导入Excel

    using Excel; 
      using System;
      using System.Reflection; // 引用这个才能使用Missing字段

      namespace CExcel1
      {
        class Class1
        {
            [STAThread]
          static void Main(string[] args)
          {
            //创建Application对象
            Excel.Application xApp=new 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
            Excel.Workbook xBook=xApp.Workbooks._Open(@"D:\Sample.xls",
            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，两种方式：

            Excel.Worksheet xSheet=(Excel.Worksheet)xBook.Sheets[1];
            //Excel.Worksheet xSheet=(Excel.Worksheet)xApp.ActiveSheet;

            //读取数据，通过Range对象
            Excel.Range rng1=xSheet.get_Range("A1",Type.Missing);
            Console.WriteLine(rng1.Value2);

            //读取，通过Range对象，但使用不同的接口得到Range
            Excel.Range rng2=(Excel.Range)xSheet.Cells[3,1];
            Console.WriteLine(rng2.Value2);

            //写入数据
            Excel.Range rng3=xSheet.get_Range("C6",Missing.Value);
            rng3.Value2="Hello";
            rng3.Interior.ColorIndex=6; //设置Range的背景色

            //保存方式一：保存WorkBook
            xBook.SaveAs(@"D:\CData.xls",
  Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value,
             Excel.XlSaveAsAccessMode.xlNoChange,Missing.Value,Missing.Value,Missing.Value,
             Missing.Value,Missing.Value);

            //保存方式二：保存WorkSheet
            xSheet.SaveAs(@"D:\CData2.xls",
  Missing.Value,Missing.Value,Missing.Value,Missing.Value,
             Missing.Value,Missing.Value,Missing.Value,Missing.Value,Missing.Value);

            //保存方式三
            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;
          }
        }
      }