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 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

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