This will crash (however this construction is allowed in standart asp.net grid component):
System crashes on Databind with long message
That took some time to me to find the reason of the problem (my current grid is quite complex)
User just need to add empty ItemTemplate. However, it was not easy to find the reason
| <telerik:GridTemplateColumn Visible="false"> |
| <EditItemTemplate> |
| <asp:DropDownList ID="ddCategory" Runat="server" CssClass="GeneralDropDownList"></asp:DropDownList> |
| </EditItemTemplate> |
| </telerik:GridTemplateColumn> |
System crashes on Databind with long message
| System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException: Object reference not set to an instance of an object. |
| at Telerik.Web.UI.GridTemplateColumn.FillValues(IDictionary newValues, GridEditableItem editableItem) |
| at Telerik.Web.UI.GridEditableItem.ExtractValues(IDictionary newValues) |
| at Telerik.Web.UI.GridTableView.ExtractValuesFromItem(IDictionary newValues, GridEditableItem editedItem) |
| at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group) |
| at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls) |
| at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) |
| at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) |
| at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) |
| at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) |
| at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) |
| at System.Web.UI.WebControls.DataBoundControl.PerformSelect() |
| at Telerik.Web.UI.GridTableView.PerformSelect() |
| at System.Web.UI.WebControls.BaseDataBoundControl.DataBind() |
| at Telerik.Web.UI.GridTableView.DataBind() |
| at Telerik.Web.UI.RadGrid.DataBind() |
| at System.Web.UI.Control.DataBindChildren() |
| at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) |
| at System.Web.UI.Control.DataBind() |
| at System.Web.UI.Control.DataBindChildren() |
| at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) |
| at System.Web.UI.Control.DataBind() |
| at Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows) |
| at Telerik.Web.UI.GridItemBuilder.InitializeItem(Int32 dataSourceIndex, String& nextItemHierarchicalIndex, Boolean& itemIsInEditMode) |
| at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group) |
| at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls) |
| at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) |
| at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) |
| at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) |
| at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) |
| at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) |
| at System.Web.UI.WebControls.DataBoundControl.PerformSelect() |
| at Telerik.Web.UI.GridTableView.PerformSelect() |
| at System.Web.UI.WebControls.BaseDataBoundControl.DataBind() |
| at Telerik.Web.UI.GridTableView.DataBind() |
| at Telerik.Web.UI.RadGrid.DataBind() |
| at Sleza4eEngine.LRMup.controls.components.BFfamily.AttachmentsControl.LoadGrid(Boolean AddNew) in D:\Sleza4e\Job\SourceCode\lrmup\src\LRMup\controls\components\BFfamily\main\AttachmentsControl.ascx.cs:line 71 |
| at Sleza4eEngine.LRMup.controls.components.BFfamily.AttachmentsControl.processData(XmlNode dataNode) in D:\Sleza4e\Job\SourceCode\lrmup\src\LRMup\controls\components\BFfamily\main\AttachmentsControl.ascx.cs:line 32 |
| at Sleza4eEngine.LRMup.controls.content.file.LoadGroups(Boolean FilePostBack) in D:\Sleza4e\Job\SourceCode\lrmup\src\LRMup\controls\content\file.ascx.cs:line 329 |
| at Sleza4eEngine.LRMup.controls.content.file.Page_Load(Object sender, EventArgs e) in D:\Sleza4e\Job\SourceCode\lrmup\src\LRMup\controls\content\file.ascx.cs:line 210 |
| at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) |
| at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) |
| at System.EventHandler.Invoke(Object sender, EventArgs e) |
| at System.Web.UI.Control.OnLoad(EventArgs e) |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Control.LoadRecursive() |
| at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) |
| --- End of inner exception stack trace --- |
| at System.Web.UI.Page.HandleError(Exception e) |
| at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) |
| at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) |
| at System.Web.UI.Page.ProcessRequest() |
| at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) |
| at System.Web.UI.Page.ProcessRequest(HttpContext context) |
| at ASP.start_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\a159c958\db1b23ec\App_Web_start.aspx.cdcab7d2.3eyik7my.0.cs:line 0 |
| at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() |
| at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) |
That took some time to me to find the reason of the problem (my current grid is quite complex)
User just need to add empty ItemTemplate. However, it was not easy to find the reason
| <telerik:GridTemplateColumn Visible="false"> |
| <ItemTemplate> |
| </ItemTemplate> |
| <EditItemTemplate> |
| <asp:DropDownList ID="ddCategory" Runat="server" CssClass="GeneralDropDownList"></asp:DropDownList> |
| </EditItemTemplate> |
| </telerik:GridTemplateColumn> |
6 Answers, 1 is accepted
0
Leon
Top achievements
Rank 1
Rank 1
answered on 21 Aug 2008, 08:30 PM
Sergey,
I think I've seen this problem posted before, do you run that with the latest Q2 2008 version? If so, you can submit a bug report to help Telerik fix that!
Thanks for posting the solution and all the best!
~Leon
I think I've seen this problem posted before, do you run that with the latest Q2 2008 version? If so, you can submit a bug report to help Telerik fix that!
Thanks for posting the solution and all the best!
~Leon
0
Mohammed Imaduddin
Top achievements
Rank 1
Rank 1
answered on 23 Jul 2009, 04:53 PM
Thank you Sergey! You have saved my life. I have a pretty complex grid too, and this was causing me a lot of grief. I spent the last 3 hours trying to figure this out, until I read your post. Thank you so much!
