public static async Task <ChannelReader <TResult> > StreamAsChannelAsync <TResult>(this HubConnection hubConnection, string methodName, object[] args, CancellationToken cancellationToken = default)
{
if (hubConnection == null)
{
throw new ArgumentNullException(nameof(hubConnection));
}
var inputChannel = await hubConnection.StreamAsChannelAsync(methodName, typeof(TResult), args, cancellationToken);
var outputChannel = Channel.CreateUnbounded <TResult>();
// Local function to provide a way to run async code as fire-and-forget
// The output channel is how we signal completion to the caller.
async Task RunChannel()
{
try
{
while (await inputChannel.WaitToReadAsync())
{
while (inputChannel.TryRead(out var item))
{
while (!outputChannel.Writer.TryWrite((TResult)item))
{
if (!await outputChannel.Writer.WaitToWriteAsync())
{
// Failed to write to the output channel because it was closed. Nothing really we can do but abort here.
return;
}
}
}
}
// Manifest any errors in the completion task
await inputChannel.Completion;
}
catch (Exception ex)
{
outputChannel.Writer.TryComplete(ex);
}
finally
{
// This will safely no-op if the catch block above ran.
outputChannel.Writer.TryComplete();
}
}
_ = RunChannel();
return(outputChannel.Reader);
}
public static Task <ChannelReader <TResult> > StreamAsChannelAsync <TResult>(this HubConnection hubConnection, string methodName, object arg1, CancellationToken cancellationToken = default)
{
return(hubConnection.StreamAsChannelAsync <TResult>(methodName, new object[] { arg1 }, cancellationToken));
}
public static Task <ChannelReader <TResult> > StreamAsChannelAsync <TResult>(this HubConnection hubConnection, string methodName, object arg1, object arg2, object arg3, object arg4, object arg5, object arg6, object arg7, object arg8, object arg9, object arg10, CancellationToken cancellationToken = default)
{
return(hubConnection.StreamAsChannelAsync <TResult>(methodName, new object[] { arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10 }, cancellationToken));
}
public static Task <ChannelReader <TResult> > StreamAsChannelAsync <TResult>(this HubConnection hubConnection, string methodName, CancellationToken cancellationToken = default)
{
return(hubConnection.StreamAsChannelAsync <TResult>(methodName, Array.Empty <object>(), cancellationToken));
}
