把WebForm數據導出到Excel中

上午給系統的訂單管理部分添加了一個功能，把查詢到的訂單信息導出到Excel，供管理員分析用。以前寫的代碼如下：

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();  
        我的查詢用了分頁，客戶要求把所有查詢到的數據都導出到Excel，所以不能象以前那樣通過把控件的內容導出到Excel來實現此功能，於是把代碼改成這樣：
   Response.Clear();
Response.BufferOutput = true;
Response.Charset = "GB2312";
Response.AppendHeader("Content-Disposition","attachment;filename = 訂單.xls"); 
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Response.ContentType = "application/ms-Excel";
string strExcelHeader = string.Empty;
string strExcelItems; 
if(VIEwState["SQL"] != null)    // 取前面查詢用的SQL語句
{
     // 取得各列標題，各標題之間以\t分割，最後一個列標題後加回車符  
     strExcelHeader = "訂單號\t經銷商\t地區\t小類\t商品\t實付金額\t下單時間\t有效狀態\t處理狀態\t\n";                                      
    // 向HTTP輸出流中寫入取得的數據信息  
    Response.Write(strExcelHeader);    
          
    // 逐行處理查詢結果數據  
    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"].T
oString() + "\t";
        strExcelItems += reader["IsValid"].ToString() + "\t";
        strExcelItems += reader["DealState"].ToString()  +"\n";                                                   
        Response.Write(strExcelItems);  
   }  
    reader.Close();
    Response.End();
}    
       我這裡只是簡單的把查詢到的數據以Excel的形式Write出來(當然也可以是其他格式，比如XML)，對簡單的需求足矣了，當然，用.Net直接去操作Excel文件也是很簡單的，有很多這樣的例子可以參考。