更新面板的问题
本文关键字：问题 更新 | 更新日期: 2023-09-27 18:30:55
我有一个问题，例如，当我删除一个项目时，它会从数据库中删除，很好地使用 bindGridView（），但不刷新屏幕...我做错了什么？
另一个问题是，例如，当我删除一个项目时，我想显示成功消息，但也没有使用更新面板刷新。
是同样的问题这是我的代码：
<asp:UpdatePanel ID="UpdatePanelListaUsers" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:GridView ID="gridviewListUsers" runat="server" AutoGenerateColumns="false" OnRowCreated="OnRowCreated"
AllowPaging="True" AllowSorting="True" OnSorting="OnSort" DataKeyNames="Id" PageSize="2"
CssClass="cssTable" BorderWidth="0" Width="900px" AlternatingRowStyle-CssClass="alternate-row"
OnRowCommand="gridviewListUsers_RowCommand"
EmptyDataText="Não existe utilizadores..."
onpageindexchanging="gridviewListUsers_PageIndexChanging">
<PagerStyle HorizontalAlign="Right" Font-Bold="true" Font-Size="X-Large" ForeColor="black" />
<PagerSettings Mode="Numeric" />
<Columns>
<asp:BoundField HeaderStyle-CssClass="table-header-repeat line-left minwidth-1" HeaderText="Nome"
DataField="Name" SortExpression="Name" />
<asp:BoundField HeaderStyle-CssClass="table-header-repeat line-left minwidth-1" HeaderText="Username"
DataField="Username" SortExpression="Username" />
<asp:BoundField HeaderStyle-CssClass="table-header-repeat line-left" HeaderText="Email"
DataField="Email" SortExpression="Email" />
<asp:TemplateField ItemStyle-CssClass="options-width" HeaderStyle-CssClass="table-header-options line-left">
<HeaderTemplate>
<a href="">Opções</a></HeaderTemplate>
<ItemTemplate>
<asp:LinkButton ID="lnkEdit" CommandArgument='<%# ((GridViewRow) Container).RowIndex %>' CssClass="icon-1 info-tooltip"
CommandName="edit" ToolTip="Editar" runat="server"></asp:LinkButton>
<asp:LinkButton ID="lnkDelete" CommandArgument='<%# ((GridViewRow) Container).RowIndex %>' CssClass="icon-2 info-tooltip"
CommandName="delete" ToolTip="Remover" runat="server"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
和
<asp:UpdatePanel ID="UpdatePanelMensagens" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:Panel ID="pnlMessageRed" Visible="false" runat="server">
<!-- start message-red -->
<div id="message-red">
<table border="0" width="100%" cellpadding="0" cellspacing="0">
<tr>
<td class="red-left">
Erro. Ficou gravado a informação do erro, tente novamente
</td>
<td class="red-right">
<a class="close-red">
<img src="../images/table/icon_close_red.gif" alt="" /></a>
</td>
</tr>
</table>
</div>
<!-- end message-red -->
</asp:Panel>
<asp:Panel ID="pnlMessageBlue" Visible="false" runat="server">
<!-- start message-blue -->
<div id="message-blue">
<table border="0" width="100%" cellpadding="0" cellspacing="0">
<tr>
<td class="blue-left">
<asp:Label ID="lblSucesso" runat="server"></asp:Label>
</td>
<td class="blue-right">
<a class="close-blue">
<img src="../images/table/icon_close_blue.gif" alt="" /></a>
</td>
</tr>
</table>
</div>
<!-- end message-blue -->
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
这是网格视图代码
private void bindGridView()
{
String strSort = String.Empty;
if (null != m_strSortExp &&
String.Empty != m_strSortExp)
{
strSort = String.Format("{0} {1}", m_strSortExp, (m_SortDirection == SortDirection.Descending) ? "DESC" : "ASC");
}
DataView dv = new DataView(m_dsUsers.Tables[0], String.Empty, strSort, DataViewRowState.CurrentRows);
gridviewListUsers.DataSource = dv;
gridviewListUsers.DataBind();
UpdatePanelListaUsers.Update();
}
protected void OnSort(object sender, GridViewSortEventArgs e)
{
// There seems to be a bug in GridView sorting implementation. Value of
// SortDirection is always set to "Ascending". Now we will have to play
// little trick here to switch the direction ourselves.
