防止在 RichTextBox 中删除或更改某些文本 [英] Preventing a Certain Text to be Deleted or Change in a RichTextBox

问题描述

我有 RichTextBox，它有一个特定的默认文本在每次表单加载时加载.

i have RichTextBox which has a certain default text to load everytime the Form Load .

此文字例如:

// Do not Exclude this line below

我可以在换行符中添加文本并在必要时删除，但不能在这一行.

i can add text in newline and delete if necessary but must not this line .

就像我在单词below"中删除e"一样，它必须回到单词below".同样添加空格或字符.

like if i delete "e" in word "below" it must comeback to word "below" . same adding space or char .

我在 Keydown 事件中开始了这段代码:

i started out this code in Keydown Event:

Regex donotexclude = new Regex(@"//\s+\s+\s+\s+\s+\s+Do\s+not\s+exclude\s+line\s+below");
            MatchCollection donotexcluDE = donotexclude.Matches(rtb_JS.Text);

            // if (Keys.Space && 

            foreach (Match DONOTEXCLUDE in donotexcluDE)
            {

                if (DONOTEXCLUDE.Success)
                {
                    var donot = DONOTEXCLUDE.Groups[0].Value.ToString();

                    //if (!donot.Length =>
                    //{

                    //}
                }
                else
                {

                }
            }

但我不知道我应该添加什么代码，或者我在第一时间做错了什么.

but I dunno what code should I add or if Im doing a wrong thing in the 1st place .

现在我的问题是如何保护 RichTextBox 中的某个文本不被删除或更改".

Now my question was "How can I protect a certain text in a RichTextBox from deleting or changing" .

感谢和更多力量！

推荐答案

不要重新发明轮子.使用 SelectionProtected 属性

richTextBox.Rtf = ...;
richTextBox.SelectAll(); or richTextBox.Select(start, length)//Select that line
richTextBox.SelectionProtected = true;
richTextBox.SelectionLength = 0;

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