string path = "c://date//xyu.txt";
      StreamReader sr = new StreamReader(path);
      string strLine = sr.ReadLine();
      int rowNum = 1;
      object missing = System.Reflection.Missing.Value;

      ApplicationClass app = new ApplicationClass();

      app.Application.Workbooks.Add(true);

      Workbook book = (Workbook)app.ActiveWorkbook;
      Worksheet sheet = (Worksheet)book.ActiveSheet;
      while (!string.IsNullOrEmpty(strLine))
      {
        string[] tempArr;
        tempArr = strLine.Split(',');
        for (int k = 1; k <= tempArr.Length; k++)
        {
          sheet.Cells[rowNum, k] = tempArr[k - 1];

        }
        strLine = sr.ReadLine();
        rowNum++;

      }

      //保存excel文件
      book.SaveCopyAs("D://source.xls");
      //关闭文件
      book.Close(false, missing, missing);
      //退出excel
      app.Quit();
      MessageBox.Show("转化成功！");

 string path = "c://date//xyu.txt";
      StreamReader sr = new StreamReader(path);
      string strLine = sr.ReadLine();
      int rowNum = 1;
      object missing = System.Reflection.Missing.Value;

      ApplicationClass app = new ApplicationClass();

      app.Application.Workbooks.Add(true);

      Workbook book = (Workbook)app.ActiveWorkbook;
      Worksheet sheet = (Worksheet)book.ActiveSheet;
      Range r = sheet.get_Range("A1", "C1");

      //获取行数

 
 


      object[,] objectData = new object[65535, 3]; 
      while (!string.IsNullOrEmpty(strLine))
      {
        string[] tempArr;
        tempArr = strLine.Split(',');
        for (int k = 1; k <= tempArr.Length; k++)
        {
          
          objectData[rowNum-1, k-1] = tempArr[k - 1];

        }
        strLine = sr.ReadLine();
        rowNum++;

      }
      r = r.get_Resize(65535, 3);
      r.Value2 = objectData;
      r.EntireColumn.AutoFit();
      //保存excel文件
      book.SaveCopyAs("D://source.xls");
      //关闭文件
      book.Close(false, missing, missing);
      //退出excel
      app.Quit();
      MessageBox.Show("转化成功！");