if (String.Empty != m_strSortExp)
{
if (String.Compare(e.SortExpression, m_strSortExp, true) == 0)
{
m_SortDirection =
(m_SortDirection == SortDirection.Ascending) ? SortDirection.Descending : SortDirection.Ascending;
}
}
ViewState["_Direction_"] = m_SortDirection;
ViewState["_SortExp_"] = m_strSortExp = e.SortExpression;
this.bindGridView();
}
void AddSortImage(GridViewRow headerRow)
{
Int32 iCol = GetSortColumnIndex(m_strSortExp);
if (-1 == iCol)
{
return;
}
// Create the sorting image based on the sort direction.
Image sortImage = new Image();
if (SortDirection.Ascending == m_SortDirection)
{
sortImage.ImageUrl = "~/images/table/dwn.gif";
sortImage.AlternateText = "Ordem Ascendente";
}
else
{
sortImage.ImageUrl = "~/images/table/up.gif";
sortImage.AlternateText = "Ordem Descendente";
}
// Add the image to the appropriate header cell.
headerRow.Cells[iCol].Controls.Add(sortImage);
}
// This is a helper method used to determine the index of the
// column being sorted. If no column is being sorted, -1 is returned.
int GetSortColumnIndex(String strCol)
{
foreach (DataControlField field in gridviewListUsers.Columns)
{
if (field.SortExpression == strCol)
{
return gridviewListUsers.Columns.IndexOf(field);
}
}
return -1;
}
protected void gridviewListUsers_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "delete")
{
try
{
//obter o id
int index = int.Parse((string)e.CommandArgument);
string key = gridviewListUsers.DataKeys[index]["Id"].ToString();
//apagar o utilizador
Project_BLL.Users.RemoveUser(Convert.ToInt32(key));
//mensagem de sucesso
pnlMessageRed.Visible = false;
pnlMessageBlue.Visible = true;
lblSucesso.Text = "Utilizador adicionado com sucesso. A reencaminhar...";
//força o update dos users, e nao da cache
bindGridView();
GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
LinkButton lb = (LinkButton)row.FindControl("lnkDelete");
if (lb != null)
{
ScriptManager.GetCurrent(this).RegisterAsyncPostBackControl(lb);
}
ScriptManager.RegisterStartupScript(this, this.GetType(), "alertUser", "alert('deleted');", true);
}
catch (Exception er)
{
pnlMessageRed.Visible = true;
pnlMessageBlue.Visible = false;
}
}
else if (e.CommandName == "edit")
{
try
{
int index = int.Parse((string)e.CommandArgument);
string key = gridviewListUsers.DataKeys[index]["Id"].ToString();
Response.Redirect("EditarUtilizador.aspx?id=" + key);
}
catch (Exception)
{
pnlMessageRed.Visible = true;
pnlMessageBlue.Visible = false;
}
}
}
protected void gridviewListUsers_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gridviewListUsers.PageIndex = e.NewPageIndex;
gridviewListUsers.SelectedIndex = -1;
bindGridView(); // Call bind here
}
第二个问题：从代码隐藏注册脚本
protected void gridviewListUsers_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "delete")
{
//your code
ScriptManager.RegisterStartupScript(this, this.GetType(), "alertUser", "alert('deleted');", true);
}
}
当你确定你的循环进入CommandName="delete"时，javascript警报方法绝对应该调用。
第一个问题：在 UpdatePanel 中设置 UpdateMode="Conditional"，并在代码隐藏中使用以下方法：
public UpdatePanelUpdateMode UpdateMode
{
get { return this.UpdatePanelListaUsers.UpdateMode; }
set { this.UpdatePanelListaUsers.UpdateMode = value; }
}
public void Update()
{
this.UpdatePanelListaUsers.Update();
//your girdview bind method.
bindGridView()
}
现在只需调用bindGridView（）任何你想要获得刷新更新面板的地方。
刚刚将 CommandName 更改为 myEdit 和 myDelete（就像 Ashwini Verma 之前建议的那样），现在它可以工作了。
然后我用谷歌搜索它找到原因，似乎这些词是保留的
http://www.mindfiresolutions.com/Issue-with-OnRowCommand-event-of-GridView-while-using-reserve-words-in-CommandName-property-935.php