c异步http请求

本文关键字：请求 http 异步 | 更新日期: 2023-09-27 18:25:10

我正在尝试对某个服务器进行异步调用，这样主线程就不会因请求而停止。

我创建了这样的请求：

//Create Request
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
        request.Method = method;
        request.ContentType = "application/XML";
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
        byte[] bytes = encoding.GetBytes(data);
        request.ContentLength = bytes.Length;
        try
        {
            using (Stream requestStream = request.GetRequestStream())
            {
                // Send the data.
                requestStream.Write(bytes, 0, bytes.Length);
            }
            request.BeginGetResponse((x) =>
            {
                using (HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(x))
                {
                    if (callback != null)
                    {
                        callback(response.GetResponseStream());
                    }
                }
            }, null);
        }
        catch (Exception ex)
        {
            //TODO: Log error
        }

但是线程在这个请求中仍然会停止一段时间。特别是在使用的线路上

(Stream requestStream = request.GetRequestStream())

有没有什么方法可以让它完全异步，或者其他更好的方法，这样我们的主线程就不会为这个请求挂起。

c异步http请求

using (HttpClient client = new HttpClient())
{
    var content = new StringContent(data, Encoding.UTF8, "application/xml");
    var response = await client.PostAsync(uri, content);
    var respString = await response.Content.ReadAsStringAsync();
}

需要使用异步方法并等待它们。

using (var stream = await request.GetRequestStreamAsync())
{
    await stream.WriteAsync(bytes, 0, bytes.Length);
}

这里有一个简单的示例，我正在使用它来发出异步请求。用async keyword 标记您的方法

using (var httpClient = new HttpClient())
{
    string requestContent = string.Empty; // JSON Content comes here
    HttpContent httpContent = new StringContent(requestContent, Encoding.UTF8, "application/json");
    HttpRequestMessage httpRequestMessage = new HttpRequestMessage(Verb, url);
    httpRequestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    httpRequestMessage.Content = request.Verb == HttpMethod.Get ? null : httpContent;
    response = httpClient.SendAsync(httpRequestMessage);
    var responseContent = await response.Result.Content.ReadAsStringAsync();

}

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