试图从Linq绑定GridView,不知道如何提取我需要的数据

时间:2013-05-03 14:53:49

标签: c# asp.net xml linq gridview

所以我有一个DataSet,我将其视为IEnumerable,然后应用一个LINQ表达式,将模数组收集到var g中。这是代码隐藏...

    protected void Page_Load(object sender, EventArgs e)
    {
        LinqSamples samples = new LinqSamples(gvNumbers, this.Page);
        samples.DataSetLinq40();
    }

    private class LinqSamples
    {
        private DataSet testDS;
        private GridView _gv;
        private Page _pg;

        public LinqSamples(GridView gv, Page pg)
        {
            testDS = TestHelper.CreateTestDataSet(pg);
            _gv = gv;
            _pg = pg;
        }

        public void DataSetLinq40()
        {
            var numbers = testDS.Tables["Numbers"].AsEnumerable();

            var numberGroups = from n in numbers
                               group n by n.Field<int>("number") % 5 into g
                               select new { Remainder = g.Key, Numbers = g };

            _gv.DataSource = numberGroups;
            _gv.DataBind();
        }
    }

        internal static DataSet CreateTestDataSet(Page pg)
        {
            DataSet ds = new DataSet();

            // Customers Table
            ds.Tables.Add(CreateNumbersTable());

            ds.AcceptChanges();
            return ds;
        }

        private static DataTable CreateNumbersTable()
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
            DataTable table = new DataTable("Numbers");
            table.Columns.Add("number", typeof(int));

            foreach (int n in numbers)
            {
                table.Rows.Add(new object[] { n });
            }
            return table;
        }

...和.aspx页面......

            <asp:GridView ID="gvNumbers" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField HeaderText="Group" DataField="Remainder" />
            <asp:BoundField HeaderText="Number" DataField="Numbers" />
        </Columns>
    </asp:GridView>

我想要的是GridView中的一列具有模数组,例如0,另一列具有该组中的所有数字,逗号分隔,因此0表示“0, 5“,1表示”1,6“,表示2”2,7“等。如何使用我已经拥有的linq结果,包含数据?

当我运行页面时,第二列显示g的类型为System.Collections.Generic.List1[System.Data.DataRow]

1 个答案:

答案 0 :(得分:1)

您可能正在协助查询数据源而不是集合,请使用.ToList()

_gv.DataSource = justNums.ToList();
_gv.DataBind();