System.Net.Http.Json Json的序列化和反序列化是我们日常常见的操作，通过System.Net.Http.Json我们可以用少量的代码实现上述操作.正如在github设计文档中所描述 Serializing and deserializing JSON payloads from the network is a very common operation for clients, especially in the upcoming Blazor environment. Right now, sending a JSON payload to the server requires multiple lines of code, which will be a major speed bump for those customers. We'd like to add extension methods on top of HttpClient that allows doing those operations with a single method call. 他的依赖项也非常的少目前只依赖System.Net.Http, System.Text.Json System.Text.Json相对于Newtonsoftjson平均快了两倍，如果有兴趣相关基准测试可在这个文章中查阅 https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/ 在.NET中安装和使用 目前它还是预览版本 dotnet add package System.Net.Http.Json public static async Task GetCustomerAsync() { HttpClient clinet=new HttpClient(); var request = new HttpRequestMessage(HttpMethod.Get, "http://localhost:5000/customers"); var response = await clinet.SendAsync(request); return await response.Content.ReadFromJsonAsync(); } 通过ReadFromJsonAsync直接可以反序列化 public static async Task CreateCustomerAsync() { HttpClient clinet = new HttpClient(); var customer=new Customer() { Id = "1", Name = "Fh" }; var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost:5000/create"); request.Content = JsonContent.Create(customer); var response = await clinet.SendAsync(request); var content=response.Content.ReadAsStringAsync(); return customer; } 还可以以下面这种简洁方式使用 _client.GetFromJsonAsync>("/customers"); _client.GetFromJsonAsync($"/customers/{id}"); _client.PutAsJsonAsync($"/customers/{customerId}", customer); if (response.IsSuccessStatusCode) { try { return await response.Content.ReadFromJsonAsync(); } catch (NotSupportedException) // When content type is not valid { Console.WriteLine("The content type is not supported."); } catch (JsonException) // Invalid JSON { Console.WriteLine("Invalid JSON."); } } 还可以通过NotSupportedException和JsonException异常类处理相应的异常. Reference https://github.com/hueifeng/BlogSample/tree/master/src/SYSTEMNETHTTPJSON https://www.stevejgordon.co.uk/sending-and-receiving-json-using-httpclient-with-system-net-http-json https://github.com/dotnet/designs/blob/d4018c99c8134e9114a869e2e73a050059b9e663/accepted/2020/json-http-extensions/json-http-extentions.md