Csharp 如何为RichTextBox中的特定文本上色

This还会在其他单词中显示某个单词的实例.因此，我不知道这是否适用于您需要它的目的，但除此之外，它应该能实现您想要的效果.

//I don't usually work with WinForms so idk if this is the correct way
//to do this or if you can use "sender" or "e" instead of "richTextBox1"
private void richTextBox_TextChanged(object sender, EventArgs e)
{
    int tempint = richTextBox1.SelectionStart;
    richTextBox1.Select(0, richTextBox1.TextLength);
    richTextBox1.SelectionColor = Color.Black;
    richTextBox1.Select(tempint, 0);
    ColorLines(richTextBox1);
}

private void ColorLines(RichTextBox text)
{
    string[] words = { "example", "hi"};

    foreach (string word in words)
    {
        if (text.Text.Contains(word))
        {
            int index = -1;
            int curselected = text.SelectionStart;

            while ((index = text.Text.IndexOf(word, (index + 1))) != -1)
            {
                text.Select(index, word.Length);
                text.SelectionColor = Color.Red;
                text.Select(curselected, 0);
                text.SelectionColor = Color.Black;
            }
        }
    }
}

灵感来自this legends answer

这是另一个版本，它不会在其他单词中显示单词的实例，但当单词前面或后面有符号时，如"，"或""，则不起作用.没有空位.

    private void richTextBox_TextChanged(object sender, EventArgs e)
    {
        int tempint = richTextBox1.SelectionStart;
        richTextBox1.Select(0, richTextBox1.TextLength);
        richTextBox1.SelectionColor = Color.Black;
        richTextBox1.Select(tempint, 0);
        ColorLines(richTextBox1);
    }

    private void ColorLines(RichTextBox text)
    {
        string[] words = { "example", "hi" };
        int startindex = 0;

        foreach (string word2 in text.Text.Split(' ').ToArray())
        {
            foreach (string word in words)
            {
                if (word == word2)
                {
                    int curselected = text.SelectionStart;
                    int length = word2.Length;

                    text.Select(startindex, length);
                    text.SelectionColor = Color.Red;
                    text.Select(curselected, 0);
                    text.SelectionColor = Color.Black;
                }
            }
            startindex += word2.Length + 1;
        }
    }