把WebForm数据导出到Excel中

上午给系统的订单管理部分添加了一个功能，把查询到的订单信息导出到Excel，供管理员分析用。以前写的代码如下：

Response.Clear();

Response.BufferOutput = true;

Response.Charset = "GB2312";

Response.AppendHeader("Content-Disposition","attachment;filename = FileName.xls");

Response.ContentEncoding = Encoding.GetEncoding("GB2312");

Response.ContentType = "application/ms-excel";

this.EnableViewState = false;

System.Globalization.CultureInfo myinfo = new System.Globalization.CultureInfo("ZH-CN", true);

StringWriter osw = new StringWriter(myinfo);

HtmlTextWriter ohtw = new HtmlTextWriter(osw);

dgQueryResult.RenderControl(ohtw);

Response.Write(osw);

Response.End();

我的查询用了分页，客户要求把所有查询到的数据都导出到Excel，所以不能象以前那样通过把控件的内容导出到Excel来实现此功能，于是把代码改成这样：

Response.Clear();

Response.BufferOutput = true;

Response.Charset = "GB2312";

Response.AppendHeader("Content-Disposition","attachment;filename = 订单.xls");

Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

Response.ContentType = "application/ms-excel";

string strExcelHeader = string.Empty;

string strExcelItems;

if(ViewState["SQL"] != null) // 取前面查询用的SQL语句

{

// 取得各列标题，各标题之间以\t分割，最后一个列标题后加回车符

strExcelHeader = "订单号\t经销商\t地区\t小类\t商品\t实付金额\t下单时间\t有效状态\t处理状态\t\n";

// 向HTTP输出流中写入取得的数据信息

Response.Write(strExcelHeader);

// 逐行处理查询结果数据

ITDBHandle itDbHandle = new ITDBHandle();

itDbHandle.QueryString = ViewState["SQL"].ToString();

SqlDataReader reader = itDbHandle.ExecuteDataReader();

while(reader.Read())

{

strExcelItems = string.Empty;

strExcelItems += reader["OrderID"].ToString() + "\t";

strExcelItems += reader["DealerName"].ToString() + "\t";

strExcelItems += reader["City"].ToString() + "\t";

strExcelItems += reader["SmallClassName"].ToString() + "\t";

strExcelItems += reader["BrandName"].ToString() + reader["Model"].ToString() + "\t";

strExcelItems += reader["TotalPrice"].ToString() + "\t";

strExcelItems += reader["OrderDate"].ToString() + "\t";

strExcelItems += reader["IsValid"].ToString() + "\t";

strExcelItems += reader["DealState"].ToString() +"\n";

Response.Write(strExcelItems);

}

reader.Close();

Response.End();

}

我这里只是简单的把查询到的数据以Excel的形式Write出来(当然也可以是其他格式，比如XML)，对简单的需求足矣了，当然，用.NET直接去操作Excel文件也是很简单的，有很多这样的例子可以参考。