//AuthorizedGridColumn.razor
@typeparam TItem

@if (IsAuthorized)
{
    <GridColumn Field="@Field" Title="@Title">
        <Template Context="item">
            @ChildContent((TItem)item)
        </Template>
    </GridColumn>
}

@code {

    [Inject]
    private AuthenticationStateProvider AuthenticationStateProvider { get; set; } = null!;
    [Parameter] 
    publicstring Field { get; set; }
    
    [Parameter]
    publicstring Title { get; set; }
    
    [Parameter]
    public RenderFragment<TItem> ChildContent { get; set; }
    
    [Parameter]
    publicstring PolicyName { get; set; }
    
    privatebool IsAuthorized { get; set; }

    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
        var user = authState.User;

        if (user.Identity == null)
        {
            IsAuthorized = false;
        }
        else
        {
            IsAuthorized = user.Identity.IsAuthenticated && user.IsInRole("Admin");
        }
        await base.OnInitializedAsync();
    }
}
     

<AuthorizedGridColumn TItem="OurClass" Field="@nameof(OurClass.OurProperty)" Title="Something">
                            <ChildContent Context="binding">
                                @{
                                    <p>Only Admins!</p>
                                }
                            </ChildContent>
                        </AuthorizedGridColumn>

<AuthorizedGridColumn TItem="OurClass" Field="@nameof(OurClass.OurProperty)" Title="Something">
                            <ChildContent Context="binding">
                                @{
                                    <p>Only Admins!</p>
                                }
                            </ChildContent>
                        </AuthorizedGridColumn>
<GridColumn></GridColumn>
<GridColumn></GridColumn>

<AuthorizeView Roles="Admin">
                        <GridColumn></GridColumn>
                    </AuthorizeView> 
                    <GridColumn></GridColumn>
                    <GridColumn></GridColumn>