微信小程序与AspNetCore SignalR聊天实例代码

public class OnlineClient
{
 public string NickName { get; set; }
 public string Avatar { get; set; }
}

public override async Task OnConnectedAsync()
{
 var http = Context.GetHttpContext();
 var client = new OnlineClient()
 {
  NickName = http.Request.Query["nickName"],
  Avatar = http.Request.Query["avatar"]
 };
 lock (SyncObj)
 {
 OnlineClients[Context.ConnectionId] = client;
 }
 await base.OnConnectedAsync();
 await Groups.AddToGroupAsync(Context.ConnectionId, ChatName);
 await Clients.GroupExcept(ChatName, new[] { Context.ConnectionId }).SendAsync("system", $"用户{client.NickName}加入了群聊");
 await Clients.Client(Context.ConnectionId).SendAsync("system", $"成功加入{ChatName}");
 }

public override async Task OnDisconnectedAsync(Exception exception)
{
 await base.OnDisconnectedAsync(exception);
 bool isRemoved;
 OnlineClient client;
 lock (SyncObj)
 {
 isRemoved = OnlineClients.TryRemove(Context.ConnectionId, out client);
 }
 await Groups.RemoveFromGroupAsync(Context.ConnectionId, ChatName);
 if (isRemoved)
 {
 await Clients.GroupExcept(ChatName, new[] { Context.ConnectionId }).SendAsync("system", $"用户{client.NickName}退出了群聊");
 }
} 

 public async Task SendMessage(string msg)
{
 var client = OnlineClients.Where(x => x.Key == Context.ConnectionId).Select(x=>x.Value).FirstOrDefault();
 if (client == null)
 {
 await Clients.Client(Context.ConnectionId).SendAsync("system", "您已不在聊天室,请重新加入");
 }
 else
 {
 await Clients.GroupExcept(ChatName, new[] { Context.ConnectionId }).SendAsync("receive", new { msg, nickName = client.NickName, avatar = client.Avatar });
 }
}

onLoad: function (options) {
 this.hubConnect = new Hub.HubConnection();
 this.hubConnect.start("https://chat.jingshonline.net/chat", { nickName: app.globalData.userInfo.nickName, avatar: app.globalData.userInfo.avatarUrl });
 this.hubConnect.onOpen = res => {
 console.log("成功开启连接")
 }
 this.hubConnect.on("system", res => {
 wx.showModal({
 title: '系统消息',
 content: res,
 })
 })
 this.hubConnect.on("receive", res => {
 centendata.push({
 content: res.msg,
 time: new Date().toLocaleString(),
 head_owner: res.avatar,
 is_show_right: 0
 });
 this.setData({
 centendata: centendata
 })
 })
 }

onUnload: function () {
 this.hubConnect.close({ reason: "退出" })
}

this.hubConnect.send("sendMessage",message);