This problem is apparently not resolved. I am using the Q1 2009 version.
This problem is apparently not resolved. I am using the Q1 2009 version.
0
Hello Mohammed,
Could you explain what is the exact scenario that is producing the error. You can also open a support ticket and attach to it a sample website which illustrates the issue.
All the best,
Pavel
the Telerik team
Instantly find answers to your questions on the new Telerik Support Portal.
Check out the tips for optimizing your support resource searches.
Could you explain what is the exact scenario that is producing the error. You can also open a support ticket and attach to it a sample website which illustrates the issue.
All the best,
Pavel
the Telerik team
Instantly find answers to your questions on the new Telerik Support Portal.
Check out the tips for optimizing your support resource searches.
0
cheburek
Top achievements
Rank 1
Rank 1
answered on 25 Sep 2009, 03:49 PM
Sergey, thank you so much
You really have save a couple of my head beating of wall.
I had a grid with AllowMultiRowedit="true" AllowAutomaticDeletes="True"
and
calling Delete was cause the same exception. After inserting emty <ItemTemplate/> all works fine.
By the way CustomValidator handler is called properly but in handler I set error message and it does not show after validation because of one more command (EditAll) that come to server after Update command (read as One more server request) so all errors that were found when Update command came are lost on EditAll
You really have save a couple of my head beating of wall.
I had a grid with AllowMultiRowedit="true" AllowAutomaticDeletes="True"
and
| <telerik:GridTemplateColumn ReadOnly="False" |
| UniqueName="Width" SortExpression="Width" HeaderText="Width"> |
| <EditItemTemplate> |
| <asp:TextBox runat="server" id="tbEditWidth" |
| Text='<%# Bind("Width") %>' /> |
| <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" |
| ErrorMessage="Required" |
| ControlToValidate="tbEditWidth" |
| Display="Dynamic" |
| Enabled="True" Visible="True"/> |
| <asp:CustomValidator ID="WidthValidator1" runat="Server" |
| ControlToValidate="tbEditWidth" |
| OnServerValidate="WidthValidator1_ServerValidate" |
| Display="Dynamic" |
| Enabled="True" Visible="True" /> |
| </EditItemTemplate> |
| </telerik:GridTemplateColumn> |
By the way CustomValidator handler is called properly but in handler I set error message and it does not show after validation because of one more command (EditAll) that come to server after Update command (read as One more server request) so all errors that were found when Update command came are lost on EditAll
| Private Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.ItemCommand |
| 'EditAll |
| End Sub |
| Protected Sub WidthValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) |
| If Not IsNumeric(args.Value) Then |
| args.IsValid = False |
| DirectCast(source, CustomValidator).ErrorMessage = "Value must be numeric" |
| End If |
| End Sub |
0
MiroslavStantic
Top achievements
Rank 1
Iron
Rank 1
Iron
answered on 11 Nov 2009, 02:16 PM
I'm using RadControls for ASP.NET AJAX Q2 2009 SP1 and I am seeing the same thing.
If I put a Template column in the grid and set Display="false" and only put an EditTemplate inside it, the grid should not throw a strange exception "Object reference not set to an instance of an object" when Delete command is raised inside the grid (by user clicking a delete button). Simple ObjectDataSource and Automatic operations are used, so it's really easy to recreate. The workaround is to give the grid an empty ItemTemplate: "<ItemTemplate></ItemTemplate>". With this strange behavior grid takes away precious developer time.
Stack trace:
If I put a Template column in the grid and set Display="false" and only put an EditTemplate inside it, the grid should not throw a strange exception "Object reference not set to an instance of an object" when Delete command is raised inside the grid (by user clicking a delete button). Simple ObjectDataSource and Automatic operations are used, so it's really easy to recreate. The workaround is to give the grid an empty ItemTemplate: "<ItemTemplate></ItemTemplate>". With this strange behavior grid takes away precious developer time.
Stack trace:
| System.NullReferenceException: Object reference not set to an instance of an |
| object. at Telerik.Web.UI.GridTemplateColumn.FillValues(IDictionary newValues, |
| GridEditableItem editableItem) at |
| Telerik.Web.UI.GridEditableItem.ExtractValues(IDictionary newValues) at |
| Telerik.Web.UI.GridTableView.ExtractValuesFromItem(IDictionary newValues, |
| GridEditableItem editedItem) at |
| Telerik.Web.UI.GridTableView.PerformDelete(GridEditableItem editedItem, Boolean |
| suppressRebind) at Telerik.Web.UI.GridCommandEventArgs.ExecuteCommand(Object |
| source) at Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e) at |
| System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) at |
| Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) at |
| System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) at |
| System.Web.UI.WebControls.ImageButton.OnCommand(CommandEventArgs e) at |
| System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) |
| at |
| System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String |
| eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler |
| sourceControl, String eventArgument) at |
| System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at |
| System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, |
| Boolean includeStagesAfterAsyncPoint) |
0
Hello Miroslav,
Indeed I was able to replicate the error. I have consulted with our developers regarding this issue and they informed me that you should always add an ItemTemplate in the TemplateColumn even if it is empty. This seems to be a limitation of the current implementation.
Kind regards,
Pavel
the Telerik team
Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.
Indeed I was able to replicate the error. I have consulted with our developers regarding this issue and they informed me that you should always add an ItemTemplate in the TemplateColumn even if it is empty. This seems to be a limitation of the current implementation.
Kind regards,
Pavel
the Telerik team
Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.