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();}