SignalR解析值时遇到意外字符:<

问题描述

我正在使用WinRT客户端.当我尝试发送消息时，我收到此异常.

I am using a WinRT client. I receive this exception when I try to send a message.

解析值时遇到意外字符:<.

Unexpected character encountered while parsing value: <.

当您将对象发送到集线器，并且该对象未在集线器上定义时，会发生问题.该对象是可绑定对象(ViewModel).我不想在Web项目中包含所有属性通知更改内容.

The problem occurs when you send an object to the hub, and the object is not defined on the hub. The object is a Bindable object (ViewModel). I don't want to include all the property notify change stuff on the web project.

客户代码

return Proxy.Invoke("PlayerUpdate", sessionData);

尝试让集线器接受一个对象"参数

Try one was to have the hub accept an 'object' parameter

public async Task PlayerUpdate(string group, object sessionData)
{
 await Clients[group].PlayerUpdate(sessionData);
}

尝试两个是让集线器接受一个(json)'string'参数

Try two was to have the hub accept an (json) 'string' parameter

public async Task PlayerUpdate(string group, string sessionData)
{
 await Clients[group].PlayerUpdate(sessionData);
}

尝试三是对对象客户端进行预序列化

Try three was to pre-serialize the object client side

var str = JsonConvert.SerializeObject(refresh);
return Proxy.Invoke("PlayerUpdate", str);

什么都没有.计划4是在共享库中定义一些要发送的数据传输对象.我真的不想这样做，因为它将使我的代码加倍.

Nothing is working. Plan 4 is to define some data transfer objects in a shared libarary to send. I really dont want to do that as It will about double my code.

推荐答案

已解决.

我的回购项目很好，所以我得出结论是其他问题.

My repo project was fine, so I concluded that something else was the matter.

经过一些实验，我发现真正的问题是我的HUB方法中的参数不正确.简而言之，当我的集线器方法仅接受1个参数时，我正在发送2个参数.

After some experimentation I discovered the real problem was that I had incorrect parameters in my HUB method. Simply put, I was sending 2 parameters when my hub methods only accepted 1.

感谢您的关注，对您的困惑感到抱歉.也许更好的异常消息是有条理的?

Thanks for the interest, sorry for the confusion. Perhaps a better exception message is in order?

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