可以在页面切换之间保留Blazor示例项目中的Counter状态吗? [英] Can the state of the Counter in the example Blazor project be preserved between page switches?

问题描述

在服务器端Blazor和WebAssembly Blazor项目的默认示例项目中，每次在页面之间移动时，Counter示例都会重置为0.但是，在ASP.NET React示例项目中，计数器不会在页面切换之间重置.

In the default example project for both server-side Blazor and WebAssembly Blazor projects, the Counter example resets to 0 every time you move between the pages. However, on the ASP.NET React example project, the Counter does not reset between page switches.

Counter之类的组件是否可以保留Blazor中页面导航之间的状态(至少对于不进行任何服务器调用的WebAssembly项目)?

Is there a way for a component like the Counter to preserve state between page navigation in Blazor (at least for the WebAssembly project that isn't making any server calls)?

推荐答案

在似乎Blazor并没有开箱即用，但您只需要使用localStorage或sessionStorage.

Seems Blazor just doesn't handle it out-of-the-box, but you just need to use localStorage or sessionStorage.

使用Blazor.Extensions.Storage NuGet软件包( https://github.com/BlazorExtensions/Storage ):

Using the Blazor.Extensions.Storage NuGet package (https://github.com/BlazorExtensions/Storage):

@page "/counter"

@inject ISessionStorage SessionStorage
@using Blazor.Extensions.Storage.Interfaces

<h1>Counter</h1>

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

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

@code {
    private int currentCount = 0;

    protected override async Task OnInitializedAsync()
    {
        currentCount = await SessionStorage.GetItem<int>("counter");
    }

    private async void IncrementCount()
    {
        currentCount++;
        await SessionStorage.SetItem<int>("counter", currentCount);
    }
}

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