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Last Updated: 09 May 2025 07:55 by ADMIN

Scheduled for 2025 Q2 (May)

GridView: Distinct values are not displayed when setting the FilterMemberPath to the Date property of a DateTime DataTable column when it contains DBNull.Value

Created by: Stenly

Comments: 1

Category: GridView

Type: Bug Report

GridView: Distinct values are not displayed when setting the FilterMemberPath to the Date property of a DateTime DataTable column when it contains DBNull.Value

Distinct values are not displayed when setting the FilterMemberPath to the Date property of a DateTime DataTable column when it contains DBNull.Value.

Generally, this is present because while the distinct values are generated, we check for the Date property in each row, however, when it reaches a row that has a DBNull.Value value, an exception is thrown because the Date property cannot be found in null.

In Development

Last Updated: 02 May 2025 10:25 by ADMIN

Scheduled for 2025 Q2 (May)

GridView: NullReferenceException when automation peers creation goes over the MaxCachedPeersSize value (10,000) and the item type that populates the ItemsSource uses the 'record' modifier

Created by: Martin Ivanov

Comments: 0

Category: GridView

Type: Bug Report

GridView: NullReferenceException when automation peers creation goes over the MaxCachedPeersSize value (10,000) and the item type that populates the ItemsSource uses the 'record' modifier

NullReferenceException occurs when the the automation peers creation for the rows goes over 10,000 peers (the MaxCachedPeersSize setting of the GridViewDataControlAutomationPeer). The exception occurs only when the 'record' modifier is used in the class definition. For example:

public record class MyClass(int Id)
{
}

The exception stacktrace is:

System.NullReferenceException: 'Object reference not set to an instance of an object.'
peer was null.
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.ClearPeer(Telerik.Windows.Automation.Peers.DataItemAutomationPeer peer)   Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.GetOrCreateItemPeer(object item, int index) Line 288 C#  Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.FindDataItemAutomationPeer(System.Collections.Generic.List<System.Windows.Automation.Peers.AutomationPeer> childPeers) Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Automation.Peers.GridViewRowAutomationPeer.GetChildrenCore()

To work this around use the "class" modifier instead of "record". For example, instead of:

public record class MyClass(int Id)
{
}

Use:

public class MyClass
{
    public int Id { get; set; } 
}

Or alternatively, increase the MaxCachedPeersSize value.