HttpClient来自官方的JSON扩展方法
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 verycommon operation for clients, especially in the upcoming Blazorenvironment. Right now, sending a JSON payload to the server requiresmultiple lines of code, which will be a major speed bump for thosecustomers. We'd like to add extension methods on top of HttpClient thatallows 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<Customer> 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<Customer>();}
通过ReadFromJsonAsync直接可以反序列化
public static async Task<Customer> 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<IReadOnlyList<Customer>>("/customers");_client.GetFromJsonAsync<Customer?>($"/customers/{id}");_client.PutAsJsonAsync($"/customers/{customerId}", customer);if (response.IsSuccessStatusCode){ try { return await response.Content.ReadFromJsonAsync<User>(); } 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
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