今天先总结导出为Excel的几种方法：
（一）直接从Gridview中导出数据到Excel：
protected void btnExport_Click(object sender, EventArgs e)
{
string sql="";
DataTable MyTable = DB.getdatetable(sql);
grvExport.DataSource = MyTable;
grvExport.DataBind();
Response.Clear();
Response.Charset = "GB2312";
Response.Write("<meta http-equiv=Content-Type content=text/html;charset=GB2312>");
Response.AddHeader("content-disposition", "attachment; filename=WWInvReport.xls");
Response.ContentType = "application/vnd.ms-excel";
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
grvExport.RenderControl(hw);
Response.Write(tw.ToString());
Response.End();
hw.Dispose();
tw.Dispose();
MyTable.Dispose();
adp.Dispose();
cnn.Dispose();
GC.Collect();
}
public override void VerifyRenderingInServerForm(Control control)
{
}
下面的过载函数一定要有，否则会出错；注意GridView若是分页或者排序的先将其设置为false;
若不希望有列的数字转化为科学计数法在DataBound中设置
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[2].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
}
（二）用拼写HTML的方法直接输出：
public static void DownLoad_SQLtoExcel_2(Page page, DataView dv, string fileName)
{
StringBuilder sb = new StringBuilder();
page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls");
sb.Append("<html><head>");
sb.Append("<meta http-equiv=Content-Type content="text/html; charset=utf-8"></head><body><table border=1 style='font-weight:bold;font-size:12px;font-family:Times New Roman;'>");
sb.Append("<tr style='color:#FFFFFF;height: 22px;vertical-align:middle;'>");
//第一行表頭
for (int i = 0; i < dv.Table.Columns.Count; i++)
{
sb.Append("<td align='center' style='background-color:#999999;'>")
.Append(" " + dv.Table.Columns[i].ToString())
.Append("</td>");
}
sb.Append("</tr>");
for (int i = 0; i < dv.Count; i++)
{
sb.Append("<tr style='color:#000000;text-decoration:none;background-color:#FFFFFF;line-height:22px;text-align:center;'>");
//固定位置單元值
for (int j = 0; j < dv.Table.Columns.Count; j++)
{
string cells = dv.Table.Rows[i][j].ToString();
sb.Append("<td width='100px' align='center' style='vnd.ms-excel.numberformat:@;'>" + cells + "</td>");
}
sb.Append("</tr>");
}
sb.Append("</table></body></html>");
page.Response.Write(sb.ToString());
page.Response.End();
（三）分Sheet导出
public static void Excel(DataSet ds, string file_path_name, string file_name)
{
//定义动态数组，以便存放dataset中每个表的记录数
long[] rows = new long[ds.Tables.Count];
string saveFileName = file_path_name;
Application xlApp = new Excel.ApplicationClass();
_Workbook workbook=xlApp.Workbooks.Add(true);
_Worksheet worksheet =null; //取得sheet1
//查看本机是否装有OFFICE软件
if (xlApp == null)
{
return;
}
//tc是table_count,用来遍历每个表
for (int tc = 0; tc < ds.Tables.Count; tc++)
{
object missing1 = System.Reflection.Missing.Value;
worksheet = (Excel.Worksheet)workbook.Worksheets.Add(missing1, missing1, missing1, missing1);//添加一个sheet
worksheet.Name = ds.Tables[tc].TableName; //将DataSet表名来作为输出Excel中Sheet的名字
rows[tc] = ds.Tables[tc].Rows.Count;
//定义动态数姐存放所有需要汇出的数据
string[,] datas = new string[ds.Tables[tc].Rows.Count + 1, ds.Tables[tc].Columns.Count];
for (int i = 0; i < ds.Tables[tc].Columns.Count; i++) //写入标题
{
datas[0, i] = ds.Tables[tc].Columns[i].Caption;
}
//标题的记录区域range_title
Excel.Range range_title = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, ds.Tables[tc].Columns.Count]);
range_title.Interior.ColorIndex = 15; //15代表灰色
range_title.Font.Bold = true;
range_title.Font.Size = 9;
//r用来记录table的行数，j用来记录table的列数
int r = 0;
for (r = 0; r < ds.Tables[tc].Rows.Count; r++)
{
for (int j = 0; j < ds.Tables[tc].Columns.Count; j++)
{
if (ds.Tables[tc].Columns[j].DataType == typeof(string) || ds.Tables[tc].Columns[j].DataType == typeof(int) || ds.Tables[tc].Columns[j].DataType == typeof(Decimal) || ds.Tables[tc].Columns[j].DataType == typeof(DateTime))
{
//依次取每行每列的数据
object obj = ds.Tables[tc].Rows[r][ds.Tables[tc].Columns[j].ColumnName];
datas[r + 1, j] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式
}
}
}
//定义整个区域包括标题和数据
Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[ds.Tables[tc].Rows.Count + 1, ds.Tables[tc].Columns.Count]);
fchR.Value2 = datas;
worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
//标题的记录区域range_data
Excel.Range range_data = worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[ds.Tables[tc].Rows.Count + 1, ds.Tables[tc].Columns.Count]);
range_data.Font.Size = 9;
range_data.RowHeight = 14.25;
range_data.Borders.LineStyle = 1;
range_data.HorizontalAlignment = 1;
//--合併單元格的操作--
//數組操作從0開始,ExcelCells從1開始
int n = 2; //Excel從第2行開始，因為第一行是標題
for (int m = 2; m <= ds.Tables[tc].Rows.Count + 1; m++)
{
if (m <ds.Tables[tc].Rows.Count+1)
{
if (ds.Tables[tc].Rows[m - 2][0].ToString() == ds.Tables[tc].Rows[m - 1][0].ToString())//DataTable是從第０行開始
{
xlApp.Cells[m + 1, 1] = "";
}
else
{
worksheet.get_Range((Excel.Range)worksheet.Cells[n, 1], (Excel.Range)worksheet.Cells[m, 1]).Merge(0);//合并单元格
n = m + 1;
}
}
else
{
worksheet.get_Range((Excel.Range)worksheet.Cells[n, 1], (Excel.Range)worksheet.Cells[m, 1]).Merge(0);
}
}
}
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName);
workbook.Close(false, null, null);
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.WriteFile(file_path_name);
response.Charset = "utf-8";
response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
response.ContentType = "application/ms-excel";
string httpHeader = "attachment;filename=" + file_name + ".xls";
response.AppendHeader("Content-Disposition", httpHeader);
response.Flush();
System.IO.File.Delete(saveFileName);//删除临时文件
xlApp.Quit();
GC.Collect();//强行销毁
response.End();
}
这种方法用的时候，需要在服务器上设置元件服务的权限，另外一定要有workbook.Close(false, null, null); 这句，否则的话每次会在服务器上开启一个Excel进程，多次之后就会报错；