public static void ShouldBe(this ComponentRenderedText componentRenderedText, string expectedHtml)
{
var testHtml = string.Concat(componentRenderedText.Tokens).Trim();
var diffResult = CreateDiff(expectedHtml, testHtml);
diffResult.HasDifferences().ShouldBeFalse(CreateValidationErrorMessage(expectedHtml, testHtml, diffResult));
}
public async Task <ComponentPrerenderResult> PrerenderComponentAsync(ComponentPrerenderingContext prerenderingContext)
{
var context = prerenderingContext.Context;
var navigationStatus = GetOrCreateNavigationStatus(context);
if (navigationStatus.Navigated)
{
// Avoid creating a circuit host if other component earlier in the pipeline already triggered
// a navigation request. Instead rendre nothing
return(new ComponentPrerenderResult(Array.Empty <string>()));
}
var circuitHost = GetOrCreateCircuitHost(context, navigationStatus);
ComponentRenderedText renderResult = default;
try
{
renderResult = await circuitHost.PrerenderComponentAsync(
prerenderingContext.ComponentType,
prerenderingContext.Parameters);
}
catch (NavigationException navigationException)
{
// Cleanup the state as we won't need it any longer.
// Signal callbacks that we don't have to register the circuit.
await CleanupCircuitState(context, navigationStatus, circuitHost);
// Navigation was attempted during prerendering.
if (prerenderingContext.Context.Response.HasStarted)
{
// We can't perform a redirect as the server already started sending the response.
// This is considered an application error as the developer should buffer the response until
// all components have rendered.
throw new InvalidOperationException("A navigation command was attempted during prerendering after the server already started sending the response. " +
"Navigation commands can not be issued during server-side prerendering after the response from the server has started. Applications must buffer the" +
"reponse and avoid using features like FlushAsync() before all components on the page have been rendered to prevent failed navigation commands.", navigationException);
}
context.Response.Redirect(navigationException.Location);
return(new ComponentPrerenderResult(Array.Empty <string>()));
}
circuitHost.Descriptors.Add(new ComponentDescriptor
{
ComponentType = prerenderingContext.ComponentType,
Prerendered = true
});
var result = (new[] {
$"<!-- M.A.C.Component:{{\"circuitId\":\"{circuitHost.CircuitId}\",\"rendererId\":\"{circuitHost.Renderer.Id}\",\"componentId\":\"{renderResult.ComponentId}\"}} -->",
}).Concat(renderResult.Tokens).Concat(
new[] {
$"<!-- M.A.C.Component: {renderResult.ComponentId} -->"
});
return(new ComponentPrerenderResult(result));
}
public async Task <IEnumerable <string> > PrerenderComponentAsync(
ParameterCollection parameters,
HttpContext httpContext,
Type componentType)
{
var dispatcher = Renderer.CreateDefaultDispatcher();
InitializeUriHelper(httpContext);
var loggerFactory = (ILoggerFactory)httpContext.RequestServices.GetService(typeof(ILoggerFactory));
using (var htmlRenderer = new HtmlRenderer(httpContext.RequestServices, loggerFactory, dispatcher, _encoder.Encode))
{
ComponentRenderedText result = default;
try
{
result = await dispatcher.InvokeAsync(() => htmlRenderer.RenderComponentAsync(
componentType,
parameters));
}
catch (NavigationException navigationException)
{
// Navigation was attempted during prerendering.
if (httpContext.Response.HasStarted)
{
// We can't perform a redirect as the server already started sending the response.
// This is considered an application error as the developer should buffer the response until
// all components have rendered.
throw new InvalidOperationException("A navigation command was attempted during prerendering after the server already started sending the response. " +
"Navigation commands can not be issued during server-side prerendering after the response from the server has started. Applications must buffer the" +
"reponse and avoid using features like FlushAsync() before all components on the page have been rendered to prevent failed navigation commands.", navigationException);
}
httpContext.Response.Redirect(navigationException.Location);
return(Array.Empty <string>());
}
return(result.Tokens);
}
}
