Question

此代码：

var commandMessage = new CommandMessage { CorrelationId = Guid.NewGuid() };
var json = JsonConvert.SerializeObject(commandMessage);
var myCommandMessage = (CommandMessage)JsonConvert.DeserializeObject(json);

给出了以下错误消息：

Additional information: Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'QueueConnectionStringTester.CommandMessage'

这是CommandMessage类：

public class CommandMessage
{
    public Guid CorrelationId { get; set; }        
}

我在这里缺少什么？

Answer 1

您需要在反序列化时指定类型。

或者：

var myCommandMessage = JsonConvert.DeserializeObject<CommandMessage>(json);

或者：

var myCommandMessage = (CommandMessage)JsonConvert.DeserializeObject(json, typeof(CommandMessage));

Answer 2

您需要提供类型。 JsonConvert类对CommandMessage类

一无所知

    public class CommandMessage
    {
        public Guid CorrelationId { get; set; }
    }

    static void Main(string[] args)
    {
        var commandMessage = new CommandMessage { CorrelationId = Guid.NewGuid() };
        var json = JsonConvert.SerializeObject(commandMessage);
        var myCommandMessage =  JsonConvert.DeserializeObject<CommandMessage>(json);
    }

无法将类型为“Newtonsoft.Json.Linq.JObject”的对象强制转换为<myclass>类型

2 个答案: