C#HttpClient无需等待响应即可发布信息

Question

我在我的asp.net web api 2应用程序中使用HttpClient类将一些信息发布到端点.我只是想在不等待回复的情况下发布信息.这是正确的语法

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("http://localhost:9000/");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    // HTTP POST
    var gizmo = new Product() { Name = "Gizmo", Price = 100, Category = "Widget" };
    var response = await client.PostAsJsonAsync("api/products", gizmo);
}

Answer 1

要在 ASP.NET 中实现异步任务，请参阅以下示例语法：

    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            RegisterAsyncTask(new PageAsyncTask(LoadUrlContent));
        }
        catch {}
    }

    protected async Task LoadUrlContent()
    {
        try
        {
        // Add your code here, for example read the content using HttpClient:
        string _content = await ReadTextAsync(YourUrl, 10);
        }
        catch { throw; }
    }

另外， <%@ Page ... Async="true" %>在页面级别设置。

以下示例代码片段显示了 HttpClient 的使用（从以下位置调用此示例函数LoadUrlContent()：

protected async Task<string> ReadTextAsync(string Url, int TimeOutSec)
{
    try
    {
        using (HttpClient _client = new HttpClient() { Timeout = TimeSpan.FromSeconds(TimeOutSec) })
        {
            _client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("text/html"));
            using (HttpResponseMessage _responseMsg = await _client.GetAsync(Url))
            {
                using (HttpContent content = _responseMsg.Content)
                {
                    return await content.ReadAsStringAsync();
                }
            }
        }
    }
    catch { throw; }
}

您可以修改与您的特定任务相关的代码库。

希望这会有所帮助。