radzen-blazor/Radzen.Blazor/Spreadsheet/Tools/ConditionalFormat.razor

@using Radzen.Blazor.Spreadsheet
@using Radzen.Documents.Spreadsheet
@inject DialogService DialogService

<RadzenSplitButton Click=@OnClickAsync Icon="format_color_fill" Text="Conditional" Disabled=@IsDisabled ButtonStyle="ButtonStyle.Base" Size="ButtonSize.Small">
    <ChildContent>
        <RadzenSplitButtonItem Text="Greater Than..." Value="greater" />
        <RadzenSplitButtonItem Text="Less Than..." Value="less" />
        <RadzenSplitButtonItem Text="Between..." Value="between" />
        <RadzenSplitButtonItem Text="Equal To..." Value="equal" />
        <RadzenSplitButtonItem Text="Text Contains..." Value="text" />
    </ChildContent>
</RadzenSplitButton>

@code {
#nullable enable

    [Parameter]
    public Sheet? Sheet { get; set; }

    private bool IsDisabled => Sheet?.Selection.Cell == CellRef.Invalid;

    private async Task OnClickAsync(RadzenSplitButtonItem? item)
    {
        if (Sheet == null || Sheet.Selection.Cell == CellRef.Invalid)
        {
            return;
        }

        var ruleType = item?.Value ?? "greater";

        var result = await DialogService.OpenAsync<ConditionalFormatDialog>("Conditional Formatting",
            new Dictionary<string, object?>
            {
                { "RuleType", ruleType }
            });

        if (result is ConditionalFormatBase rule)
        {
            var command = new ConditionalFormatCommand(Sheet, Sheet.Selection.Range, rule);
            Sheet.Commands.Execute(command);
        }
    }
}