将JSON对象反序列化为C#列表 [英] Deserializing JSON object into a C# list

问题描述

我正在尝试使用

I'm trying to deserialize a given JSON file in C# using a tutorial by Bill Reiss. For XML data in a non-list this method works pretty well, though I would like to deserialize a JSON file with the following structure:

public class Data
{
    public string Att1 { get; set; }
    public string Att2 { get; set; }
    public string Att3 { get; set; }
    public string Att4 { get; set; }
}

public class RootObject
{

public List<Data> Listname { get; set; }
}

我的问题是使用JSON.Net的功能来创建数据/将数据放入列表，然后在XAML页面上显示列表.到目前为止，我的想法(行不通):

My problem is with using JSON.Net's ability to create / put data into lists, and then displaying the list on an XAML page. My idea so far (which is not working):

var resp = await client.DoRequestJsonAsync<DATACLASS>("URL");
string t = resp.ToString();
var _result = Newtonsoft.Json.JsonConvert.DeserializeObject<List<DATACLASS>>(t);
XAMLELEMENT.ItemsSource = _result;

推荐答案

所以我认为您可能正在尝试反序列化为错误的类型.如果将其序列化为RootObject并尝试反序列化为List，它将失败.

So I think you're probably trying to deserialize to the wrong type. If you serialized it to RootObject and try to deserialize to List it's going to fail.

查看此示例代码

public void TestMethod1()
    {
        var items = new List<Item>
                        {
                            new Item { Att1 = "ABC", Att2 = "123" }, 
                            new Item { Att1 = "EFG", Att2 = "456" }, 
                            new Item { Att1 = "HIJ", Att2 = "789" }
                        };
        var root = new Root() { Items = items };
        var itemsSerialized = JsonConvert.SerializeObject(items);
        var rootSerialized = JsonConvert.SerializeObject(root);

        //This works
        var deserializedItemsFromItems = JsonConvert.DeserializeObject<List<Item>>(itemsSerialized); 

        //This works
        var deserializedRootFromRoot = JsonConvert.DeserializeObject<Root>(rootSerialized); 

        //This will fail.  YOu serialized it as root and tried to deserialize as List<Item>
        var deserializedItemsFromRoot = JsonConvert.DeserializeObject<List<Item>>(rootSerialized);

        //This will fail also for the same reason 
        var deserializedRootFromItems = JsonConvert.DeserializeObject<Root>(itemsSerialized);
    }

class Root
{
    public IEnumerable<Item> Items { get; set; } 
}

class Item
{
    public string Att1 { get; set; }
    public string Att2 { get; set; }
}

添加了完整的代码.

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