JsonConvert.Deserialize not recognizing array

问题

I'm a little stumped on this one. Everything I do to check this out says it is a valid Json array, but JsonConvert.Deserialize says it is an object. Can someone point out what I'm doing wrong?

Code to replicate:

var data = "[{\"User\": {\"Identifier\": \"24233\",\"DisplayName\": \"Commerce Test Student\",\"EmailAddress\": \"email@email.ca\",\"OrgDefinedId\": \"UniqueId1\",\"ProfileBadgeUrl\": null,\"ProfileIdentifier\": \"zzz123\"},\"Role\": {\"Id\": 153,\"Code\": null,\"Name\": \"Commerce Student\"}}]";

var items = JsonConvert.DeserializeObject<List<T>>(data);

Where T is an object that matches the format below:

public class OrgUnitUser
{
    public User User { get; set; }
    public RoleInfo Role { get; set; }
}

public class User
{
    public string Identifier { get; set; }
    public string DisplayName { get; set; }
    public string EmailAddress { get; set; }
    public string OrgDefinedId { get; set; }
    public string ProfileBadgeUrl { get; set; }
    public string ProfileIdentifier { get; set; }
}
public class RoleInfo
{
    public int Id { get; set; }
    public string Code { get; set; }
    public string Name { get; set; }
}

It results in an error

Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[CoverPages.Models.D2L.OrgUnitUser]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

Any/all help is appreciated!

回答1:

var data = "[{\"User\": {\"Identifier\": \"24233\",\"DisplayName\": \"Commerce Test Student\",\"EmailAddress\": \"email@email.ca\",\"OrgDefinedId\": \"UniqueId1\",\"ProfileBadgeUrl\": null,\"ProfileIdentifier\": \"zzz123\"},\"Role\": {\"Id\": 153,\"Code\": null,\"Name\": \"Commerce Student\"}}]";

public class User
{
    public string Identifier { get; set; }
    public string DisplayName { get; set; }
    public string EmailAddress { get; set; }
    public string OrgDefinedId { get; set; }
    public object ProfileBadgeUrl { get; set; }
    public string ProfileIdentifier { get; set; }
}

public class Role
{
    public int Id { get; set; }
    public object Code { get; set; }
    public string Name { get; set; }
}

public class RootObject
{
    public User User { get; set; }
    public Role Role { get; set; }
}

var items = JsonConvert.DeserializeObject<List<RootObject>>(data);

var items = JsonConvert.DeserializeObject<List<RootObject>>(data)[0];

Try this code I thinks he working good

result:

回答2:

Thanks to Taras for the confirmation, but there is nothing wrong with the code itself.

When using a generic in JsonConver.Deserialize, it gives the error I listed above, however putting in the actual type of OrgUnitUser into the list, rather than T results in the convert succeeding.

Changing the code from

var items = JsonConvert.DeserializeObject<List<T>>(data);

var items = JsonConvert.DeserializeObject<List<OrgUnitUser>>(data);

Fixed the issue

来源：https://stackoverflow.com/questions/34183102/jsonconvert-deserialize-not-recognizing-array

标签

json

json.net

json-deserialization