Subclass PropertyColumn for QuickGrid display name support

[guardrex]

Description

Add a section on this until the PU addresses it on dotnet/aspnetcore#49147.

The code will be something like (either of the following from devs in discussion on the PU issues will work) ...

public class DisplayNamePropertyColumn<TGridItem, TProp> : PropertyColumn<TGridItem, TProp>
{
    protected override void OnParametersSet()
    {
        if (Title is null && Property.Body is MemberExpression memberExpression)
        {
            var memberInfo = memberExpression.Member;
            var displayName = memberInfo?.GetCustomAttribute(typeof(DisplayNameAttribute)) as DisplayNameAttribute;
            var display = memberInfo?.GetCustomAttribute(typeof(DisplayAttribute)) as DisplayAttribute;
            Title = displayName?.DisplayName ?? display?.Name ?? memberInfo?.Name ?? "";
        }

        base.OnParametersSet();
    }
}

... or ...

public class DisplayNamePropertyColumn<TGridItem, TProp> : PropertyColumn<TGridItem, TProp>
{
    protected override void OnParametersSet()
    {
        if (Title is null && Property.Body is MemberExpression memberExpression)
        {
            var memberInfo = memberExpression.Member;
            Title = memberInfo?.GetCustomAttributes<DisplayNameAttribute>(false).FirstOrDefault()?.DisplayName ??
                    memberInfo?.GetCustomAttributes<DisplayAttribute>(false).FirstOrDefault()?.Name ??
                    memberInfo?.GetCustomAttributes<DisplayNameAttribute>(true).FirstOrDefault()?.DisplayName ??
                    memberInfo?.GetCustomAttributes<DisplayAttribute>(true).FirstOrDefault()?.Name ??
                    memberInfo?.Name;
        }

        base.OnParametersSet();
    }
}

... with the model DA as ...

[Display(Name = "Release Date")]
public DateTime ReleaseDate { get; set; }

... and the subclassed column in the QG ...

<DisplayNamePropertyColumn Property="movie => movie.ReleaseDate" />

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/components/quickgrid?view=aspnetcore-8.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/components/quickgrid.md

Document ID

564e71e3-82ed-ce23-4f9f-a00a58734a62

Article author

@guardrex

[guardrex]

We'll be going with ... 🥁🥁🥁 PLZ ...

if (Title is null && Property.Body is MemberExpression memberExpression)
{
    var memberInfo = memberExpression.Member;
    Title =
        memberInfo.GetCustomAttribute<DisplayNameAttribute>().DisplayName ??
        memberInfo.GetCustomAttribute<DisplayAttribute>().Name ??
        memberInfo.Name;
}

base.OnParametersSet();