1 public class TestService
 2 {
 3     private readonly IHttpClientFactory _httpClientFactory;
 4 
 5     public TestService(IHttpClientFactory httpClientFactory)
 6     {
 7         _httpClientFactory = httpClientFactory;
 8     }
 9 
10     // 同步方式 - 會卡住UI
11     public object GetData()
12     {
13         using var httpClient = _httpClientFactory.CreateClient();
14         var data = httpClient.GetByteArrayAsync("https://example.com");
15         // 在獲取完成前什么都做不了
16         return data;
17     }
18 
19     // 異步方式 - 不會卡住UI
20     public async Task<object> GetDataAsync()
21     {
22         using var httpClient = _httpClientFactory.CreateClient();
23         var data = await httpClient.GetByteArrayAsync("https://example.com");
24         // 在獲取過程中程序可以干別的
25         return data;
26     }
27 }