“System.Net.Http.HttpContent”不包含“ReadAsAsync”的定义

WebApi当道的今天，之前要自己写的序列化，现在有人都做好了

    public class PostHelper
    {
        static HttpClient client = new HttpClient();
        public static async Task<T> PostTestAsync<T>(string url,T args)
        {   
            //string json = JsonSerializer.Serialize(args);
            //HttpContent content = new StringContent(json,Encoding.UTF8);
            //content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue ("application/json");
            //HttpResponseMessage response = await client.PostAsync(url, content);

            HttpResponseMessage response = await client.PostAsJsonAsync(url, args);
            response.EnsureSuccessStatusCode();
            // Deserialize the updated product from the response body.
            var result = await response.Content.ReadAsAsync<T>();
            return result;
        }
    }

对于倒数第二行，可以会有以下错误提示

“System.Net.Http.HttpContent”不包含“ReadAsAsync”的定义

对于Net4.X，可以添加以下引用

System.Net.Http.Formatting

对于net6.0，添加以下包

Microsoft.AspNet.WebApi.Client

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