子组件Room：

@code { 

    [Parameter]
    public int filterOfficeId { get; set; } = 0;

    protected override Task OnParametersSetAsync()
    {
        this.pageIndex = 1;
        onSearch();

        return base.OnParametersSetAsync();

    }

父组件Office:

  <Button Size="small" @onclick="() => showRooms(context.Title,context.Id)">管理</Button>

<Modal Visible="roomPopup" Width="1200" MaskClosable="false" Title="@("【"+officeTitle+"】")" OnCancel="onClose" Footer="null">
    <Room filterOfficeId="@officeId"></Room>
</Modal>

@code { 
    private bool roomPopup { get; set; } = false;
    private int officeId { get; set; } = 0;

    void showRooms(string title, int id)
    {
        officeId = id; 
        roomPopup = true;
    }

}