C# 记事本查找替换 新手 请高人多多指教

//主窗体部分

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Printing;

 

 

namespace notepad
{
    public partial class Form1 : Form
    {
        public string path="";
        public string wenben;
        public bool saved;
        System.Drawing.Printing.PrintDocument pd = new System.Drawing.Printing.PrintDocument();
        public Form1()
        {
            InitializeComponent();
             //  richTextBox1.Size.Width = this.Size.Width;
            //    richTextBox1.Size.Height = this.Size.Height;
            saved = false ;
           this.Paint+=new PaintEventHandler(Form1_Paint);
            this.FormClosing+=new FormClosingEventHandler(Form1_FormClosing);
           //richTextBox1.b;
        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {
            wenben = richTextBox1.Text;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.toolStripStatusLabel1.Text = "当前时间为   "+DateTime.Now.ToShortTimeString();
            this.toolStripStatusLabel2.Text= "20082121003 鲍东升制作";
            this.toolStripStatusLabel3.Text = "         软件综合课程设计";
            printPreviewControl1.Document = pd;
           
        }
       
        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "*.txt(文本文档)|*.txt";
            if(openFileDialog1.ShowDialog()==DialogResult.OK)
            {
                StreamReader SReader=new StreamReader(openFileDialog1.FileName,Encoding.Default);
                richTextBox1.Text = SReader.ReadToEnd();
               // richTextBox1.Font = SReader.;
                SReader.Close();
                path = openFileDialog1.FileName;
               
            }
            this.Text = openFileDialog1.SafeFileName;
         //   richTextBox1.LoadFile(path);
         //   MessageBox.Show(path);
        }

        private void 另存为ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            saveFileDialog1.Filter = "*.txt(文本文档)|*.txt";
            if(saveFileDialog1.ShowDialog()==DialogResult.OK)
            {
                StreamWriter SWriter = new StreamWriter(saveFileDialog1.FileName, true);
                SWriter.Write(richTextBox1.Text);
                SWriter.Close();
            }
            saved = true;
        }

        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            saveFileDialog1.DefaultExt = "*.txt";
       //     RichTextBoxStreamType = "*.txt";
            if (path.Length > 0)
            {

                richTextBox1.SaveFile(path, RichTextBoxStreamType.TextTextOleObjs);
                //      MessageBox.Show(path);
            }
            else
            {
                saveFileDialog1.Filter = "*.txt(文本文档)|*.txt";
                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    StreamWriter SWriter = new StreamWriter(saveFileDialog1.FileName, true);
                    SWriter.Write(richTextBox1.Text);
                    SWriter.Close();
                }
            }
            saved = true;
        }

        private void 新建ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = "";
        }
        private void 页面设置ToolStripMenuItem_Click(object sender, EventArgs e)
        {
           
            pageSetupDialog1.Document = pd;
            this.pageSetupDialog1.AllowMargins = true;
            this.pageSetupDialog1.AllowOrientation = true;
            this.pageSetupDialog1.AllowPaper = true;
            this.pageSetupDialog1.AllowPrinter = true;
            this.pageSetupDialog1.ShowDialog();

        }
        private void 打印ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            printDialog1.Document = pd;
         //   e.Graphics.DrawString(path, Brushes.Black, 10, 10);
            printDialog1.AllowPrintToFile = true;
            printDialog1.AllowCurrentPage = true;
            printDialog1.AllowSelection = true;
            printDialog1.AllowSomePages = true;
            printDialog1.ShowDialog();
        }

       

        private void 编辑_Click(object sender, EventArgs e)
        {

        }

        private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if(richTextBox1.CanUndo==true)
            {
                richTextBox1.Undo();
                richTextBox1.ClearUndo();
            }
           
        }

        private void 重复RToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Redo();
        }

        private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (richTextBox1.SelectionLength != 0)
                richTextBox1.Cut();
        }

        private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if(Clipboard.GetText().ToString()!="")
                richTextBox1.Paste();
        }

        private void 全选AToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.SelectAll();
        }

        private void 自定义CToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fontDialog1.AllowVectorFonts = true;
            fontDialog1.AllowVerticalFonts = true;
            fontDialog1.FixedPitchOnly = true;
            fontDialog1.MaxSize = 72;
            fontDialog1.MinSize = 5;
            if(fontDialog1.ShowDialog()==DialogResult.OK)
            {
                if (richTextBox1.SelectedText == "")
                    richTextBox1.SelectAll();
                richTextBox1.SelectionFont = fontDialog1.Font;
            }
           // richTextBox1.Text+=fontDialog1.Tag.ToString();
        }

        private void 选项OToolStripMenuItem_Click(object sender, EventArgs e)
        {
            colorDialog1.AllowFullOpen = true;
            colorDialog1.AnyColor = true;
            colorDialog1.SolidColorOnly = true;
            if(colorDialog1.ShowDialog()==DialogResult.OK)
            {
                if (richTextBox1.SelectedText== "")
                    richTextBox1.SelectAll();
                richTextBox1.SelectionColor = colorDialog1.Color;
            }

        }

        private void 状态栏ToolStripMenuItem_Click(object sender, EventArgs e)
        {
          
        }

        private void 工具TToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if(richTextBox1.SelectionLength!=0)
                richTextBox1.Copy();
        }

        private void 查找ToolStripMenuItem1_Click(object sender, EventArgs e)
        {

        }

        private void 查找ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Search s=new Search();
            s.Owner = this;
            s.Show();
        }
        private void 编辑EToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (richTextBox1.Modified == false)
            {//有修改
                撤消UToolStripMenuItem.Enabled = false;
                重复RToolStripMenuItem.Enabled = false;
            }
            else
            {
                撤消UToolStripMenuItem.Enabled = true;
                重复RToolStripMenuItem.Enabled = true;
            }
            if(richTextBox1.SelectedText=="")
            {
               
