blazor - 非泛型方法 'HttpClient.GetAsync(string)' 不能与类型参数一起使用

Question

我有这个注册 HttpClient 的代码

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddRazorPages();
        services.AddServerSideBlazor();

        services.AddHttpClient("ServerAPI", client =>
            client.BaseAddress = new Uri("http://localhost:xxxxx/"));
    }

为了使用它，我将它注入(inject)了我的 Blazor Razor 页面，

@page "/Movies/FetchMovies"
@inject IHttpClientFactory http;
@using System.Text.Json

<MovieList Movies="movies" />

@code{
    private List<Movie> movies;

    protected override async Task OnInitializedAsync()
    {
        var client = http.CreateClient("ServerAPI");        
        movies = await client.GetAsync<List<Movie>>("api/Movies");

        //movies = await client.GetFromJsonAsync<List<Movie>>("api/Movies");
    }
}

问题是这条线 movies = await client.GetAsync<List<Movie>>("api/Movies");得到一个错误: The non-generic method 'HttpClient.GetAsync(string)' cannot be used with type arguments

我试过 movies = await client.GetFromJsonAsync<List<Movie>>("api/Movies")但也会出错。

Answer 1

如果您希望改用 GetFromJsonAsync 方法，请执行以下操作:

1. 安装包System.Net.Http.Json
2. 引用命名空间:System.Text.Json 和 System.Net.Http.Json

要么到您的特定 razor 文件，要么到/_Imports.razor 文件。

现在这段代码将完成工作...

movies = await client.GetFromJsonAsync<List<Movie>>("api/Movies");