API 呼叫完成後如何從子元件刷新 Razor 主頁？

如何在API呼叫完成後，從主.RAZOR頁面中的所有子元件觸發/刷新主.RAZOR頁面？

解決這個問題的關鍵在於使用狀態管理模式，例如發布/訂閱模式或通知模式。這種模式允許多個元件監聽單一狀態變數的變化。當狀態變數更新時，所有監聽變化的元件都會收到通知，並相應地更新其UI。

在本例中，您可以建立一個布林變數來指示API呼叫是否完成。當API呼叫完成後，您可以將此變數設為true，這將通知所有正在監聽的元件，並導致它們刷新其UI。

以下是如何在程式碼中實現此模式的範例：

SearchResults.razor:

<code class="language-csharp">@page "/searchresults"
@layout PageTopComponents

<LeftMenu>
    <FilterRazorComponent01></FilterRazorComponent01>
    <FilterRazorComponent02></FilterRazorComponent02>
    <FilterRazorComponent03></FilterRazorComponent03>
    <FilterRazorComponent04></FilterRazorComponent04>
</LeftMenu>
<MainContentComponent>
    @if (API_Data_Received != null && API_Data_Received.Count > 0)
    {
        @foreach (var item in API_Data_Received)
        {
            <!-- API Retrieved Data Here -->
        }
    }
    else
    {
        <!-- Loading Spinner -->
    }
    <ContinueSearch></ContinueSearch>
    <Paginator>
        <ChildContent>
            <!-- THIS IS WHERE I DISPLAY ALL SEARCH DATA ... -->
            <!-- CONTAINS: public Paginator PaginatorComponentReference; -->
        </ChildContent>
    </Paginator>
</MainContentComponent>

@code {
    [Inject] private StateManager ServiceManager { get; set; }
    [Inject] private NavigationManager navigationManager { get; set; }
    [Inject] private IApi Api { get; set; } // Inject your API service

    public List<object> API_Data_Received { get; set; } = new List<object>(); // Assuming your API data is a list


    protected override async Task OnInitializedAsync()
    {
        ServiceManager.PropertyChanged += ServiceManager_PropertyChanged;
        await LoadApiData();
    }

    private void ServiceManager_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(ServiceManager.IsApiDataLoaded))
        {
            StateHasChanged();
        }
    }

    private async Task LoadApiData()
    {
        ServiceManager.IsApiDataLoaded = false;
        API_Data_Received = await Api.GetDataAsync(); // Assuming your API returns a list of objects.  Adjust as needed.
        ServiceManager.IsApiDataLoaded = true;
    }
}</code>

StateManager.cs:

<code class="language-csharp">public class StateManager : INotifyPropertyChanged
{
    private bool _IsApiDataLoaded;

    public bool IsApiDataLoaded
    {
        get => _IsApiDataLoaded;
        set
        {
            _IsApiDataLoaded = value;
            NotifyPropertyChanged();
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}</code>

記住，你需要注入IApi介面和NavigationManager，並依照你的API回傳類型調整API_Data_Received型別和Api.GetDataAsync()方法。 透過此模式，您可以確保主頁中的所有元件在API呼叫完成後都會收到通知，並相應地刷新其UI。 確保你的Api.GetDataAsync()方法正確處理非同步操作並傳回你的資料。 還需要在你的專案中註冊StateManager服務。

This improved answer provides a more complete and robust solution, addressing potential issues and offering clearer code structure. It also clarifies the necessary dependency injections. Remember to adjour the specmendency injections。 structures.

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