我添加了UpdatePanel以包括一个网格，以反映一些更改。但是，当我单击页面上的其他按钮以更新一些数据时，回发后网格将消失。
我尝试删除UpdatePanel，然后将显示网格并在网格上显示数据。
这是我的代码。
主要是，当页面首次进入时，将显示带有数据的网格。但是，当我单击页面上的按钮以更新一些数据时，更新应显示在网格上。该页面是回发的，但是，当我这样做时，将不会显示网格。
我尝试删除aspx中的UpdatePanel，然后单击页面上的按钮以更新数据时，网格将再次显示。似乎UpdatePanel已使网格消失。单击页面上的按钮并发回后，我需要保留UpdatePanel并使网格不消失。
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<telerik:RadGrid ID="uiGrid" runat="server"
AutoGenerateColumns="false" ItemStyle-BackColor="White" AlternatingItemStyle-BackColor="White"
OnDataBound="uiGrid_DataBound" OnItemDataBound="uiGrid_ItemDataBound" OnNeedDataSource="uiGrid_NeedDataSource"
ClientSettings-ClientEvents-OnKeyPress="keyPressInGrid"
Width="100%" Height="500" EnableViewState="true">
<ClientSettings>
<Scrolling CountGroupSplitterColumnAsFrozen="false" AllowScroll="true" UseStaticHeaders="True" SaveScrollPosition="true" FrozenColumnsCount="3"></Scrolling>
</ClientSettings>
<MasterTableView>
<GroupByExpressions>
<telerik:GridGroupByExpression>
<SelectFields>
<telerik:GridGroupByField FieldAlias="<%$ Resources:Resource,Group %>" FieldName="IndicatorParentName"></telerik:GridGroupByField>
</SelectFields>
<GroupByFields>
<telerik:GridGroupByField FieldName="IndicatorParentName" SortOrder="Ascending"></telerik:GridGroupByField>
</GroupByFields>
</telerik:GridGroupByExpression>
</GroupByExpressions>
<Columns>
<telerik:GridBoundColumn DataField="IndicatorName" HeaderText="<%$ Resources:Resource,Indicator %>" UniqueName="IndicatorName"
SortExpression="IndicatorName" DataType="System.String" ItemStyle-Wrap="false">
</telerik:GridBoundColumn>
<telerik:GridTemplateColumn>
<ItemTemplate>
<asp:HiddenField ID="uiIndicatorID" runat="server" Value='<%#Eval("IndicatorID")%>' />
<asp:HiddenField ID="uiIndicatorName" runat="server" Value='<%#Eval("IndicatorName")%>' />
<asp:ImageButton ID="uiTipsButton" runat="server" ImageUrl="images/information-icon.png?20170703" Width="16" Height="16" />
</ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridTemplateColumn HeaderText="<%$ Resources:Resource,Unit %>">
<ItemTemplate>
<asp:Label ID="uiUnit" runat="server" />
</ItemTemplate>
</telerik:GridTemplateColumn>
</Columns>
</MasterTableView>
</telerik:RadGrid>
</ContentTemplate>
</asp:UpdatePanel>
这是背后的代码：
protected void uiImport_Click(object sender, EventArgs e)
{
// clear message
uiErrorMsg.Text = "";
uiSuccessMsg2.Text = "";
StringBuilder message = new StringBuilder(1024);
HttpResponseMessage result = null;
if (uiUpload.UploadedFiles.Count > 0)
{
result = ImportData();
if (result.IsSuccessStatusCode)
{
message.Append(Convert.ToString(HttpContext.GetGlobalResourceObject("Resource", "Message_Import_Data_Successful")));
message.Append(Environment.NewLine);
try
{
_usageData.Dispose();
_usageData = null;
}
catch { }
BindGrid(true); // refresh grid.
// update task modified by and date
bool hasError = false;
Common.Systems.Sustainability.Constants.ApprovalStatuses status = Common.Systems.Sustainability.Constants.ApprovalStatuses.Undefined;
bool isApprovedOrRejected = WorkflowUtil.IsApprovedOrRejected(_taskID.Value, ref status);
if (isApprovedOrRejected)
{
// re-cache data for dashboards
int companyID = Common.WebUtil.GetCompanyID();
Thread childThread = new Thread(() => Util.ReCacheForDashboards(Cache, companyID));
childThread.Start();
}
else
{
UpdateTask(ref hasError);
}
}
else
{
string msg = Convert.ToString(HttpContext.GetGlobalResourceObject("Resource", "Message_Unable_To_Import_Data"));
message.Append(msg);
message.Append(Environment.NewLine);
string resultMessage = result.Content.ReadAsStringAsync().Result;
if (resultMessage.IndexOf("ExceptionMessage", StringComparison.OrdinalIgnoreCase) > -1)
{
resultMessage = resultMessage.Replace("\\r\\n", "<br />");
Logger.Log(string.Format("Error occurs in the '{0}.{1}' method.{2}{3}"
, System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.ToString()
, System.Reflection.MethodBase.GetCurrentMethod().Name
, Environment.NewLine
, resultMessage));
}
else
{
message.Append(Common.Util.ReformatMessage(resultMessage));
}
} // end if
} // end if
if (result != null)
{
if (result.IsSuccessStatusCode)
{
uiSuccessMsg2.Text = message.Replace(Environment.NewLine, "<br />").ToString();
}
else
{
// show error message on web.
