HttpClient來自官方的JSON擴展方法
- 2020 年 4 月 13 日
- 筆記
System.Net.Http.Json
Json的序列化和反序列化是我們日常常見的操作，通過System.Net.Http.Json我們可以用少量的程式碼實現上述操作.正如在github設計文檔中所描述
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.
他的依賴項也非常的少目前只依賴System.Net.Http, System.Text.Json
System.Text.Json相對於Newtonsoftjson平均快了兩倍，如果有興趣相關基準測試可在這個文章中查閱
//devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/
在.NET中安裝和使用
目前它還是預覽版本
dotnet add package System.Net.Http.Json
public static async Task<Customer> GetCustomerAsync()
{
HttpClient clinet=new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Get, "//localhost:5000/customers");
var response = await clinet.SendAsync(request);
return await response.Content.ReadFromJsonAsync<Customer>();
}
通過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, "//localhost:5000/create");
request.Content = JsonContent.Create(customer);
var response = await clinet.SendAsync(request);
var content=response.Content.ReadAsStringAsync();
return customer;
}
還可以以下面這種簡潔方式使用
_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.");
}
}
還可以通過NotSupportedException和JsonException異常類處理相應的異常.
Reference
//github.com/hueifeng/BlogSample/tree/master/src/SYSTEMNETHTTPJSON
//www.stevejgordon.co.uk/sending-and-receiving-json-using-httpclient-with-system-net-http-json
