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C#

frmFind.cs：源码内容
							using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace myWorkPad
{
    public partial class frmFind : Form
    {
        // local member variable to hold main form
        MainForm mMain;
        
        // default constructor
        public frmFind()
        {
            InitializeComponent();
        }
        // overloaded constructor - permits passing in main form
        public frmFind(MainForm f)
        {
            InitializeComponent();
            mMain = f;
        }
        private void btnFind_Click(object sender, System.EventArgs e)
        {
            try
            {
                int StartPosition;
                StringComparison SearchType;
                if (chkMatchCase.Checked == true)
                {
                    SearchType = StringComparison.Ordinal;
                }
                else
                {
                    SearchType = StringComparison.OrdinalIgnoreCase;
                }
                StartPosition = mMain.rtMain.Text.IndexOf(txtSearchTerm.Text, SearchType);
                if (StartPosition == 0)
                {
                    MessageBox.Show("String: " + txtSearchTerm.Text.ToString() + " not found", "No Matches", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    return;
                }
                mMain.rtMain.Select(StartPosition, txtSearchTerm.Text.Length);
                mMain.rtMain.ScrollToCaret();
                //mMain.Focus();
                btnFindNext.Enabled = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(), "Error");
            }
        }
        
        
        private void btnFindNext_Click(object sender, System.EventArgs e)
        {
            try
            {
                int StartPosition = mMain.rtMain.SelectionStart + 2;
                StringComparison SearchType;
                if (chkMatchCase.Checked == true)
                {
                    SearchType = StringComparison.Ordinal;
                }
                else
                {
                    SearchType = StringComparison.OrdinalIgnoreCase;
                }
                //StartPosition = Microsoft.VisualBasic.Strings.InStr(StartPosition, mMain.rtMain.Text, txtSearchTerm.Text, SearchType);
                StartPosition = mMain.rtMain.Text.IndexOf(txtSearchTerm.Text, StartPosition, SearchType);
                if (StartPosition == 0 || StartPosition < 0)
                {
                    MessageBox.Show("String: " + txtSearchTerm.Text.ToString() + " not found", "No Matches", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    return;
                }
                mMain.rtMain.Select(StartPosition, txtSearchTerm.Text.Length);
                mMain.rtMain.ScrollToCaret();
                //mMain.Focus();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(), "Error");
            }
        }
        private void txtSearchTerm_TextChanged(object sender, EventArgs e)
        {
            btnFindNext.Enabled = false;
        }
    }
}

						