public async Task <IEnumerable <string> > PrerenderComponentAsync(ComponentPrerenderingContext prerenderingContext)
{
var context = prerenderingContext.Context;
var circuitHost = _circuitFactory.CreateCircuitHost(
context,
client: CircuitClientProxy.OfflineClient,
GetFullUri(context.Request),
GetFullBaseUri(context.Request));
// We don't need to unsubscribe because the circuit host object is scoped to this call.
circuitHost.UnhandledException += CircuitHost_UnhandledException;
// For right now we just do prerendering and dispose the circuit. In the future we will keep the circuit around and
// reconnect to it from the ComponentsHub. If we keep the circuit/renderer we also need to unsubscribe this error
// handler.
try
{
return(await circuitHost.PrerenderComponentAsync(
prerenderingContext.ComponentType,
prerenderingContext.Parameters));
}
finally
{
await circuitHost.DisposeAsync();
}
}
private CircuitHost GetOrCreateCircuitHost(HttpContext context)
{
if (context.Items.TryGetValue(CircuitHostKey, out var existingHost))
{
return((CircuitHost)existingHost);
}
else
{
var result = _circuitFactory.CreateCircuitHost(
context,
client: new CircuitClientProxy(), // This creates an "offline" client.
GetFullUri(context.Request),
GetFullBaseUri(context.Request));
result.UnhandledException += CircuitHost_UnhandledException;
context.Response.OnCompleted(() =>
{
result.UnhandledException -= CircuitHost_UnhandledException;
_registry.RegisterDisconnectedCircuit(result);
return(Task.CompletedTask);
});
context.Items.Add(CircuitHostKey, result);
return(result);
}
}
public async Task <IEnumerable <string> > PrerenderComponentAsync(ComponentPrerenderingContext prerenderingContext)
{
var context = prerenderingContext.Context;
var circuitHost = _circuitFactory.CreateCircuitHost(
context,
client: null,
GetFullUri(context.Request),
GetFullBaseUri(context.Request));
// For right now we just do prerendering and dispose the circuit. In the future we will keep the circuit around and
// reconnect to it from the ComponentsHub.
try
{
return(await circuitHost.PrerenderComponentAsync(
prerenderingContext.ComponentType,
prerenderingContext.Parameters));
}
finally
{
await circuitHost.DisposeAsync();
}
}