如何用C#在winform中實現簡單的尋找功能

以前寫過一個web上的尋找的例子，這次寫了一個winform下的，當然還是要用Regex。一個視窗，上面有一個richTextBox，一個輸入框，三個button：尋找，前一個，後一個。

主要代碼：

MatchCollection matches;

int index = 0;

private void button1_Click(object sender, EventArgs e)

{

        this.index = 0;

        this.richTextBox1.HideSelection = false;

        Regex rx = new Regex(this.textBox1.Text,

        RegexOptions.Compiled | RegexOptions.IgnoreCase);

 

        matches = rx.Matches(this.richTextBox1.Text);

 

        btnNext_Click(sender, e);

}

 

private void btnNext_Click(object sender, EventArgs e)

{

        if (matches.Count > 0 && index < matches.Count )

        {

                Match match = matches[index];

                int currentPos = match.Index;

                this.richTextBox1.Select(currentPos, this.textBox1.Text.Length);

                if (index == matches.Count - 1)

                {

                        MessageBox.Show("end");

                }

                else

                {

                        index += 1;

                }

        }

}

 

private void btnPrev_Click(object sender, EventArgs e)

{

        if (matches.Count > 0 && index >= 0 )

        {

                Match match = matches[index];

                int currentPos = match.Index;

                this.richTextBox1.Select(currentPos, this.textBox1.Text.Length);

                if (index == 0)

                {

                        MessageBox.Show("start");

                }

                else

                {

                        index -=1;

                }

        }

}