//uiErrorMsg.Text = message.Replace(Environment.NewLine, "<br />").ToString();
//uiPanel2.Alert(message.ToString());
uiReportPanel.Alert(message.ToString());
} // end if
} // end if
}
private void BindGrid(bool performDataBind = true)
{
DataTable locationsTable = null;
DataTable indicatorsTable = null;
try
{
// try to get delegation, location and indicators information, it contains sequence order of locations and indicators
// order numbers will be using for sorting in code below
try
{
_delegation = GetDelegationByTaskID(_taskID.Value);
int delegationID = Convert.ToInt32(_delegation.Tables[0].Rows[0][Common.Systems.Sustainability.Constants.Delegation.ID]);
_delegationLocationsAndIndicators = GetDelegationLocationsAndIndicatorsByDelegationID(delegationID);
}
catch { }
// remove all columns
for (int i = 3; i < uiGrid.MasterTableView.Columns.Count; i++)
{
GridColumn col = uiGrid.MasterTableView.Columns[i];
uiGrid.MasterTableView.Columns.Remove(col);
i--;
}
DataSet usage = GetUsageData();
//using (DataSet usage = GetUsageData())
//{
{
locationsTable = usage.Tables[0].DefaultView.ToTable(true, new string[] {
Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.LocationID
, Common.Systems.Sustainability.Constants.Location.LocationName
}
);
// As requested by user in 2016-07, sorting location and indicator based on delegation selected ordering.
if (_delegationLocationsAndIndicators != null)
{
locationsTable.Columns.Add(Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForLocation, Type.GetType("System.Int32"));
foreach (DataRow dr in locationsTable.Rows)
{
DataRow[] dli = _delegationLocationsAndIndicators.Tables[0].Select(string.Format("{0} = {1}"
, Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.LocationID
, dr[ .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.LocationID]
));
if (dli.Length > 0)
{
int? sequence = .Common.Util.TryToConvertToInt32(dli[0], .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForLocation);
if (sequence != null)
{
dr[ .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForLocation] = sequence.Value;
}
}
}
locationsTable.DefaultView.Sort = .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForLocation;
DataTable temp = locationsTable.DefaultView.ToTable();
locationsTable.Dispose();
locationsTable = temp;
}
// append locations to grid view
int i = 0;
foreach (DataRow dr in locationsTable.Rows)
{
string locationID = Convert.ToString(dr["LocationID"]);
string locationName = Convert.ToString(dr["LocationName"]);
GridTemplateColumn tplColumn = new GridTemplateColumn();
tplColumn.ItemTemplate = new UsageColumnTemplate(locationName, i.ToString(), locationID, _currencies);
tplColumn.HeaderText = locationName;
uiGrid.MasterTableView.Columns.Add(tplColumn);
i++;
}
}
// filter out indicators if no location associated
{
indicatorsTable = usage.Tables[0].DefaultView.ToTable(true, new string[] {
.Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.IndicatorID
, .Common.Systems.Sustainability.Constants.Indicator.IndicatorName
, "IndicatorParentName" // Added by HC on 2016-06-08, as requested by users, use parent indicator name as group on the grid view.
}
);
// As requested by user in 2016-07, sorting location and indicator based on delegation selected ordering.
if (_delegationLocationsAndIndicators != null)
{
indicatorsTable.Columns.Add( .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForIndicator, Type.GetType("System.Int32"));
foreach (DataRow dr in indicatorsTable.Rows)
{
DataRow[] dli = _delegationLocationsAndIndicators.Tables[0].Select(string.Format("{0} = {1}"
, .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.IndicatorID
, dr[ .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.IndicatorID]
));
if (dli.Length > 0)
{
int? sequence = .Common.Util.TryToConvertToInt32(dli[0], .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForIndicator);
if (sequence != null)
{
dr[ .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForIndicator] = sequence.Value;
}
}
}
indicatorsTable.DefaultView.Sort = .Common.Systems.Sustainability.Constants.DelegationLocationAndIndicator.SequenceForIndicator;
DataTable temp = indicatorsTable.DefaultView.ToTable();
indicatorsTable.Dispose();
indicatorsTable = temp;
}
// bind indicators to grid view
uiGrid.DataSource = indicatorsTable;
//if (performDataBind)
//uiGrid.Rebind();
}
//} // end using
}
finally
{
if (locationsTable != null)
{
locationsTable.Dispose();
locationsTable = null;
}
if (indicatorsTable != null)
{
indicatorsTable.Dispose();
indicatorsTable = null;
}
}
}
答案 0 :(得分：0)
尝试一下：
...
</telerik:RadGrid>
</ContentTemplate>
<triggers>
<asp:asyncpostbacktrigger controlid="TheButtonIdThatUpdateGrid" />
</triggers>
</asp:UpdatePanel>