Question

如何在RichTextBox中以＃开头的行上色，就像python中的注释一样。我有这段代码，但它应该只对其中＃号行进行着色。我的代码在写了一个＃之后会为所有内容着色：

private void richTextBox1_TextChanged(object sender, EventArgs e)
{
  string text = richTextBox1.Text;
  if (richTextBox1.Lines.Contains("#") == true)
  {
    int firstcharindex = richTextBox1.GetFirstCharIndexOfCurrentLine();
    int currentline = richTextBox1.GetLineFromCharIndex(firstcharindex);
    richTextBox1.Select(firstcharindex, 10);
    richTextBox1.SelectionColor = Color.Red;
    richTextBox1.DeselectAll();
    richTextBox1.Select(richTextBox1.Text.Length, 0);
  }
}

Answer 1

您错过了else条件，也对TexBox中的每一行都进行了如下操作

string text = richTextBox1.Text;
foreach (var line in richTextBox1.Lines)
{
  if (line.Contains("#"))
  {
    int firstcharindex = richTextBox1.GetFirstCharIndexOfCurrentLine();
    int currentline = richTextBox1.GetLineFromCharIndex(firstcharindex);
    richTextBox1.Select(firstcharindex, 10);
    richTextBox1.SelectionColor = Color.Red;
    richTextBox1.DeselectAll();
    richTextBox1.Select(richTextBox1.Text.Length, 0);
  }
  else
  {
    int firstcharindex = richTextBox1.GetFirstCharIndexOfCurrentLine();
    int currentline = richTextBox1.GetLineFromCharIndex(firstcharindex);
    richTextBox1.Select(firstcharindex, 10);
    richTextBox1.SelectionColor = Color.Black;
    richTextBox1.DeselectAll();
    richTextBox1.Select(richTextBox1.Text.Length, 0);
  }
}

Answer 2

您必须指定richTextBox1.SelectionLength。您必须将其设置为行长。

另请参阅：Selectively coloring text in RichTextBox

RichTextBox颜色特定行

2 个答案: