突出显示所有搜索词

问题描述

在我的RichtextBox中，如果我写的如下.

In my RichtextBox, if I have written as below.

这是我的笔，
他的笔很漂亮.

现在我搜索单词is"然后输出如下.

Now I search word "is" thenoutput would be as below.

所有是"都应突出显示.

All "is" should be highlighted.

推荐答案

怎么样:

static class Utility {
    public static void HighlightText(this RichTextBox myRtb, string word, Color color) {

       if (word == string.Empty)
            return;

       int s_start = myRtb.SelectionStart, startIndex = 0, index;

       while((index = myRtb.Text.IndexOf(word, startIndex)) != -1) {
           myRtb.Select(index, word.Length);
           myRtb.SelectionColor = color;

           startIndex = index + word.Length;
       }

       myRtb.SelectionStart = s_start;
       myRtb.SelectionLength = 0;
       myRtb.SelectionColor = Color.Black;
    }
}

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