如何将此JSON字符串反序列化回列表 <T> ？

Question

I am wanting to be able to use JSON to serialize and deserialize a List<T> , where the type is an interface .

I have the code working to serialize the List<T> to a string, but am not sure on how to deserialize the JSON string back into a List<T> .

Here is my code to serialize the List<T> :

List<IAndroidAsset1_1> androidAssets = new List<IAndroidAsset1_1>();

AndroidMapMarkerIconAsset1_1 androidMapMarkerIconAsset1_1 = new AndroidMapMarkerIconAsset1_1();
androidMapMarkerIconAsset1_1.Id = 1;
androidMapMarkerIconAsset1_1.icon = "TestIcon";
androidAssets.Add(androidMapMarkerIconAsset1_1);

AndroidMapMarkerSimpleImageAsset1_1 androidMapMarkerSimpleImageAsset1_1 = new AndroidMapMarkerSimpleImageAsset1_1();
androidMapMarkerSimpleImageAsset1_1.Id = 2;
androidMapMarkerSimpleImageAsset1_1.expiryDate = DateTime.UtcNow;
androidMapMarkerSimpleImageAsset1_1.webAddress = "http://www.test.com";
androidAssets.Add(androidMapMarkerSimpleImageAsset1_1);

string serializedJson = JsonConvert.SerializeObject(androidAssets, Formatting.Indented, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.Objects,
    TypeNameAssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple
});

Here is the code that I have to deserialize the JSON string:

var deserializedObject = JsonConvert.DeserializeObject<IAndroidAsset1_1>(serializedJson, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.Objects
});

Here is the error that I am getting:

An exception of type 'Newtonsoft.Json.JsonSerializationException' occurred in Newtonsoft.Json.dll but was not handled in user code

Additional information: Cannot deserialize the current JSON array (eg [1,2,3]) into type 'CanFindLocation.Interfaces.Android._1_1.IAndroidAsset1_1' because the type requires a JSON object (eg {"name":"value"}) to deserialize correctly.

To fix this error either change the JSON to a JSON object (eg {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (eg ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.

Path '', line 1, position 1.

Can I please have some help to deserialize the JSON string back to a List<T>

Thanks in advance.

Answer 1

You are serailizing a list not a single IAndroidAsset1_1 object, so you need deserialize to List<IAndroidAsset1_1> type not IAndroidAsset1_1 :

var deserializedObject = JsonConvert.DeserializeObject<List<IAndroidAsset1_1>>(serializedJson, new JsonSerializerSettings
{
     TypeNameHandling = TypeNameHandling.Objects
});