[英]How to Request Specific Object From JSON URL with C# WebClient
Following code returns entire JSON objects but I need to Filter to some specific Object, for example I need to get only the "layers"
or tiltle
can you please let me know how to do this is C#? 下面的代码返回整个JSON对象,但是我需要过滤到某些特定的对象,例如,我只需要获取
"layers"
或“ tiltle
即可。请让我知道如何使用C#?
Do I have to create an HttpWebRequest
object for this? 我必须为此创建一个
HttpWebRequest
对象吗? if so where should I pass the requested data? 如果是这样,我应该在哪里传递请求的数据?
using (WebClient wc = new WebClient())
{
var json = wc.DownloadString("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Water_Network/FeatureServer?f=pjson");
Console.WriteLine(json);
}
I already tried this but it is also returning everything 我已经尝试过了,但它也返回了所有内容
class Program
{
private const string URL = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Water_Network/FeatureServer?f=pjson";
private const string DATA = @"{{""layers"":""Layers""}}";
static void Main(string[] args)
{
CreateObject();
}
private static void CreateObject()
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.Method = "POST";
request.ContentType = "application/json";
request.ContentLength = DATA.Length;
using (Stream webStream = request.GetRequestStream())
using (StreamWriter requestWriter = new StreamWriter(webStream, System.Text.Encoding.ASCII))
{
requestWriter.Write(DATA);
}
try
{
WebResponse webResponse = request.GetResponse();
using (Stream webStream = webResponse.GetResponseStream())
{
if (webStream != null)
{
using (StreamReader responseReader = new StreamReader(webStream))
{
string response = responseReader.ReadToEnd();
Console.WriteLine(response);
Console.ReadLine();
}
}
}
}
catch (Exception e)
{
Console.WriteLine("-----------------");
Console.WriteLine(e.Message);
Console.ReadLine();
}
}
}
If you need the info related to the layers
array object then you can use following code 如果您需要与
layers
数组对象相关的信息,则可以使用以下代码
using (var wc = new WebClient())
{
string json = wc.DownloadString("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Water_Network/FeatureServer?f=pjson");
dynamic data = Json.Decode(json);
Console.WriteLine(data.layers[0].id);
Console.WriteLine(data.layers[0].name);
Console.WriteLine(data.documentInfo.Title);
}
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