Blazor bootstrap 5 modal:如何不将属性绑定到值？

<button @onclick="ShowModal">打开Modal</button>
<div class="modal" tabindex="-1" role="dialog" style="@modalStyle" @ref="modalRef">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Modal标题</h5>
                <button type="button" class="close" @onclick="HideModal">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                Modal内容
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-primary" @onclick="HideModal">确认</button>
                <button type="button" class="btn btn-secondary" @onclick="HideModal">取消</button>
            </div>
        </div>
    </div>
</div>

@code {
    private bool showModal = false;
    private string modalStyle = "";

    private ElementReference modalRef;

    private void ShowModal()
    {
        showModal = true;
        modalStyle = "display: block;";
    }

    private void HideModal()
    {
        showModal = false;
        modalStyle = "";
    }
}

<button @onclick="ShowModal">打开Modal</button>

@code {
    private void ShowModal()
    {
        JSRuntime.InvokeVoidAsync("showModal");
    }
}

function showModal() {
    // 通过JavaScript代码来显示modal
    // ...
}