Question

我目前正在编写代码，但是我收到错误＆＃34;无法访问Newtonsoft.Json.Linq.JValue上的子值＆＃34;当我试图从我的json获得一个关于心室＆＃34;行＆＃34;。

的值

我将数据作为JObject并通过httplink收集，因此我可以很好地获取数据。但是我很难收集我选择的所选行之一。这是代码：

async void loadPhot ()
    {
        var getItems = await parse.getPhotos ();

        foreach (var moreitems in getItems["results"])
        {
            var Pic = "";

            Pic = (string)moreitems["Image"][0]; //error here. trying to get the first data in the json

            picture.Source = Pic; //picture is my x:name of my image in xaml.

        }

    }

json看起来像这样：

{

"results": [
    {

        "Image": "url"
    },

    {

        "Image": "url2"
    }
          ]

 }

Answer 1

只需替换

Pic = (string)moreitems["Image"][0]; //error here. trying to get the first data in the json

带

Pic = (string)moreitems["Image"]; //error here. trying to get the first data in the json

要获取特定行的项目，请执行以下操作：

var rows = getItems["results"]; 

int desiredRow = 0;

var itemAtRow = rows.ElementAt(desiredRow);

var imageAtRow = itemAtRow["Image"];

Answer 2

如果您总是想要第一个值，那么请不要使用循环

    var getItems = await parse.getPhotos ();

    // get the value of the first item in the results
    var Pic = (string)getItems[0];

    picture.Source = Pic; //picture is my x:name of my image in xaml.

如何从一个特定的＆＃34;行＆＃34;中获取值。在我的json中进入我的xamarincode？

2 个答案: