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

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属性 保存全选的项#region 属性 保存全选的项
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protected ArrayList SelectedItems
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{
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get
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{
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if (ViewState["SelectedItems"] == null)
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{
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ViewState["SelectedItems"] = new ArrayList();
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}
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return ViewState["SelectedItems"] as ArrayList;
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}
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set
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{
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ViewState["SelectedItems"] = value;
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}
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}
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/**//// <summary>
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/// 页面加载
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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protected void Page_Load(object sender, EventArgs e)
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{
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SaveSelectedItems();
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if (!IsPostBack)
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{
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if (myGridView.Attributes["SortExpression"] == null)
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{
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myGridView.Attributes["SortExpression"] = "DAID";
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myGridView.Attributes["SortDirection"] = "asc";
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}
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BindDynamicAccountFlowInfo();
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}
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}
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/**//// <summary>
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/// 保存页面选中的项
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/// </summary>
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private void SaveSelectedItems()
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{
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for (int i = 0; i < myGridView.Rows.Count; i++)
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{
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CheckBox tempCheckBox = myGridView.Rows[i].FindControl("chkSelect") as CheckBox;
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string id = myGridView.Rows[i].Cells[0].Text;
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if (SelectedItems.Contains(id) && !tempCheckBox.Checked)
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{
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SelectedItems.Remove(id);
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}
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if (!SelectedItems.Contains(id) && tempCheckBox.Checked)
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{
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SelectedItems.Add(id);
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}
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}
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}
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/**//// <summary>
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/// 行绑定
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
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{
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if (e.Row.RowType == DataControlRowType.DataRow)
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{
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if (e.Row.RowIndex > -1 && SelectedItems.Count > 0)
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{
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CheckBox tempCheckBox = e.Row.FindControl("chkSelect") as CheckBox;
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string id = e.Row.Cells[0].Text;
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if (SelectedItems.Contains(id))
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{
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tempCheckBox.Checked = true;
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}
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else
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{
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tempCheckBox.Checked = false;
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}
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}
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}
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}
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/**//// <summary>
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/// 删除按钮
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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protected void btnDelAll_ServerClick(object sender, EventArgs e)
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{
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string sID = "";//选中删除所有行的id
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foreach (string tempString in SelectedItems)
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{
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sID += tempString + ",";
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}
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if (SelectedItems.Count < 1)
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{
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ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('你没有选择！！！')</script>");
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}
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else
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{
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daDB.DelDynamicAccountFlowinfo(sID.Substring(0, sID.Length - 1));
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}
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if (Cache["dataSource"] != null)
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Cache.Remove("dataSource");//***先清空原有页面缓存
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BindDynamicAccountFlowInfo();
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}
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下面是删除操作代码（DB）：

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public bool DelDynamicAccountFlowinfo(string sID)
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{
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string sqlstr=string.Format("delete from DynamicAccountFlow where DAFID IN({0})", sID);
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conn = Myconn.SqlConnection;
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SqlCommand mycommand = new SqlCommand(sqlstr, conn);
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mycommand.CommandType = CommandType.Text;
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mycommand.CommandText = sqlstr;
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conn.Open();
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mycommand.ExecuteNonQuery();
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conn.Close();
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return true;
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}