Problem filtering template column

[Dmitry]

Hello,
I have a template column which contains a lookup label. Label takes text from dictionary by ID contained in column. Column also has a templated filter which contains a combobox. When I select new item from dropdown, filter command fires and column must be filtered by combobox's ItemValue which is GUID. I  must say there is an extension method in my solution called ToGuid() which I use to convert string values. And now, when filtering command passes to server, I get the following error:

Sys.WebForms.PageRequestManagerServerErrorException: No applicable method 'ToGuid' exists in type 'Convert' (at index 9) в Telerik.Web.UI.ExpressionParser.ParseMemberAccess(Type type, Expression instance) в Telerik.Web.UI.ExpressionParser.ParseTypeAccess(Type type) в Telerik.Web.UI.ExpressionParser.ParseIdentifier() в Telerik.Web.UI.ExpressionParser.ParsePrimary() в Telerik.Web.UI.ExpressionParser.ParseUnary() в Telerik.Web.UI.ExpressionParser.ParseMultiplicative() в Telerik.Web.UI.ExpressionParser.ParseAdditive() в Telerik.Web.UI.ExpressionParser.ParseComparison() в Telerik.Web.UI.ExpressionParser.ParseLogicalAnd() в Telerik.Web.UI.ExpressionParser.ParseLogicalOr() в Telerik.Web.UI.ExpressionParser.ParseExpression() в Telerik.Web.UI.ExpressionParser.ParseParenExpression() в Telerik.Web.UI.ExpressionParser.ParsePrimary() в Telerik.Web.UI.ExpressionParser.ParseUnary() в Telerik.Web.UI.ExpressionParser.ParseMultiplicative() в Telerik.Web.UI.ExpressionParser.ParseAdditive() в Telerik.Web.UI.ExpressionParser.ParseComparison() в Telerik.Web.UI.ExpressionParser.ParseLogicalAnd() в Telerik.Web.UI.ExpressionParser.ParseLogicalOr() в Telerik.Web.UI.ExpressionParser.ParseExpression() в Telerik.Web.UI.ExpressionParser.Parse(Type resultType) в Telerik.Web.UI.GridDynamicQueryable.Where(IQueryable source, String predicate, Object[] values) в Telerik.Web.UI.GridDataTableFromEnumerable.FillData35() в Telerik.Web.UI.GridDataTableFromEnumerable.FillData() в Telerik.Web.UI.GridResolveEnumerable.EnsureInitialized() в Telerik.Web.UI.GridEnumerableFromDataView..ctor(GridTableView owner, DataView dataView, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields, Boolean enableSplitHeaderText) в Telerik.Web.UI.GridDataSourceHelper.CreateGridEnumerable(GridTableView owner, IEnumerable enumerable, Boolean caseSensitive, Boolean autoGenerateColumns, GridColumnCollection presentColumns, String[] additionalField, Boolean retrieveAllFields, Boolean enableSplitHeaderText) в Telerik.Web.UI.GridTableView.get_ResolvedDataSource() в Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) в System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) в System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) в Telerik.Web.UI.GridTableView.PerformSelect() в Telerik.Web.UI.GridTableView.DataBind() в Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e) в System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) в Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) в System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) в Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) в Telerik.Web.UI.RadGrid.RaisePostBackEvent(String eventArgument) в System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I'm not sure whether this is an error in your code or mine or whatever else. Can you please check this out?
Thank you.

[Tsvetina]

Hello Dmitry,

Try turning AJAX temporarily off and you will get the exception to fire in code, so you can see where exactly it happens and why the method does not get called properly. In other words, the PageRequestManagerServerErrorException is a server exception wrapped by ajax coming as a client error. When you get it to fire in code, you will be able to debug it and see its cause.

I assume the problem indeed comes from your custom code but if you cannot track it down, you could post your grid declaration and the problematic part of code here for us to take a look at.

Best wishes,
Tsvetina
the Telerik team