + post.Trim(); 
        Start = selectedRtf.IndexOf("\\sub"); 

       } 
       goto Clean; 
      } 


     Clean: 
      richTextBox1.SelectedRtf = selectedRtf; 
      richTextBox1.Focus(); 
      richTextBox1.SelectionStart = SelectionStart; 
      richTextBox1.SelectionLength = SelectionLength;