刷新richtextbox

Question

我在win表单应用程序中使用了一个富文本框。我正在搜索特定文本并突出显示所选文本。假设我正在搜索字符串“he_llo”，因此突出显示“he_llo”。我纠正它为“你好”。我在按钮单击中调用高亮功能。如果字符串被更正为hello，那么它不应该突出显示。但它突出了。

 private void btnValidate_Click(object sender, EventArgs e)
        {
            Validate();

        }

public void Validate（）     {         string [] words;         object [] items = chklbErrorlist.CheckedItems.OfType（）。ToArray（）;

    for (int i = 0; i < errorList.Count; i++)
    {
        //errorList.Add(items[i]);
        if (rtbFileDisplay.Text.IndexOf((errorList[i].ToString())) != -1)
        {
            wordToFind = errorList[i].ToString();
            index = rtbFileDisplay.Text.IndexOf(wordToFind);
            lstErrorList.Items.Add(index.ToString());
            while (index != -1)
            {
                rtbFileDisplay.Select(index, wordToFind.Length);
                rtbFileDisplay.SelectionBackColor = Color.Red;
                index = rtbFileDisplay.Text.IndexOf(wordToFind, index + wordToFind.Length);
                lstErrorList.Items.Add(index.ToString());
            }

        }
    }

    #region "Special Char"
    foreach (string exp in RegularExpSpChar)
    {
        int pos = 0;

        char ch = exp[1];
        words = null;
        words = rtbFileDisplay.Text.Split(ch);

        pos = words[0].Length;

        Regex myregex;
        if (ch.Equals('.'))
        {
            string expr = @"^\.+[a-zA-Z]";
            myregex = new Regex(expr);
        }
        else
        {

            myregex = new Regex(exp);
        }

        for (int index = 1; index < words.Length; index++)
        {
            string line = ch + words[index];
            bool isexist = myregex.IsMatch(line);
            if (isexist)
            {
                rtbFileDisplay.Select(pos, 1);
                rtbFileDisplay.SelectionBackColor = Color.Red;
            }
            else
            {
                rtbFileDisplay.Select(pos, 1);
                rtbFileDisplay.SelectionBackColor = Color.White;
            }
            pos = pos + line.Length;
        }
    }
    #endregion
    #region "Special"
    foreach (string exp in RegularExpSpecial)
    {

        int pos = 0;
        char ch = exp[2];
        words = null;
        switch (ch)
        {
            case 'i': tagtype = "</i>";
                highlightlen = 5;
                break;
            case 'b': tagtype = "</b>";
                highlightlen = 5;
                break;
            case 's': 
                if(exp[3] == 'u' && exp[4] == 'p')
                {
                    tagtype = "</sup>";
                    highlightlen = 7;
                }
                else if (exp[5] == 'n')
                {
                    tagtype = "</span>";
                    highlightlen = 8;
                }
                break;
            case '8': 
                if(exp[1] == '#' && exp[4] == '2' && exp[5] == '1')
                {
                    tagtype = "&#8221;";
                    highlightlen = 8;
                }

                else if (exp[1] == '#' && exp[4] == '1' && exp[5] == '1')
                {
                    tagtype = "&#8217;";
                    highlightlen = 8;
                }
                break;
            default: break;
        }


        words = Regex.Split(rtbFileDisplay.Text, tagtype);

        pos = words[0].Length;

        Regex myregex;
        myregex = new Regex(exp);

        for (int index = 1; index < words.Length; index++)
        {
            string line = tagtype + words[index];
            bool isexist = myregex.IsMatch(line);
            if (isexist)
            {
                rtbFileDisplay.Select(pos,highlightlen);
                rtbFileDisplay.SelectionBackColor = Color.Red;

            }
            pos = pos + line.Length;
        }
    }
    #endregion

其中pos是he_llo的索引，而highlighten是he_llo的长度。

Answer 1

您可能只需要突出显示所有文本并将selectionbackcolor设置为白色。