DataGrid/Gridview中的按钮反选事件与NamingContainer(命名容器)
DataGrid中想实现这样的效果:
根据某一字段列的值动态改变按钮的文本,比如:
点击按钮列,自动更新某列原为0的值为1,并将按钮列的文本改为“置0”,
再按下,自动更新某列原为1的值为0,并将按钮列的文本改为“置1”,
最终通过NamingContainer,实现! 方法如下 :
<asp:DataGrid id="DataGrid1" runat="server" AutoGenerateColumns="False"> <Columns> <asp:BoundColumn DataField="HonoreeID" HeaderText="ID"></asp:BoundColumn> <asp:BoundColumn DataField="status" HeaderText="状态"> <HeaderStyle Width="300px"></HeaderStyle> </asp:BoundColumn> <asp:TemplateColumn HeaderText="状态是否为0"> <HeaderStyle HorizontalAlign="Center" Width="10%"></HeaderStyle> <ItemStyle HorizontalAlign="Center"></ItemStyle> <ItemTemplate> <asp:Label id="lb" runat="server" Visible="false" Text='<%# ((DataBinder.Eval(Container, "DataItem.status", "{0}"))=="0")?"是":"<font color=red>否</font>" %>'> </asp:Label> <asp:Button ID="changeState" Runat="server" Text='<%# ((DataBinder.Eval(Container, "DataItem.status", "{0}"))=="0")?"转为1":"转为0" %>'> </asp:Button> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> |
后台:
protected System.Web.UI.WebControls.DataGrid DataGrid1; public int KeyID { get { object o =ViewState ["KeyID"]; if(o!=null) { return int.Parse(ViewState ["KeyID"].ToString()); } else { return 0; } } set { ViewState ["KeyID"] = value; } } public int RowState { get { return int.Parse(ViewState ["RowState"].ToString()); } set { ViewState ["RowState"] = value; } } private void Page_Load(object sender, System.EventArgs e) { if(IsPostBack) {return ; } getData(); } private void getData() { //SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["DsnPubs"]); SqlConnection con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["Mblog"]); SqlCommand cmd; con.Open(); cmd = new SqlCommand("select * from dbo.Honoree", con); DataGrid1.DataSource = cmd.ExecuteReader(); DataGrid1.DataBind(); con.Close(); } private bool UpdateData(int ID,int OldState) { SqlConnection con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["Mblog"]); SqlCommand cmd; con.Open(); try { string strSql="Update Honoree set Status={0} where HonoreeID={1}"; strSql=string.Format(strSql,(OldState==0?1:0).ToString(),ID.ToString()); cmd = new SqlCommand(strSql, con); cmd.ExecuteNonQuery(); cmd.Dispose(); return true; } catch { return false; } finally { con.Close(); con.Dispose(); } return false; } Web 窗体设计器生成的代码 private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { if(e.Item.ItemType==ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { Button b=(Button)e.Item.FindControl("changeState"); if(b!=null) { b.Click+=new EventHandler(b_Click); } } } private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { } private void b_Click(object sender, EventArgs e) { Button but = (Button)sender; DataGrid dg = (DataGrid)but.NamingContainer.NamingContainer; //此处是关键!!即找到包含按钮的命名容器的上层命名容器 if(dg == null) return; DataGridItem di =(DataGridItem)but.NamingContainer; TableCell key= (TableCell)di.Cells[0]; TableCell state= (TableCell)di.Cells[1]; KeyID=(key==null)?0:int.Parse(key.Text); RowState=(state==null)?0:int.Parse(state.Text); Response.Write(UpdateData(this.KeyID,this.RowState).ToString()); getData(); } |