Question

我已按照示例here和here使用C＃HttpClient成功处理超时但我无法使其正常工作！

var urls = new List<string> { "/success", "/willtimeout", "/success" };
var baseAddress = "http://endpoint";
var httpClient = new HttpClient();
httpClient.Timeout = new TimeSpan(0, 0, 30);
httpClient.BaseAddress = new Uri(baseAddress);
foreach (var url in urls)
{
    try
    {
        var cs = CancellationTokenSource.CreateLinkedTokenSource(CancellationToken.None);
        cs.CancelAfter(new TimeSpan(0, 0, 3));
        var result = await httpClient.GetAsync(urls, cs.Token);
        Console.WriteLine("Success");
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

此代码将打印

Success
A task was canceled.
A task was canceled.

如果不每次都创建新的HttpClient，我怎样才能正常工作？

Answer 1

CreateLinkedTokenSource创建一个CancellationTokenSource，当任何源令牌处于取消状态时，该源将处于取消状态。

所以我猜这就是问题所在，每次只创建新的令牌源，不要将它链接到任何东西：

try
{
    var cs = new CancellationTokenSource();
    // ...

C＃HttpClient服务器超时取消所有后续请求

1 个答案: