在 Blazor 动态组件中，要使参数更新，需要在组件的生命周期中手动调用 StateHasChanged 方法。具体来说，在参数发生变化时，应该在 OnParametersSetAsync 方法中调用 StateHasChanged 方法。

示例代码：

@using Microsoft.AspNetCore.Components


@code {
    [Parameter] public Type componentType { get; set; }
    private RenderFragment componentBody;

    protected override async Task OnParametersSetAsync()
    {
        await base.OnParametersSetAsync();

        // update the component body based on the new parameters
        componentBody = builder =>
        {
            builder.OpenComponent(0, componentType);
            builder.AddAttribute(1, "Param1", "new value");
            builder.CloseComponent();
        }

        // call StateHasChanged to ensure the update is reflected in the UI
        StateHasChanged();
    }
}