ReportViewer动态加载数据源

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using BLL;
using Model;
using Microsoft.Reporting.WebForms;

public partial class Rpt : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = getProducts();
            ReportDataSource rds = new ReportDataSource("DataSet1_DataTable1", dt);
            ReportViewer1.LocalReport.DataSources.Clear();
            ReportViewer1.LocalReport.DataSources.Add(rds);
            ReportViewer1.LocalReport.Refresh();
        }

    }
    public static DataTable getProducts()
    {
        //添加DataTable表列名匹配字段
        DataTable dt = new DataTable("Products");
        dt.Columns.Add("Productid",typeof(Int32));
        dt.Columns.Add("Productname",typeof(string));
        dt.Columns.Add("Quantityperunit",typeof(string));
        dt.Columns.Add("Unitprice",typeof(double));
        dt.Columns.Add("Unitsinstock",typeof(Int32));
        dt.Columns.Add("Categoryname",typeof(string));
        //从BLL调用方法返回产品
        List<Products> products = ProductsManage.GetAllProducts();
        //将实体对象转化到DataTable
        for (int i = 0; i < products.Count; i++) 
        {
            DataRow dr = dt.NewRow();
            dr["Productid"] = Convert.ToInt32(products[i].Productid);
            dr["Productname"] = products[i].Productname.ToString();
            dr["Quantityperunit"] = products[i].Quantityperunit.ToString();
            dr["Unitprice"] = Convert.ToDouble(products[i].Unitprice);
            dr["Unitsinstock"] = Convert.ToInt32(products[i].Unitsinstock);
            dr["Categoryname"] = products[i].Category.Categoryname.ToString();
            dt.Rows.Add(dr);
        }
        return dt;
    }
}