SignalR InvalidDataException C#
SignalR InvalidDataException C#
提问于 2021-04-07 18:08:04
我正在使用WPF上的客户端和SignalR上的服务器部分来制作一个信使。问题是，我不完全理解为什么ChatHub类中的方法：SendMessage s不能工作，尽管JoinChatGroup是这样的。
错误：Microsoft.AspNetCore.SignalR.HubException: "Failed to invoke 'SendMessages' due to an error on the server. InvalidDataException: Error binding arguments. Make sure that the types of the provided values match the types of the hub method being invoked."
服务器端：
枢纽级：
public class ChatHub : Hub
{
public async Task SendMessages(Message message)
{
await Clients.Group(message.Chat_id.ToString()).SendAsync("ReceiveMessage", message);
Console.WriteLine("Сообщение успешно отправлено!");
}
public async Task JoinChatGroup(string chatId)
{
await Groups.AddToGroupAsync(Context.ConnectionId, chatId);
Console.WriteLine("Успешно добавлен в группу!");
}
} 客户端：
public class SignalRService
{
private HubConnection hub = new HubConnectionBuilder()
.WithUrl("http://localhost:5000/Chat")
.Build();
public event Action<Message> MessageReceived;
public async void StartConnection()
{
await hub.StartAsync();
hub.On<Message>("ReceiveMessage", (message) => MessageReceived.Invoke(message));
}
public async Task addToGroup(string chatId)
{
await hub.InvokeAsync<string>("JoinChatGroup", chatId);
}
public async Task SendMessage(Message message)
{
await hub.InvokeAsync<Message>("SendMessages", message);
}
}消息模型
public class Message
{
public int ID { get; set; }
public int User_id { get; set; }
public int Chat_id { get; set; }
public int ContentType { get; set; }
public byte[] Content { get; set; }
public Message(int user_id, int chat_id, int contentType, byte[] content)
{
User_id = user_id;
Chat_id = chat_id;
ContentType = contentType;
Content = content;
}
public Message(int iD, int user_id, int chat_id, int contentType, byte[] content)
{
ID = iD;
User_id = user_id;
Chat_id = chat_id;
ContentType = contentType;
Content = content;
}回答 1
Stack Overflow用户
回答已采纳
发布于 2021-04-07 18:13:09
您的Message类需要一个空的构造函数来支持序列化：
public class Message
{
// this constructor
public Message()
{
}
public int ID { get; set; }
public int User_id { get; set; }
public int Chat_id { get; set; }
public int ContentType { get; set; }
public byte[] Content { get; set; }
public Message(int user_id, int chat_id, int contentType, byte[] content)
{
User_id = user_id;
Chat_id = chat_id;
ContentType = contentType;
Content = content;
}
public Message(int iD, int user_id, int chat_id, int contentType, byte[] content)
{
ID = iD;
User_id = user_id;
Chat_id = chat_id;
ContentType = contentType;
Content = content;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66991782
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