Question

我使用WebClient类来寻找网站。它返回一个下载对话框，用于在json文件中下载输出。 Issit可以在不下载的情况下读取json文件中的内容吗？我打开了chrome并粘贴了相同的url，chrome在浏览器中显示了输出。

Answer 1

这取决于内容类型和浏览器，在某些情况下，内容可能是压缩。 Stackoverflow API就是这样一个例子。

在这些情况下，您需要设置request.AutomaticDecompression。下面的代码可能会让您对理解有所了解并从那里继续。

public string CallRequest(Uri url)
{
    var request = WebRequest.Create(url) as HttpWebRequest;
    var httpResponse = "";
    if (request != null)
    {
        request.UserAgent = "stackoverflow"; // just example.
        request.Accept = "gzip,deflate";
        request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

        using (var response = request.GetResponse() as HttpWebResponse)
        {           
            using (var responseStream = response.GetResponseStream())
            {
                var reader = new StreamReader(responseStream);
                httpResponse = reader.ReadToEnd();
            }
        }
    }

    return httpResponse;
}

Answer 2

只需向链接发出请求即可获得字符串中的JSON：

public static Response MakeRequest(string requestUrl){
try
{
    HttpWebRequest request = WebRequest.Create(requestUrl) as HttpWebRequest;
    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    {
        if (response.StatusCode != HttpStatusCode.OK)
            throw new Exception(String.Format(
            "Server error (HTTP {0}: {1}).",
            response.StatusCode,
            response.StatusDescription));
        DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(Response));
        object objResponse = jsonSerializer.ReadObject(response.GetResponseStream());
        Response jsonResponse
        = objResponse as Response;
        return jsonResponse;
    }
}
catch (Exception e)
{
    Console.WriteLine(e.Message);
    return null;
}

}

如何从http处理json

2 个答案: