C# RichTextBox 选择指定文本

Question

我有一个 RichTextBox，其中包含 - 例如 - 此文本:

"This is my Text"

现在我想在 RichTextBox 中“搜索”文本(字符串)，例如:

"Text"

现在应该在 RichTextBox 中选择/突出显示“文本”(对于每个文本)..

有这样的东西:

myRichTextBox.Select();

但是这里我要设置一个StartPosition等等，但是我要搜索String!

我该怎么做？ (搜索stackoverflow，没有找到类似的东西..)

Answer 1

     int start = 0;
int indexOfSearchText = 0;
private void btnFind_Click(object sender, EventArgs e)
        {
            int startindex = 0;

            if(txtSearch.Text.Length > 0)
                startindex = FindMyText(txtSearch.Text.Trim(), start, rtb.Text.Length);

            // If string was found in the RichTextBox, highlight it
            if (startindex >= 0)
            {
                // Set the highlight color as red
                rtb.SelectionColor = Color.Red;
                // Find the end index. End Index = number of characters in textbox
                int endindex = txtSearch.Text.Length;
                // Highlight the search string
                rtb.Select(startindex, endindex);
                // mark the start position after the position of
                // last search string
                start = startindex + endindex;
            }
        }




public int FindMyText(string txtToSearch, int searchStart, int searchEnd)
        {
            // Unselect the previously searched string
            if (searchStart > 0 && searchEnd > 0 && indexOfSearchText >= 0)
            {
                rtb.Undo();
            }

            // Set the return value to -1 by default.
            int retVal = -1;

            // A valid starting index should be specified.
            // if indexOfSearchText = -1, the end of search
            if (searchStart >= 0 && indexOfSearchText >=0)
            {
                // A valid ending index
                if (searchEnd > searchStart || searchEnd == -1)
                {
                    // Find the position of search string in RichTextBox
                    indexOfSearchText = rtb.Find(txtToSearch, searchStart, searchEnd, RichTextBoxFinds.None);
                    // Determine whether the text was found in richTextBox1.
                    if (indexOfSearchText != -1)
                    {
                        // Return the index to the specified search text.
                        retVal = indexOfSearchText;
                    }
                }
            }
            return retVal;
        }



private void textBox1_TextChanged(object sender, EventArgs e)
        {
            start = 0;
            indexOfSearchText = 0;
        }

如果您不理解这段代码，请查看这篇文章... http://www.dotnetcurry.com/ShowArticle.aspx?ID=146