c# - “HttpClient”不包含 'GetFromJsonAsync' 的定义

Question

我新建了一个 西装外套 应用程序，我想通过 访问 URL HttpClient
我遇到了这个错误

'HttpClient' does not contain a definition for 'GetFromJsonAsync' and no accessible extension method 'GetFromJsonAsync' accepting a first argument of type 'HttpClient' could be found (are you missing a using directive or an assembly reference?) [BlazorApp]csharp(CS1061) ,

这是我的代码

 @inject HttpClient Http
    <h1>@name</h1>
    @code {
        private string name;
    
        protected override async Task OnInitializedAsync()
        {
            name = await Http.GetFromJsonAsync<string>("api/");
        }
    }

Answer 1

您需要添加以下 using 指令:

using System.Net.Http.Json;

GetFromJsonAsync is an extension method ，不属于 HttpClient本身。