C#使用RichTextBox实现替换文字及改变字体颜色功能示例

private void GenerateEntity()
{
  try
  {
    string result = ChangeWords("specific content...");
    txtContent.Text = result;
    ChangeColor();
  }
  catch (Exception ex)
  {
    MessageBox.Show("类生成失败！错误信息：" + ex.Message);
  }
}
private string ChangeWords(string content)
{
  //先替换"nvarchar"、"varchar"、"nchar"，再替换"char"
  //不然"nvarchar"、"varchar"、"nchar"就会被替换为
  //nvarstring"、"varstring"、"nstring"不能进行原有规则替换
  string result = Regex.Replace(content, "nvarchar", "string");
  //进行下一步替换的时一定要以上一步替换的返回结果为数据源而不是content
  //因为content值没有改变
  result = Regex.Replace(result, "varchar", "string");
  result = Regex.Replace(result, "nchar", "string");
  result = Regex.Replace(result, "char", "string");
  result = Regex.Replace(result, "tinyint", "int");
  result = Regex.Replace(result, "smallint", "int");
  result = Regex.Replace(result, "bigint", "int");
  result = Regex.Replace(result, "datetime", "DateTime");
  return result;
}

private void ChangeColor()
{
  txtContent.SelectionStart = 0;
  txtContent.SelectionLength = txtContent.Text.Length;
  txtContent.SelectionColor = Color.Black;
  //列注释不为空时，改变列注释颜色
  if (listDescription.Count > 0)
  {
    ChangeKeyColor(listDescription, Color.Green);
  }
  ChangeKeyColor("namespace", Color.Blue);
  ChangeKeyColor("public", Color.Blue);
  ChangeKeyColor("class", Color.Blue);
  ChangeKeyColor("/// 
",Color.Gray);
  ChangeKeyColor("///", Color.Gray);
  ChangeKeyColor("/// 
", Color.Gray);
  ChangeKeyColor("int", Color.Blue);
  ChangeKeyColor("double", Color.Blue);
  ChangeKeyColor("float", Color.Blue);
  ChangeKeyColor("char", Color.Blue);
  ChangeKeyColor("string", Color.Blue);
  ChangeKeyColor("bool", Color.Blue);
  ChangeKeyColor("decimal", Color.Blue);
  ChangeKeyColor("enum", Color.Blue);
  ChangeKeyColor("const", Color.Blue);
  ChangeKeyColor("struct", Color.Blue);
  ChangeKeyColor("DateTime", Color.CadetBlue);
  ChangeKeyColor("get",Color.Blue);
  ChangeKeyColor("set", Color.Blue);
}
public void ChangeKeyColor(string key, Color color)
{
  Regex regex = new Regex(key);
  //找出内容中所有的要替换的关键字
  MatchCollection collection = regex.Matches(txtContent.Text);
  //对所有的要替换颜色的关键字逐个替换颜色
  foreach (Match match in collection)
  {
    //开始位置、长度、颜色缺一不可
    txtContent.SelectionStart = match.Index;
    txtContent.SelectionLength = key.Length;
    txtContent.SelectionColor = color;
  }
}
public void ChangeKeyColor(List list, Color color)
{
  foreach (string str in list)
  {
    ChangeKeyColor(str, color);
  }
}