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Issue Refreshing Column Filters

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GridView

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Matthew asked on 01 Feb 2012, 09:54 PM

Hello,

I have a RadGridView with an ObservableCollection as it's ItemsSource.

The ObservableCollection holds a collection of objects similar in relation to sports players and teams.

where the Player object looks like:

ObservableCollection<Player> _players;

// Psuedo-code Object Descriptions

Player

{

UniqueIdentifier (Guid)

string Name

Guid TeamID (FK to Team's UniqueIdentifier)

string Position

int Number

//etc.

}

Team

{

UniqueIdentifier (Guid)

string Name

string Location

//etc.

}

<telerik:RadGridView>

<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn Header="Team"

DataMemberBinding="{Binding Team.Name}" />

<telerik:GridViewDataColumn Header="Name"

DataMemberBinding="{Binding Name}" />

<telerik:GridViewDataColumn Header="Position"

DataMemberBinding="{Binding Position}" />

<telerik:GridViewDataColumn Header="Number"

DataMemberBinding="{Binding Number}" />

</telerik:RadGridView.Columns>

</telerik:RadGridView>

The RadGrid I have is displaying columns for all of the properties similar to the XAML posted above.

I query for all the Players, Including the Navigation Property for Team, asynchronously. In the callback I call _players.Clear() and Add the results from the query to _players.

After the first query the column filters on the RadGridView work fine. When I perform the Load operation again, and then click on the Filter icon on the Column with Header == "Team" the screen goes blank and I get this message in my output window:
"Binding cannot be changed after it has been used."

I've also seen this error when the site is deployed:

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; BRI/2; MS-RTC LM 8)

Timestamp: Mon, 30 Jan 2012 20:08:56 UTC

Message: Unhandled Error in Silverlight Application [Binding_CannotBeChangedAfterUse]

Arguments:

Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.0.60831.0&File=System.Windows.dll&Key=Binding_CannotBeChangedAfterUse
at System.Windows.Data.BindingBase.CheckSealed()

at Telerik.Windows.Data.DataFieldDescriptorExtensions.PrepareBinding(IDataFieldDescriptor fieldDescriptor, Binding memberBinding)

at Telerik.Windows.Data.DataFieldDescriptorExtensions.CreateConvertedAndFormattedValueFunc(IDataFieldDescriptor fieldDescriptor, Func`2 func)

at Telerik.Windows.Controls.GridView.FilteringViewModel.InitializeConvertedAndFormattedValueFunc()

at Telerik.Windows.Controls.GridView.FilteringViewModel.CreateDistinctValueViewModel(Object distinctValue)

at Telerik.Windows.Controls.GridView.DistinctValueViewModelCollection.AddRangeFromSource(IEnumerable source)

at Telerik.Windows.Controls.GridView.DistinctValueViewModelCollection.SetSource(IEnumerable source, Func`2 createDistinctValueCallback)

I managed to work around this problem by creating a property (and binding to it instead) on my Player BO similar to:

public string TeamName

{

get { return this.Team == null ? string.Empty : this.Team.Name; }

}

Issue Refreshing Column Filters

2 Answers, 1 is accepted