dataset导出Excel

  public void CreateExcel(string FileName)
    {

        typeModel.cType_Code = dropType.SelectedValue;
        wareModel.cWare_Code = dropWare.SelectedValue;
        if (txtEmpName.Text == "" || txtEmpName.Text == null)
        {
            assetModel.emp_Id = dropEmp.SelectedValue.Trim();
        }
        else
        {
            employeeModel.Emp_Name = txtEmpName.Text;
        }
        if (dropDepartment.SelectedValue != "")
        {
            Desktop.BLL.Department newdepartment = new Desktop.BLL.Department();
            departmentModel.cChild = newdepartment.GetcChild(dropDepartment.SelectedValue);
        }
        employeeModel.beWorking = dropUserStatus.SelectedValue;
        assetModel.cAsset_Name = txtName.Text;
        assetModel.cAsset_Set = txtSet.Text;
        assetModel.cAsset_From = dropFrom.SelectedItem.Text;
        assetModel.cAsset_Status = dropStatus.SelectedItem.Text;
        if (dtpBeginTime.HasValue == true)
        {
            assetModel.dBuy_Date = dtpBeginTime.Value;
        }
        if (dtpEndTime.HasValue == true)
        {
            assetModel.dReg_Date = dtpEndTime.Value;
        }
        if (txtPriceMin.Text != "")
        {
            assetModel.iPrice = decimal.Parse(txtPriceMin.Text);
        }
        if (txtPriceMax.Text != "")
        {
            assetModel.iCurPrice = decimal.Parse(txtPriceMax.Text);

        }
        assetModel.cCheck = dropCheckStatus.SelectedValue;
        assetModel.cBudNo = txtBudNo.Text;
        assetModel.cAccNo = txtAccNo.Text;
        assetModel.cAssetNo = txtAssetNo.Text;
        assetModel.cCheckNo = txtCheckNo.Text;
        assetModel.cAccCorp = txtAccCorp.Text;
        assetModel.cAccCurCorp = txtAccCurCorp.Text;
        assetModel.cSelYes = DropYes.SelectedValue;

        DataSet ds = asset.GetAssetMain(assetModel, typeModel, wareModel, employeeModel, departmentModel, "");//产生dataset

//主要方法体：

        HttpResponse resp;

        resp = Page.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
       
        string colHeaders = "", ls_item = "";

        //定义表对象与行对象，同时用DataSet对其值进行初始化
        System.Data.DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
        int i = 0;
        int cl = dt.Columns.Count;

        //取得数据表各列标题，各标题之间以t分割，最后一个列标题后加回车符
        for (i = 0; i < cl; i++)
        {
            if (i == (cl - 1))//最后一列，加n
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "\n";
            }
            else
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "\t";
            }

        }
        resp.Write(colHeaders);
        //向HTTP输出流中写入取得的数据信息

        //逐行处理数据 
        foreach (DataRow row in myRow)
        {
            //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据   
            for (i = 0; i < cl; i++)
            {
                if (i == (cl - 1))//最后一列，加n
                {
                    ls_item += row[i].ToString() + "\n";
                }
                else
                {
                    ls_item += row[i].ToString() + "\t";
                }

            }
            resp.Write(ls_item);
            ls_item = "";

        }
        resp.End();
    }