如何将gridview聚焦的行值一一地放入网格中

问题描述

| 我有一个主详细信息网格。当我关注主网格时，它将显示信息详细网格。它一次显示一个焦点一个网格，但希望将先前的数据保留在详细网格中，而将第二个聚焦行数据也保留在网格中像这样以前的数据     

解决方法

您可以处理主网格的SelectedIndexChanged事件，并将所选项目的数据键放在单独的列表中。之后，使用所有主网格数据重新绑定详细信息网格，这些ID将存储在该列表中。

<asp:GridView ID=\"MasterGridView\" runat=\"server\" AutoGenerateColumns=\"false\" Caption=\"Master\"
        DataKeyNames=\"Id\">
        <Columns>
            <asp:CommandField ShowSelectButton=\"true\" SelectText=\"Select\" />
            <asp:BoundField HeaderText=\"Id\" DataField=\"Id\" />
            <asp:BoundField HeaderText=\"Name\" DataField=\"Name\" />
        </Columns>
    </asp:GridView>
    <hr />
    <asp:GridView ID=\"DetailsGridView\" runat=\"server\" AutoGenerateColumns=\"false\" 
        DataKeyNames=\"Id\" Caption=\"Details\">
        <Columns>
            <asp:CommandField ShowSelectButton=\"true\" SelectText=\"Select\" />
            <asp:BoundField HeaderText=\"Id\" DataField=\"Id\" />
            <asp:BoundField HeaderText=\"Name\" DataField=\"Name\" />
            <asp:BoundField HeaderText=\"Age\" DataField=\"Age\" />
        </Columns>
    </asp:GridView>

后台代码：

    private List<MyClass> MasterGridViewDataSource
    {
        get { return Session[\"MasterGridViewDataSource\"] as List<MyClass>; }
        set { Session[\"MasterGridViewDataSource\"] = value; }
    }

    private List<int> SelectedIDs
    {
        get { return ViewState[\"SelectedIDs\"] as List<int>; }
        set { ViewState[\"SelectedIDs\"] = value; }
    }

    protected void Page_Init(object sender,EventArgs e)
    {
        MasterGridView.SelectedIndexChanged += MasterGridView_OnSelectedIndexChanged;
    }

    protected void Page_Load(object sender,EventArgs e)
    {
        if (!IsPostBack)
        {
            var masterGridDataSource = GetMasterGridDataSource();
            MasterGridViewDataSource = masterGridDataSource;
            MasterGridView.DataSource = masterGridDataSource;
            MasterGridView.DataBind();

            SelectedIDs = new List<int>();
        }
    }

    private List<MyClass> GetMasterGridDataSource()
    {
        return (from item in Enumerable.Range(1,10)
                select new MyClass { Id = item,Name = string.Format(\"Item #{0}\",item),Age = item })
                .ToList();
    }

    void MasterGridView_OnSelectedIndexChanged(object sender,EventArgs e)
    {
        var selectedId = (int)MasterGridView.SelectedDataKey.Value;
        if (!SelectedIDs.Contains(selectedId))
            SelectedIDs.Add(selectedId);

        DetailsGridView.DataSource = (from item in MasterGridViewDataSource
                                      join id in SelectedIDs on item.Id equals id
                                      select item);
        DetailsGridView.DataBind();
    }

    [Serializable]
    public class MyClass
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }
    }