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<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