Signalr Client results
Published in
1 min readDec 28, 2022
ASP.NET Core 7 supports requesting a result from a client, in this article, we will show you how to use client results with the ABP framework.
Create a SignalR hub
public class ChatHub:AbpHub
{
public async Task<string> WaitForMessage(stringconnectionId
{
varmessage=awaitClients.Client(connectionId).InvokeAsync<string>("GetMessage");
returnmessage;
}
}
- ChatHub inherits from
AbpHub
that has useful base properties likeCurrentUser
. - Define the
WaitForMessage
method to call the client'sGetMessage
method and get the return value.
Using
InvokeAsync
from a Hub method requires setting the MaximumParallelInvocationsPerClient option to a value greater than 1.
Client
Clients should return results in their .On(...)
handlers.
.NET Client
hubConnection.On("GetMessage",async ()=>
{
Console.WriteLine("Enter message:");
varmessage=awaitConsole.In.ReadLineAsync()
;returnmessage;
});
JavaScript client
connection.on("GetMessage",function(){
constmessage=prompt("Enter message:");
returnmessage;
});
Strongly-typed hubs
We can use strongly-typed instead of InvokeAsync
by inheriting from AbpHub<T>
or Hub<T>
:
public interface IClient
{
Task<string> GetMessage();
}
public class ChatHub : AbpHub<IClient>
{
public async Task<string> WaitForMessage(stringconnectionId)
{
string message = awaitClients.Client(connectionId).GetMessage();
returnmessage;
}
}