GridView CheckBox当翻页时保存选中的项(viewstate)

  1  属性 保存全选的项#region  属性 保存全选的项
  2
  3    protected ArrayList SelectedItems
  4    {
  5        get
  6        {
  7            if (ViewState["SelectedItems"] == null)
  8            {
  9                ViewState["SelectedItems"] = new ArrayList();
 10            }
 11
 12            return ViewState["SelectedItems"] as ArrayList;
 13        }
 14        set
 15        {
 16            ViewState["SelectedItems"] = value;
 17        }
 18    }
 19  /**//// <summary>
 20    /// 页面加载
 21    /// </summary>
 22    /// <param name="sender"></param>
 23    /// <param name="e"></param>
 24    protected void Page_Load(object sender, EventArgs e)
 25    {
 26  SaveSelectedItems();
 27        if (!IsPostBack)
 28        {
 29            if (myGridView.Attributes["SortExpression"] == null)
 30            {
 31                myGridView.Attributes["SortExpression"] = "DAID";
 32                myGridView.Attributes["SortDirection"] = "asc";
 33            }
 34            BindDynamicAccountFlowInfo();
 35        }
 36  }
 37  /**//// <summary>
 38    /// 保存页面选中的项
 39    /// </summary>
 40    private void SaveSelectedItems()
 41    {
 42        for (int i = 0; i < myGridView.Rows.Count; i++)
 43        {
 44            CheckBox tempCheckBox = myGridView.Rows[i].FindControl("chkSelect") as CheckBox;
 45            string id = myGridView.Rows[i].Cells[0].Text;
 46
 47            if (SelectedItems.Contains(id) && !tempCheckBox.Checked)
 48            {
 49                SelectedItems.Remove(id);
 50            }
 51            if (!SelectedItems.Contains(id) && tempCheckBox.Checked)
 52            {
 53                SelectedItems.Add(id);
 54            }
 55        }
 56    }
 57 /**//// <summary>
 58    /// 行绑定
 59    /// </summary>
 60    /// <param name="sender"></param>
 61    /// <param name="e"></param>
 62    protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
 63    {
 64  if (e.Row.RowType == DataControlRowType.DataRow)
 65        {
 66            if (e.Row.RowIndex > -1 && SelectedItems.Count > 0)
 67            {
 68                CheckBox tempCheckBox = e.Row.FindControl("chkSelect") as CheckBox;
 69                string id = e.Row.Cells[0].Text;
 70                if (SelectedItems.Contains(id))
 71                {
 72                    tempCheckBox.Checked = true;
 73                }
 74                else
 75                {
 76                    tempCheckBox.Checked = false;
 77                }
 78            }
 79        }
 80
 81    }
 82 /**//// <summary>
 83    /// 删除按钮
 84    /// </summary>
 85    /// <param name="sender"></param>
 86    /// <param name="e"></param>
 87    protected void btnDelAll_ServerClick(object sender, EventArgs e)
 88    {
 89        string sID = "";//选中删除所有行的id
 90
 91        foreach (string tempString in SelectedItems)
 92        {
 93            sID += tempString + ",";
 94        }
 95        if (SelectedItems.Count < 1)
 96        {
 97            ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('你没有选择！！！')</script>");
 98        }
 99        else
100        {
101            daDB.DelDynamicAccountFlowinfo(sID.Substring(0, sID.Length - 1));
102       }
103        if (Cache["dataSource"] != null)
104            Cache.Remove("dataSource");//***先清空原有页面缓存
105
106        BindDynamicAccountFlowInfo();
107    }
108下面是删除操作代码（DB）：

 1 public bool DelDynamicAccountFlowinfo(string sID)
 2    {
 3        string sqlstr=string.Format("delete from DynamicAccountFlow where DAFID IN({0})", sID);
 4  conn = Myconn.SqlConnection;
 5        SqlCommand mycommand = new SqlCommand(sqlstr, conn);
 6        mycommand.CommandType = CommandType.Text;
 7        mycommand.CommandText = sqlstr;
 8        conn.Open();
 9        mycommand.ExecuteNonQuery();
10        conn.Close();    
11    return true;
12    }