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

Question

我有这个注册代码HttpClient

    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，我将它注入到我的 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");
    }
}

问题是这一行movies = await client.GetAsync<List<Movie>>("api/Movies");出现错误： The non-generic method 'HttpClient.GetAsync(string)' cannot be used with type arguments

我尝试过，movies = await client.GetFromJsonAsync<List<Movie>>("api/Movies")但也出现错误。

Answer 1

如果您想改用该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");