I set the GridColumn DisplayFormat="{0: yyyy-MM-dd}" and the data reflects that format. The default filter control doesn't. How can I make the control do that?

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ADMIN EDIT

For the time being, the way to affect the filter behavior is through a custom filter template. The format for date pickers and numeric textboxes comes from the app culture settings (see more here). You may also want to Follow this idea for easier selection of a default filter operator and limiting the filter operators choices.

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I'm trying manual source operations with grouping and aggregates, but I get: InvalidOperationException: No generic method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic

I've edited the sample in the docs of manual source operations with grouping and added some aggregates.

Since some feats with the grid are not compatible with others, it is not easy to understand what is feasible and what is not. I know from the docs that virtual scolling is not compatible with many feats, or that group load on demand is not comaptible with aggregates, but I don't found any about aggregates with manual operations.

Please find the attached demo project

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ADMIN EDIT

At the end of this post you can find the two most common scenarios that can exhibit this problem, and a video that illustrates it.

A potential workaround could be to avoid the second call to onread because that's where the problem lies, with code similar to this:

    int readCounts { get; set; }
    protected async Task ReadItems(GridReadEventArgs args)
    {
        if (readCounts != 1) // the second call is skipped - that's where the problem lies
        {
            Console.WriteLine("ONREAD with skip " + args.Request.Skip);
            HttpResponseMessage response = await Http.PostAsJsonAsync("WeatherForecast", args.Request);

            if (response.StatusCode == System.Net.HttpStatusCode.OK)
            {
                DataEnvelope<WeatherForecast> envelope = await response.Content.ReadFromJsonAsync<DataEnvelope<WeatherForecast>>();

                GridData = envelope.CurrentPageData;
                Total = envelope.TotalItemCount;

                StateHasChanged();
            }
        }
        readCounts++;
    }

where you may need to extend this a little to also use a flag for whether there was state loaded at all - if there wasn't, then the OnRead call may want to continue because it could be a legitimate user action. Whether this is needed is up to the app and whether your users already have a state saved (if you use OnStateChanged to save the state, they probably already do).

Another possible workaround is to always save Skip=0 in the state so that the user always starts at the top of the grid rather than juuust slightly off from where they expect.

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ADMIN EDIT

Attached to this post are a reproducible and a workaround - setting the state in OnAfterRenderAsync with a small delay, so the initial grid render happens, then it can re-render and take the filters into account.

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I'm getting error for dynamic Grid InCell editing. Error is displayed on editing before calling UpdateHandler. It is observed for adding new row or editing any row. 

Error: System.ArgumentException: Instance property 'x' is not defined for type 'System.Dynamic.ExpandoObject' (Parameter 'propertyName')

I was not getting this error In previous version 2.21.0 on edit of a dynamic field. Getting this error after updating to new 2.23.0 version without any code change.

I noticed after debugging a problem when editing some rather complex rows in a grid that the grid internally calls Telerik.Blazor.Extensions.ObjectExtensions.Clone(...) to create a deep clone for editing. If the object being cloned implements System.ICloneable then this is ignored and an attempt is made to clone it using reflection - the problem is that ObjectExtensions.Clone(...) fails for a number of cases and observing ICloneable would give a developer the means to implement the correct cloning behaviour.

I'm not asking for ObjectExtensions.Clone(...) to be fixed in any way (after all, no matter what you do there will always be some cases it cannot handle), just to use ICloneable where possible.

As an aside, the failed cases were:

• object has an indexer with get/set (exception thrown by ObjectExtensions.Clone() because it attempts to read the value without passing an index)
• object implements IEnumerable, including arrays (original object returned without being cloned)
• object contains a circular reference (stack overflow)

The grid should support INotifyPropertyChanged for the objects in the grid, i.e. if the data object implements INotifyPropertyChanged and a property value changes, the corresponding cell value in the grid should also change.

I want the grid to be able to resize all the columns (or only certain columns) to fit their data, when the data loads, without the user having to double click the border between them.

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ADMIN EDIT

Automatic application of the auto fitting will come with a flicker, and that's why it was declined as a feature originally. In Blazor we have a detachment between code and when exactly something is rendered. So, we have no way to trigger the resizing logic immediately after the columns content is rendered. The events that are available will cause a flicker and can cause a performance hit - both for the browser and also by raising StateChanged multiple times.

Another caveat is how would this be exposed for configuration - should it work for all columns at once, or only for certain columns (how to control for which ones), how to control which data-related events should invoke this logic (or should it happen super often on any event). Exposing such configuration is likely to lead to a property hell type of situation.

Perhaps a way to get this would be to provide API on the grid to invoke that functionality that you can call as required by your logic and UX: https://feedback.telerik.com/blazor/1513384-programmatically-invoke-fit-to-width-functionality-for-the-grid-columns.

Nevertheless, we will keep this open to monitor for feedback, what is requested, interest and how people would want it exposed. Leave your comments and preferences here.

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I have a WASM application and I setup my Grid to use the editor as an editing field in the Grid. When the user types something the application is laggy and it might even hang.

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ADMIN EDIT

Attached is a sample app that alleviates this a little by using a regular textarea and making editor updates less frequent.

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I want to be able to use interfaces and models that are created from a service when working with the grid. A parameterless constructor is not enough for me, I need to be able to instantiate models in a more complex manner.

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ADMIN EDIT

The tentative event name I have put in the title might vary when the implementation is researched. The goal would still be the same - the grid to provide an event when it needs an instance of the model so you can provide it with one. At the moment this happens when a row enters edit mode, when the filter list needs to be built, and when you are inserting an item (a caveat with the last one might be the OnClick event for the command button - the new event might have to fire before OnClick so it can give you the model).

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