我对 SignalR 有一个奇怪的问题,我有一个简单的集线器,它接受这样的模型:
public class Entry
{
public string Version { get; set; }
public Guid PersistedId
{
get { return Id; }
set { Id = value; }
}
public Guid Id { get; set; }
public Guid ParentId { get; set; }
[Required]
public string Content { get; set; }
public DateTime DateCreated { get; set; }
public Guid CreatorAccountId { get; set; }
}
然后我查看请求对象,转到服务器的帖子是:
{"H":"entryhub","M":"SendEntry","A":["{\"Version\":\"1.0.0\",\"PersistedId\":\"00000000-0000-0000-0000-000000000000\",\"ParentId\":\"1764a2e3-ff6f-4a17-9c5f-d99642301dbf\",\"Content\":\"test\",\"DateCreated\":\"2013-07-21T14:06:01.980Z\",\"CreatorAccountId\":\"00000000-0000-0000-0000-000000000000\"}"],"I":2}
我不断收到回复,但有以下例外:
{"I":"2","E":"Error converting value \"{\"Version\":\"1.0.0\",\"PersistedId\":\"00000000-0000-0000-0000-000000000000\",\"ParentId\":\"1764a2e3-ff6f-4a17-9c5f-d99642301dbf\",\"Content\":\"test\",\"DateCreated\":\"2013-07-21T14:06:01.980Z\",\"CreatorAccountId\":\"00000000-0000-0000-0000-000000000000\"}\" to type 'SharedPlugin.Models.Entry'. Path '', line 1, position 266.","T":" at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)\r\n at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)\r\n at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)\r\n at Newtonsoft.Json.JsonSerializer.Deserialize(TextReader reader, Type objectType)\r\n at Microsoft.AspNet.SignalR.Json.JRawValue.ConvertTo(Type type)\r\n at Microsoft.AspNet.SignalR.Hubs.DefaultParameterResolver.ResolveParameter(ParameterDescriptor descriptor, IJsonValue value)\r\n at System.Linq.Enumerable.<ZipIterator>d__7a`3.MoveNext()\r\n at System.Linq.Buffer`1..ctor(IEnumerable`1 source)\r\n at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)\r\n at Microsoft.AspNet.SignalR.Hubs.DefaultParameterResolver.ResolveMethodParameters(MethodDescriptor method, IList`1 values)\r\n at Microsoft.AspNet.SignalR.Hubs.HubDispatcher.InvokeHubPipeline(IHub hub, IJsonValue[] parameterValues, MethodDescriptor methodDescriptor, HubRequest hubRequest, StateChangeTracker tracker)"}
现在我想可能是 Json.net 的底层序列化存在问题,但是我编写了一个单元测试,从 post 请求中获取完全相同的 json 字符串,并将其反序列化为一个 Entry 对象,它工作正常。
我在网上查过,但似乎没有太多关于错误的信息。我认为它可能是日期,但尝试设置我自己的 JsonNetSerializer` 并更改它处理日期、空值、缺少成员等的方式,但是似乎没有任何帮助,并且在单元测试中它除了默认值和工作正常,所以这意味着它不是 Json.net 的问题。