C# 读取txt文本内容写入到excel

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 Microsoft.Office.Interop.Excel;
using System.Reflection;

namespace ReadTextToExcel
{
    public partial class FrmReadTxtToExcel : Form
    {
        public FrmReadTxtToExcel()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.ofdRead.ShowDialog();
            this.tbxReadFile.Text = this.ofdRead.FileName;

        }

        private void FrmReadTxtToExcel_Load(object sender, EventArgs e)
        {

        }

        private void btnWrite_Click(object sender, EventArgs e)
        {
            this.ofdWrite.ShowDialog();
            this.tbxWriteFile.Text = this.ofdWrite.FileName;
        }

        private void btnOperate_Click(object sender, EventArgs e)
        {
            FileStream fs = new FileStream(this.tbxReadFile.Text.ToString(), FileMode.Open, FileAccess.Read);
            StreamReader sr = new StreamReader(fs,System.Text.Encoding.GetEncoding("gb2312"));
            Microsoft.Office.Interop.Excel.Application xApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            xApp.Visible = true;
            //得到WorkBook对象, 可以用两种方式之一: 下面的是打开已有的文件
            Microsoft.Office.Interop.Excel.Workbook xBook = xApp.Workbooks._Open(this.tbxWriteFile.Text.ToString(),
            Missing.Value, Missing.Value, Missing.Value, Missing.Value
            , Missing.Value, Missing.Value, Missing.Value, Missing.Value
            , Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            //xBook=xApp.Workbooks.Add(Missing.Value);//新建文件的代码

            //指定要操作的Sheet,如下两种方式
            Microsoft.Office.Interop.Excel.Worksheet xSheet = (Microsoft.Office.Interop.Excel.Worksheet)xBook.Sheets[];
            //Excel.Worksheet xSheet=(Excel.Worksheet)xApp.ActiveSheet;

            sr.BaseStream.Seek(, SeekOrigin.Begin); //定位操作点,begin 是一个参考点
            sr.BaseStream.Seek(, SeekOrigin.Begin); //读一下，看看文件内有没有内容，为下一步循环 提供判断依据
            string str = sr.ReadLine();//如果 文件有内容
            int index = ;
            while (str != null)
            {
                //输出字符串，str 在上面已经定义了 读入一行字符
                this.textBox3.Text = textBox3.Text.ToString() + str;

                //写入数据
                Microsoft.Office.Interop.Excel.Range rng3 = xSheet.get_Range(Convert.ToString("A"+index), Missing.Value);
                rng3.Value2 = str;
                //rng3.Interior.ColorIndex = 6; //设置Range的背景色
                index++;
                str = sr.ReadLine();
            }
            //C#读取TXT文件之后关闭文件，注意顺序，先对文件内部进行关闭，然后才是文件
            sr.Close();
            fs.Close();

            //保存方式一：保存WorkBook
            //xBook.SaveAs(this.textBox2.Text.ToString(),
            //Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
            //Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value,
            //Missing.Value, Missing.Value);

            //保存方式二
            xBook.Save();
            xSheet = null;
            xBook = null;
            xApp.Quit(); //这一句是非常重要的，否则Excel对象不能从内存中退出
            xApp = null;
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Dispose();
            System.Windows.Forms.Application.Exit();
        }

    }
}