工作小结（十七）－GridView 翻页后保存CheckBox列的选中状态

后台：

 1翻页后保存CheckBox列的选中状态#region 翻页后保存CheckBox列的选中状态
 2
 3    /**//// <summary>
 4    /// 获取或设置选中项的集合
 5    /// </summary>
 6    protected ArrayList SelectedItems
 7    {
 8        get
 9        {
10            return (ViewState["mySelectedItems"] != null) ? (ArrayList)ViewState["mySelectedItems"] : null;
11        }
12        set
13        {
14            ViewState["mySelectedItems"] = value;
15        }
16    }
17    /**//// <summary>
18    /// 从当前页收集选中项的情况
19    /// </summary>
20    protected void CollectSelected()
21    {
22        ArrayList selectedItems = null;
23        if (this.SelectedItems == null)
24            selectedItems = new ArrayList();
25        else
26            selectedItems = this.SelectedItems;
27
28        for (int i = 0; i < this.gridNodesInfo.Rows.Count; i++)
29        {
30            string id = this.gridNodesInfo.Rows[i].Cells[1].Text;
31            CheckBox cb = this.gridNodesInfo.Rows[i].FindControl("chkDo") as CheckBox;
32            if (selectedItems.Contains(id) && !cb.Checked)
33                selectedItems.Remove(id);
34            if (!selectedItems.Contains(id) && cb.Checked)
35                selectedItems.Add(id);
36        }
37        this.SelectedItems = selectedItems;
38    }
39
40    protected void gridNodesInfo_DataBinding(object sender, EventArgs e)
41    {
42        //在每一次重新绑定之前，需要调用CollectSelected方法从当前页收集选中项的情况
43        CollectSelected();
44    }
45    protected void gridNodesInfo_RowDataBound(object sender, GridViewRowEventArgs e)
46    {
47        //这里的处理是为了回显之前选中的情况
48        if (e.Row.RowIndex > -1 && this.SelectedItems != null)
49        {
50            DataRowView row = (DataRowView)e.Row.DataItem;
51            CheckBox cb = (CheckBox)e.Row.FindControl("chkDo");
52            if (this.SelectedItems.Contains(row["nodeid"].ToString()))
53                cb.Checked = true;
54            else
55                cb.Checked = false;
56        }
57    }
58    #endregion
59
60

前台：

 1<asp:GridView ID="gridNodesInfo" runat="server" AutoGenerateColumns="False" Width="100%"  PageSize="5" AllowPaging="true" EmptyDataText="没有数据" OnPageIndexChanging="gridNodesInfo_PageIndexChanging" OnDataBinding="gridNodesInfo_DataBinding" OnRowDataBound="gridNodesInfo_RowDataBound">
 2<Columns>
 3     <asp:TemplateField>
 4         <ItemTemplate>
 5               <asp:CheckBox ID="chkDo" runat="server" Style="position: relative; left: 2px; top: 2px;" />
 6         </ItemTemplate>
 7     </asp:TemplateField>
 8     <asp:BoundField DataField="nodeid" HeaderText="节点ID" />
 9          <asp:BoundField DataField="nodeName" HeaderText="节点名" />
10          <asp:BoundField DataField="parentid" HeaderText="父节点ID" />
11          <%--<asp:BoundField DataField="parentname" HeaderText="父节点名" />--%>
12          <asp:BoundField DataField="IsNull" HeaderText="是否为空" />
13</Columns>
14<HeaderStyle CssClass="GridView_Head" />
15<AlternatingRowStyle CssClass="GridView_Alter" />
16<RowStyle CssClass="GridView_Row" />
17</asp:GridView>
18
19