The method or operation is not implemented error when we set the filter to "StartsWith"

[Alex]

Hi,

We are using RadGridView to display data from the DataTable. In one of the column we have selected "StartsWith" has the filter. After setting the filter if we close and re open the view, we are getting the following error and the application crashes. This is once we load the layout even before Data is loaded.

 

System.NotImplementedException: The method or operation is not implemented.
   at Telerik.Windows.Data.Expressions.FilterOperatorExpressionBuilderBase.GenerateStartsWith(Expression left, Expression right)
   at Telerik.Windows.Data.Expressions.OperatorValueFilterDescriptorExpressionBuilderBase.CreateBodyExpression()
   at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpression()
   at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpression()
   at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpression()
   at Telerik.Windows.Data.ICompositeFilterDescriptorExtensions.GetFilterFunction(ICompositeFilterDescriptor filterDescriptors, Type itemType)
   at Telerik.Windows.Data.QueryableCollectionView.InitializeInternalList(IQueryable view)
   at Telerik.Windows.Data.QueryableCollectionView.CreateInternalList()
   at Telerik.Windows.Data.QueryableCollectionView.get_InternalList()
   at Telerik.Windows.Data.QueryableCollectionView.GetEnumerator()
   at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

 

After digging through the column properties, I found out that FilterMemberType was null. Once I set the property to string type. Its not throwing error anymore.

Please let me know is it the right way to do it or if you have any better solution.

 

Thanks and regards,

Alex

 

 

 

[Yoan]

Hello Alex,

Generally, when the Type of the bound property cannot be automatically discovered by the data engine, you can “help” the column by setting the FilterMemberType property. So, your approach is the correct one.

Regards,
Yoan
Telerik