c# - 这种方法有没有我没有看到的陷阱

Question

服务注册

  services.AddScoped(typeof(PageStorageService<>), typeof(PageStorageService<>));

服务声明

 public interface IStoredPage<T>
    {   
        T PageState { get; set; }
    }
    public class PageStorageService<T> : IStoredPage<T>
    {
        public T PageState { get; set; }
    }

CounterPage 中的用法

@page "/counter"

@using BlazorApp1.Data
 
<h1>Counter</h1>

<p>Current count: @currentCount</p>

@inject PageStorageService<Counter> StorageService

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

@code {

    private int currentCount = 0;

    private void IncrementCount()
    {
        currentCount++;
    }

    protected override async Task OnParametersSetAsync()
    {
        // reset what we want from stored copy
        if (StorageService.PageState != null)
        {
            currentCount = StorageService.PageState.currentCount;

        }
        //reconnect for this page lifespan we have a reference copy of the pages class
        // which is copied into the service  Or so experimentation seems to indicate
        StorageService.PageState = this;
    }

我已经运行了多个小测试，例如上面的测试）

以及使用 OnInitialziedAsync 的改进（在未显示的计数器类中添加了一个附加列表）

@using BlazorApp1.Data
 
<h1>Counter2</h1>

<p>Current count: @currentCount</p>
<p>PageStateNull : @PageStateNullCount</p>

<div>  @((MarkupString)string.Join("\r\n", TestDataSave))  </div>

    @inject PageStorageService<Counter2> StorageService

    <button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

    @code {

        private int PageStateNullCount = 0;

        private List<string> TestDataSave;

        private int currentCount = 0;

        private void IncrementCount()
        {
            TestDataSave.Add("<div>count before Inc : " + currentCount.ToString() + "</div>");
            currentCount++;
            TestDataSave.Add("<div>count after Inc :" + currentCount.ToString() + "<div>");

        }

        protected override Task OnInitializedAsync()
        {
            // reset what we want from stored copy
            if (StorageService.PageState != null)
            {
                currentCount = StorageService.PageState.currentCount;
                TestDataSave = StorageService.PageState.TestDataSave;
                PageStateNullCount = StorageService.PageState.PageStateNullCount;
            }
            else
            {
                PageStateNullCount++;
                //create for the first time aka read from database
                TestDataSave = new List<string>();
                TestDataSave.Add("<div>OnParametersSetAsync</div>");
            }


            //reconnect 
            StorageService.PageState = this;

            return base.OnInitializedAsync();
        }

这对我来说似乎很干净而且很直接。但是更多的眼睛通常更好。它遵循与我见过的本地存储解决方案相同的一般模式（在我的情况下，我只想存储仪表板类型应用程序的过滤器和选项卡选择——我不会有大型表单等，我对与偶尔的服务器崩溃相比，在内存中拥有页面状态的优势。它作为服务注入的事实意味着我想使用的任何页面都可以选择加入..等想法，岩石，我应该想到的事情？

标签： c#genericsdependency-injectionblazor