C#实现将DataTable内容输出到Excel表格的方法

//按钮：将数据保存到Excel表格中
private void btnSave_Click(object sender, EventArgs e)
{
  SaveToExcel(txtAddress.Text, (DataTable)dgvTable4Output.DataSource);
}

private void FormMain_Load(object sender, EventArgs e)
{
  System.Data.DataTable dt; 
  string s1 = "甲乙丙丁戊己庚辛壬癸";
  string s2 = "子丑寅卯辰巳午未申酉戌亥";
  dt = new System.Data.DataTable("天干地支表");
  //行表格
  dt.Columns.Add("列0"); dt.Columns.Add("列1");
  dt.Columns.Add("列2"); dt.Columns.Add("列3");
  dt.Columns.Add("列4"); dt.Columns.Add("列5");
  dt.Columns.Add("列6"); dt.Columns.Add("列7");
  dt.Columns.Add("列8"); dt.Columns.Add("列9");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  dt.Rows.Add("", "", "", "", "", "", "", "", "", "");
  //生成干支表
  int x = 0, y = 0;
  for (int i = 0; i < 6; i++)
  {
    for (int j = 0; j < 10; j++)
    {
      dt.Rows[i][j] = s1[x].ToString() + s2[y].ToString();
      x++; x = (x < s1.Length ? x : 0);
      y++; y = (y < s2.Length ? y : 0);
    }
  }
  dgvTable4Output.DataSource = dt;
}

//按钮：将数据保存到Excel表格中
private void btnSave_Click(object sender, EventArgs e)
{
  SaveToExcel(txtAddress.Text, (DataTable)dgvTable4Output.DataSource);
}

/// <summary>
/// 将数据表保存到Excel表格中
/// </summary>
/// <param name="addr">Excel表格存放地址（程序运行目录后面的部分）</param>
/// <param name="dt">要输出的DataTable</param>
public void SaveToExcel(string addr, System.Data.DataTable dt)
{
  //0.注意：
  // * Excel中形如Cells[x][y]的写法，前面的数字是列，后面的数字是行!
  // * Excel中的行、列都是从1开始的，而不是0
  //1.制作一个新的Excel文档实例
  Excel::Application xlsApp = new Excel::Application();
  xlsApp.Workbooks.Add(true);
  /* 示例输入：需要注意Excel里数组以1为起始（而不是0）
    * for (int i = 1; i < 10; i++)
    * {
    *   for (int j = 1; j < 10; j++)
    *   {
    *     xlsApp.Cells[i][j] = "-"; 
    *   }
    * }
    */
  //2.设置Excel分页卡标题
  xlsApp.ActiveSheet.Name = dt.TableName;
  //3.合并第一行的单元格
  string temp = "";
  if (dt.Columns.Count < 26)
  {
    temp = ((char)('A' + dt.Columns.Count)).ToString();
  }
  else if (dt.Columns.Count <= 26 + 26 * 26)
  {
    temp = ((char)('A' + (dt.Columns.Count - 26) / 26)).ToString()
      + ((char)('A' + (dt.Columns.Count - 26) % 26)).ToString();
  }
  else throw new Exception("列数过多");
  Excel::Range range = xlsApp.get_Range("A1", temp + "1");
  range.ClearContents(); //清空要合并的区域
  range.MergeCells = true; //合并单元格
  //4.填写第一行：表名，对应DataTable的TableName
  xlsApp.Cells[1][1] = dt.TableName;
  xlsApp.Cells[1][1].Font.Name = "黑体";
  xlsApp.Cells[1][1].Font.Size = 25;
  xlsApp.Cells[1][1].Font.Bold = true;
  xlsApp.Cells[1][1].HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;//居中
  xlsApp.Rows[1].RowHeight = 60; //第一行行高为60（单位：磅）
  //5.合并第二行单元格，用于书写表格生成日期
  range = xlsApp.get_Range("A2", temp + "2");
  range.ClearContents(); //清空要合并的区域
  range.MergeCells = true; //合并单元格
  //6.填写第二行：生成时间
  xlsApp.Cells[1][2] = "报表生成于：" + DateTime.Now.ToString();
  xlsApp.Cells[1][2].Font.Name = "宋体";
  xlsApp.Cells[1][2].Font.Size = 15;
  //xlsApp.Cells[1][2].HorizontalAlignment = 4;//右对齐
  xlsApp.Cells[1][2].HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;//居中
  xlsApp.Rows[2].RowHeight = 30; //第一行行高为60（单位：磅）
  //7.填写各列的标题行
  xlsApp.Cells[1][3] = "序号";
  for (int i = 0; i < dt.Columns.Count; i++)
  {
    xlsApp.Cells[i + 2][3] = dt.Columns[i].ColumnName;
  }
  xlsApp.Rows[3].Font.Name = "宋体";
  xlsApp.Rows[3].Font.Size = 15;
  xlsApp.Rows[3].Font.Bold = true;
  xlsApp.Rows[3].HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;//居中
  //设置颜色
  range = xlsApp.get_Range("A3", temp + "3");
  range.Interior.ColorIndex = 33;
  //8.填写DataTable中的数据
  for (int i = 0; i < dt.Rows.Count; i++)
  {
    xlsApp.Cells[1][i + 4] = i.ToString();
    for (int j = 0; j < dt.Columns.Count; j++)
    {
      xlsApp.Cells[j + 2][i + 4] = dt.Rows[i][j];
    }
  }
  range = xlsApp.get_Range("A4", temp + (dt.Rows.Count + 3).ToString());
  range.Interior.ColorIndex = 37;
  range.HorizontalAlignment = Excel.XlVAlign.xlVAlignCenter;
  //9.描绘边框
  range = xlsApp.get_Range("A1", temp + (dt.Rows.Count + 3).ToString());
  range.Borders.LineStyle = 1;
  range.Borders.Weight = 3;
  //10.打开制作完毕的表格
  //xlsApp.Visible = true;
  //11.保存表格到根目录下指定名称的文件中
  xlsApp.ActiveWorkbook.SaveAs(Application.StartupPath + "/" + addr);
  xlsApp.Quit();
  xlsApp = null;
  GC.Collect();
}