Newtonsoft JSON DeserializeObject序列化对象的反序列化

Question

I have the following JSON string being returned that I am trying to deserialize, but I am having problems with it filling in the values for the properties on the object.

Here is the JSON string being returned back:

"{\"ClientData\":[{\"clientID\":9999999,\"userID\":123,\"authID\":\"8a20627be9ec4c608f4c609a24e74174\"}]}"

Now, I have my ClientData class specified via the following:

public class ClientData
{
    [JsonProperty("clientID")]
    public long? ClientID { get; set; }

    [JsonProperty("userID")]
    public int? UserID { get; set; }

    [JsonProperty("authID")]
    public string AuthID { get; set; }
}

What am I doing wrong here in the conversion? I thought it would be as simple as specifying:

var result = JsonConvert.DeserializeObject<ClientData>(auth);

However, this doesn't yield any results. I think the problem may be how the JSON string is being constructed, ie the properties defined for the object.

Can someone help point me in the right direction?

Thanks

Answer 1

The data you have is a JSON array wrapped inside another object. You need to create a secondary class, place your ClientData as a list inside that one and deserialize that it.

Base class that contains your list

public class ClientDataInformation 
{
    [JsonProperty("ClientData")]
    public List<ClientData> ClientList {get;set;}
}

Deserialization

var result = JsonConvert.DeserializeObject<ClientDataInformation>(auth);

Answer 2

This might solve the problem

private static clientFileName = "yourfile.dat";

public static async Task<List<ClientData>> LoadClientDataFromJsonAsync()
    {
        string clientJsonString = await DeserializeClientDataAsync(clientFileName);
        if (clientJsonString != null)
            return (List<ClientData>)JsonConvert.DeserializeObject(clientJsonString, typeof(List<ClientData>));
        return null;
    }

private static async Task<ClientData> DeserializeClientDataAsync(string fileName)
    {
        try
        {
            StorageFile localFile = await ApplicationData.Current.LocalFolder.GetFileAsync(fileName);
            return await FileIO.ReadTextAsync(localFile);
        }
        catch (FileNotFoundException)
        {
            return null;
        }

Answer 3

Looks like your client data is set as an array. Remove the brackets and see if that works. Also, you have it wrapped in another class. If you need the prefaced ClientData, you'll need some kind of class like:

public class ClientDataObject
{
    public ClientData ClientData { get; set; }
}