c# - HttpClient.GetJsonAsync 未找到。 (blazor 服务器)

Question

我已经通过添加最新的包引用来安装该包。
来自 https://www.nuget.org/packages/Microsoft.AspNetCore.Blazor.HttpClient/
但我仍然无法找到所需的功能，例如 .. Client.GetJsonAsync
如果我遗漏了什么，你能帮我吗？
感谢 .

我在这里尝试但不能。

public async Task<User> GetUser(string Id)
        {
            HttpClient client = new HttpClient();
            var user = await client.GetJsonAsync($"{BaseUrl}Get-User/{Id}");
            return JsonConvert.DeserializeObject<User>(user);
        }

Answer 1

1.在blazor服务器应用中，当前HttpClient类不包含“GetJsonAsync”、“PostJsonAsync”和“PutJsonAsyc”方法。

2.你可以创建一个自定义的HttpClient类来添加这些缺失的方法来处理json数据

public CustomHttpClient : HttpClient 
{  
    public async Task<T> GetJsonAsync<T>(string requestUri)  
    {  
        HttpClient httpClient = new HttpClient();  
        var httpContent = await httpClient.GetAsync(requestUri);  
        string jsonContent = httpContent.Content.ReadAsStringAsync().Result;  
        T obj = JsonConvert.DeserializeObject<T>(jsonContent);  
        httpContent.Dispose();  
        httpClient.Dispose();  
        return obj;  
    }  

    public async Task<HttpResponseMessage> PostJsonAsync<T>(string requestUri, T content)  
    {  
        HttpClient httpClient = new HttpClient();  
        string myContent = JsonConvert.SerializeObject(content);  
        StringContent stringContent = new StringContent(myContent, Encoding.UTF8, "application/json");  
        var response = await httpClient.PostAsync(requestUri, stringContent);  
        httpClient.Dispose();  
        return response;  
    }  

    public async Task<HttpResponseMessage> PutJsonAsync<T>(string requestUri, T content)  
    {  
        HttpClient httpClient = new HttpClient();  
        string myContent = JsonConvert.SerializeObject(content);  
        StringContent stringContent = new StringContent(myContent, Encoding.UTF8, "application/json");  
        var response = await httpClient.PutAsync(requestUri, stringContent);  
        httpClient.Dispose();  
        return response;  
    }  
}

3.现在调用你的 Razor 页面:

@inject CustomHttpClient Http

@code{  

    protected override async Task OnInitializedAsync() {  
        await Http.GetJsonAsync < Emp[] > ("Your Url");  
    } 

    public class Emp
    { 
        public int? ID { get; set; }
        public string EmpName { get; set; }  
    }
}