在 C# 中使用 JsonValue 访问 json 键

Question

我使用 Google API 到 return 一个地方，然后我使用 JsonValue 访问它。当我想访问结果时，一切正常，当我“更深入”时，我得到超时异常。如何访问其他对象并遍历 JSON 对象？

回复：

{
   "html_attributions" : [],
   "results" : [
      {
         "geometry" : {
            "location" : {
               "lat" : -33.867551,
               "lng" : 151.200817
            }
         },
         "icon" : "https://maps.gstatic.com/mapfiles/place_api/icons/generic_business-71.png",
         "id" : "b0277cade7696e575824681aba949d68814f9efe",
         "name" : "Sydney New Year's Eve Cruises",
         "opening_hours" : {
            "open_now" : false,
            "weekday_text" : []
         },
         "photos" : [
            {
               "height" : 813,
               "html_attributions" : [
                  "\u003ca href=\"https://maps.google.com/maps/contrib/107666140764925298472/photos\"\u003eSydney New Year&#39;s Eve Cruises\u003c/a\u003e"
               ],
               "photo_reference" : "CoQBcwAAAF5NycTw0r7cw8CHxZCKNvFGUSFndKXuPT4j5lXZXI_T-1SkRfdGwhayhQdRD0-4omka8cFZc02E8grQ7t8LduyznGgIBCocN24QLznNY2q9x3FmW-d-Ry74CNo3WX0YQKXg2JqIbXRH86X-X_TXGNrc75_fQwd-x8CE2-MeaVn3EhD1hfBnjPtXGv9QS234kiOIGhStf_EjMEL53bwDKocQ5cw3iYhCUA",
               "width" : 1300
            }
         ],
         "place_id" : "ChIJ__8_hziuEmsR27ucFXECfOg",
         "reference" : "CoQBcQAAAEW7axO9F7XCp3AMXS6VjAOYY4g-pzVSmvZmC3kARg7wHywP_jI4tbNSD01q0hzdqxfe9fHxruuNeaaM-5VWKiNumQuFBKYAitfKlUGB8BxQlnJ3jef_7hVgquryh4Vm2Qo9EOl9-BLlpdHt0tdMDQhZHK3XKVMf024gWYP3F1sxEhBVaaVAe3r51tlCIsn_-z48GhQiawR_3Sh9KQOJ2wNqjoh42FazBA",
         "scope" : "GOOGLE",
         "types" : [
            "travel_agency",
            "restaurant",
            "food",
            "point_of_interest",
            "establishment"
         ],
         "vicinity" : "32 The Promenade, King Street Wharf 5, Sydney Nsw 2000, Sydney"
      }
   ],
   "status" : "OK"
}

C#:

JsonValue json = await FetchDataAsync (url);
JsonValue resultsJson = json["results"];

我能够在 resultsJson 中看到响应，但是当我尝试在 resultsJson 之后使用以下方法直接访问几何时：

JsonValue geometryJson = resultsJson["geometry"];

我收到超时异常。我做错了什么？

Answer 1

因为 results 是一个数组，你应该尝试这样的事情：

json["results"][0]["geometry"]

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