工作小结（十七）－GridView 翻页后保存CheckBox列的选中状态

后台：

代码

 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：

代码

 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