Question

我正在编写一个c＃Html编辑器应用程序，您可以在其中键入RichTextBox控件中的代码。我希望RichTextBox的行为类似于notepad ++和其他代码编辑器，其中Html语法以颜色突出显示，例如：

如何在C＃窗口中创建RichTextBox？我几乎到处搜索，没有找到任何帮助我的东西。这是我到目前为止所尝试的但我没有给出我想要的结果：

private void SyntaxHighlight()
        {
            string[] tags = { "html","head","body","a","b","img","strong","p","h1","h2","h3","h4","h5","h6","embed","iframe","span","form",
                            "button","input","textarea","br","div","style","script","table","tr","td","th","i","u","link","meta","title"};
            foreach (string s in tags)
            {
                richTextBox1.Find("<" + s); 
                richTextBox1.SelectionColor = Color.Blue;
                richTextBox1.Find(">");
                richTextBox1.SelectionColor = Color.Blue;
            }

            string[] attributes = { "href","src","height","width","rowspan","colspan","target","style","onclick","id","name","class"};
            foreach (string s in attributes)
            {
                richTextBox1.Find(s + "=");
                richTextBox1.SelectionColor = Color.Red;
            }
        }

有人能帮助我吗？我应该在SyntaxHighlight（）方法中写什么？有人可以给我适当的代码吗？谢谢

Answer 1

在您的代码中，您只能找到第一次出现的HTML标记并突出显示它。但是，您应该遍历整个富文本内容以查找相同文本的后续出现。我刚刚根据您的确切代码进行了快速模拟，请查看。

    private void highlightHTMLText()
    {
        string[] tags = { "html","head","body","a","b","img","strong","p","h1","h2","h3","h4","h5","h6","embed","iframe","span","form",
                        "button","input","textarea","br","div","style","script","table","tr","td","th","i","u","link","meta","title"};
        foreach (string s in tags)
        {
            findAndHighlight("<" + s, Color.Blue);
            findAndHighlight("</" + s, Color.Blue);
            findAndHighlight(">", Color.Blue);
        }

        string[] attributes = { "href", "src", "height", "width", "rowspan", "colspan", "target", "style", "onclick", "id", "name", "class" };
        foreach (string s in attributes)
        {
            findAndHighlight(s + "=", Color.Red);
        }
    }

    private void findAndHighlight(string sSearchStr, Color oColor)
    {
        int index = richTextBox1.Text.IndexOf(sSearchStr);
        while (index != -1)
        {
            richTextBox1.Select(index, sSearchStr.Length);
            richTextBox1.SelectionColor = oColor;

            index = richTextBox1.Text.IndexOf(sSearchStr, index + sSearchStr.Length);
        }
    }

此外，根据this答案，您应该能够使用Notepad ++本身使用的相同实用程序库Scintilla。正如所指出的，你不需要重新发明轮子，但作为开发人员，我显然更喜欢我自己的工具（它只是我;））。希望这会有所帮助。

Answer 2

查找不移动光标，它返回第一个匹配的位置。试试这个：

How to select text from the RichTextBox and then color it?

如何在C＃窗体中突出显示HTML语法RichTextBox？

2 个答案: