RichTextBox：使用带有标签内容的 RichTextBox.Selection.start 等

Question

我希望在选定的文本下划线，但发现下划线继续到下一个选项卡- 停止

示例代码

 //rtbList is a richTextBox
        rtbList.AppendText("\t");  
        selStart = rtbList.TextLength;
        rtbList.AppendText("Bought"); 
        rtbList.SelectionStart = selStart;           
        rtbList.SelectionLength = rtbList.TextLength - selStart;
        rtbList.SelectionFont = hdgFont; // bold & underline
        rtbList.AppendText("\t");
        //
        selStart = rtbList.TextLength;
        rtbList.SelectionLength = 0;
        rtbList.AppendText("Maturity");
        rtbList.SelectionStart = selStart;            
        rtbList.SelectionLength = rtbList.TextLength - selStart;
        rtbList.SelectionFont = hdgFontNoUnderline;

有没有办法克服这个问题，或者它是 rtf 格式的一个基本“缺陷”？

[显然我可以通过使用固定格式来避免这种情况，例如“Courier”和构造字符串

用空格对齐文本。]

Answer 1

看起来您的 selStart 发生在 AppendText("\t") 行之前。您的 NoUnderline 字体不包括包含 Tab 的范围。

基本上，您在下划线字体之后附加的任何文本都会使用该字体，直到您更改它。

rtbList.AppendText("\t");  
selStart = rtbList.TextLength;
rtbList.AppendText("Bought"); 
rtbList.SelectionStart = selStart;           
rtbList.SelectionLength = rtbList.TextLength - selStart;
rtbList.SelectionFont = hdgFont; // bold & underline

//Move before AppendText:
selStart = rtbList.TextLength;

rtbList.AppendText("\t");
rtbList.SelectionLength = 0;
rtbList.AppendText("Maturity");
rtbList.SelectionStart = selStart;            
rtbList.SelectionLength = rtbList.TextLength - selStart;
rtbList.SelectionFont = hdgFontNoUnderline;