Hi Jason,

We use only the DataFormatString - something like {0:dd MMM yyyy} for dates, for example. Here is what its documentation says about this:

To set the desired format string, use the DisplayFormat parameter of the column.

If the model field has the DataFormatString set through the DisplayFormat DataAnnotation attribute, the grid will honor that without an explicit setting in the markup of the column.

You can use the standard C# formatting options, because the grid uses a string.Format call: MSDN: Format types in .NET.

At the moment, to handle nulls in a different manner than an empty cell, you should use the cell template.

That said, I logged a feature request on your behalf for the grid to use the NullDisplayText setting too: https://feedback.telerik.com/blazor/1510440-use-the-displayformatattribute-nulldisplaytext-property.

Regards,
Marin Bratanov
Progress Telerik

Hello Jason,

To each distinct question:

overriding the display of an item but not the data - this is done through the cell template and/or through the CellRender event. If a simple format can solve this, the DisplayFormat parameter of the column can also do this. If this is not sufficient for your needs, how would you propose this gets exposed through the row render event?

Preventing selection of the row - There is an open feature request for that here: Ability to enable/disable checkbox in checkbox column to allow/prevent selection of the row. Please Follow this enhancement there. Whether it will become available through the RowRender event or in another fashion is something that can be answered only when it gets reviewed and implemented. The thread also offers a few ideas you can consider with the easiest being handling the SelectedItemsChanged event to prevent the selection of those special rows. I've already added your Vote on it on your behalf to raise its priority.

With that in mind, I am marking this as a duplicate to this request to keep the portal tidy.

Regards,
Marin Bratanov
Progress Telerik