                剪切TToolStripMenuItem.Enabled = false;
                复制CToolStripMenuItem.Enabled = false;
                粘贴PToolStripMenuItem.Enabled = false;
            }
            else
            {
                剪切TToolStripMenuItem.Enabled = true;
                复制CToolStripMenuItem.Enabled = true;
                粘贴PToolStripMenuItem.Enabled = true;
            }
            if(richTextBox1.Text=="")
            {
                查找ToolStripMenuItem.Enabled = false;
            }
            else
            {
                查找ToolStripMenuItem.Enabled = true;
            }
            if(Clipboard.GetText().ToString()=="")
            {
                粘贴PToolStripMenuItem.Enabled = false;
            }
            else
                粘贴PToolStripMenuItem.Enabled = true;
            if (richTextBox1.Text != "")
            {
                全选AToolStripMenuItem.Enabled = true;
            }
            else
            {
                全选AToolStripMenuItem.Enabled = false;
            }
        }

        private void 时间日期ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Text += DateTime.Now.ToString();
        }

        private void 替换ToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }
       
       private void Form1_Paint(object sender, EventArgs e)
       {
//              richTextBox1. = this.Size.Width;
//              richTextBox1.Size.Height = this.Size.Height;
       }

       private void 撤销ToolStripMenuItem_Click(object sender, EventArgs e)
       {
         
           if (richTextBox1.CanUndo == true)
           {
               richTextBox1.Undo();
               richTextBox1.ClearUndo();
           }
       }

       private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
       {
           if (richTextBox1.Modified == false)
               撤销ToolStripMenuItem.Enabled = false;
           else
               撤销ToolStripMenuItem.Enabled = true;
           if (richTextBox1.SelectedText == "")
           {
               剪切ToolStripMenuItem.Enabled = false;
               复制ToolStripMenuItem.Enabled = false;
               粘贴ToolStripMenuItem.Enabled = false;
               删除ToolStripMenuItem.Enabled = false;
              

           }
           else
           {
               剪切ToolStripMenuItem.Enabled = true;
               复制ToolStripMenuItem.Enabled = true;
               粘贴ToolStripMenuItem.Enabled = true;
               删除ToolStripMenuItem.Enabled = true;
             
           }
           if(richTextBox1.Text!="")
           {
               全选ToolStripMenuItem.Enabled = true;
           }
           else
           {
               全选ToolStripMenuItem.Enabled = false;
           }
       }

       private void 剪切ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           if (richTextBox1.SelectionLength != 0)
               richTextBox1.Cut();
       }

       private void 复制ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           if (richTextBox1.SelectionLength != 0)
               richTextBox1.Copy();
       }

       private void 粘贴ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           if (Clipboard.GetText().ToString() != "")
               richTextBox1.Paste();
       }

       private void 全选ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           richTextBox1.SelectAll();
       }

       private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
       {
           richTextBox1.SelectedText = "";
       }

       private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
       {

           this.Close();

       }
        private void Form1_FormClosing(object sender, EventArgs e)
        {
            if(saved==false)
            {
                DialogResult dr;
                dr = MessageBox.Show("文件"+path+"的文字已改变。想保存文件吗？", "记事本", MessageBoxButtons.YesNoCancel);
                if(dr==DialogResult.Yes)
                {
                   // MessageBox.Show("S");
                    if(path=="")
                    {
                        另存为ToolStripMenuItem_Click(sender, e);
                    }
                    else
                    {
                        保存ToolStripMenuItem_Click(sender, e);
                    }
                }
                if(dr==DialogResult.Cancel)
                {
                    ((CancelEventArgs)e).Cancel = true;
                }
            }
           
        }

        private void 关于AToolStripMenuItem_Click(object sender, EventArgs e)
        {
            about info = new about();
            info.Show();
        }

        private void 打印预览ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            printPreviewDialog1.Document = this.pd;

            //pd.PrintPage += new PrintPageEventHandler();
           

            printPreviewDialog1.ShowDialog();
        }

        private void toolStripStatusLabel3_Click(object sender, EventArgs e)
        {

        }
      
    }
}

 

//查找替换 窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using notepad;

namespace notepad
{
    public partial class Search : Form
    {
        int weizhi;
        public Search()
        {
            InitializeComponent();
            weizhi = 0;
        }
       
        private void button1_Click(object sender, EventArgs e)
        {
            int index;
           
            Form1 frm1 = this.Owner as Form1;
            index=frm1.richTextBox1.Text.IndexOf(textBox1.Text, weizhi);
            if(index!=-1)
            {
                frm1.richTextBox1.Select(index, textBox1.Text.Length);
                frm1.richTextBox1.Focus();
                weizhi = index+1;
//                 if (weizhi > frm1.richTextBox1.Text.Length)
//                     weizhi = 0;

            }
            else
            {
                MessageBox.Show("无法找到 " + textBox1.Text);
                weizhi = 0;
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            int index;

            Form1 frm1 = this.Owner as Form1;
            index = frm1.richTextBox1.Text.IndexOf(textBox1.Text, weizhi);
            if (index != -1)
            {
              //  frm1.richTextBox1.Text.Replace("b", "a");
                frm1.richTextBox1.Select(index, textBox1.Text.Length);
                frm1.richTextBox1.SelectedText = textBox2.Text;
                frm1.richTextBox1.Focus();
                weizhi = index +textBox2.Text.Length;
            }
            else
            {
                MessageBox.Show("无法找到 " + textBox1.Text);
                weizhi = 0;
            }
        }

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

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            weizhi = 0;
        }

        private void Search_Load(object sender, EventArgs e)
        {

        }
    }
}