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c# - 在 .NET Core 2 中创建 HttpClient 的最佳实践

转载 作者：行者123 更新时间：2023-11-30 21:30:57 24 4
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<分区>

让 HttpClientWrapper 在 .net core 2 中创建 HttpClients 是一个好习惯吗？

HttpClient 将被创建和缓存，然后从缓存中检索

    public class HttpClientWrapper : IHttpClientWrapper
    {
    private IMemoryCache cache;
    public HttpClientWrapper(IMemoryCache _cache)
    {
        cache = _cache;
    }

    public HttpClient CreateClient(string baseUrl)
    {
        HttpClient httpClient;
        if (!cache.TryGetValue(baseUrl, out httpClient))
        {

             MemoryCacheEntryOptions cacheExpirationOptions = new MemoryCacheEntryOptions();
             //cacheExpirationOptions.AbsoluteExpiration = DateTime.Now.AddMinutes(30);
             cacheExpirationOptions.SlidingExpiration = new TimeSpan(0, 30, 0);
             cacheExpirationOptions.Priority = CacheItemPriority.Normal;


            httpClient = new HttpClient();
            httpClient.BaseAddress = new Uri(baseUrl);
            cache.Set<HttpClient>(baseUrl, httpClient, cacheExpirationOptions);
        }
        return httpClient;
    }
}

及其用法

[Route("api/[controller]")]
[ApiController]
public class CustomValuesController : ControllerBase
{
    private readonly HttpClient httpClient;
    private readonly HttpClient httpClient1;

    public CustomValuesController(Common.IHttpClientWrapper _httpClientWrapper)
    {
        httpClient = _httpClientWrapper.CreateClient("http://localhost:9000");
        httpClient1 = _httpClientWrapper.CreateClient("http://localhost:9001");
    }
}

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