// End sample
// Sample: UseTracerRunIn
/// <summary>
/// The <see cref="IManagedTracer"/> is populated by dependency injection.
/// </summary>
public void TraceHelloWorldRunIn(IManagedTracer tracer)
{
// Manually trace a specific Action or Func<T>.
tracer.RunInSpan(
() => Console.Out.WriteLine("Hello, World!"),
nameof(TraceHelloWorldRunIn));
}
public async Task TraceSingleAsync(Func <IHostBuilder> createHostBuilder)
{
IHost host = null;
try
{
host = createHostBuilder().Build();
await host.StartAsync();
ITraceContext traceContext = new SimpleTraceContext(null, null, true);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
using (tracer.StartSpan(_testId))
{
IManagedTracer currentTracer = host.Services.GetRequiredService <IManagedTracer>();
currentTracer.RunInSpan(
() => Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app"),
"testing_tracing");
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "testing_tracing");
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}
// End sample
// Sample: UseTracerRunIn
/// <summary>
/// Manually trace a specific Action or Func<T>.
/// The <see cref="IManagedTracer"/> is populated by dependency injection
/// thanks to the use of the <see cref="FromServicesAttribute"/> attribute.
/// </summary>
public void TraceHelloWorldRunIn(string id, [FromServices] IManagedTracer tracer)
{
tracer.RunInSpan(
// The Action or Func<T> to be traced.
() =>
{
// The code whose execution is to be included in the span goes here.
ViewData["Message"] = "Hello World.";
},
// The name of the span.
id);
}
public async Task TraceSingleAsync()
{
IHost host = null;
try
{
host = TroubleshootingHostBuilder.CreateHostBuilder().Build();
await host.StartAsync();
// Sample: SingleContext
ITraceContext traceContext = new SimpleTraceContext(null, null, true);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
// End sample
// Let's just start a span with the test ID so we can find it faster.
// But we don't show this in sample code.
using (tracer.StartSpan(_testId))
{
// Sample: RunIn
IManagedTracer currentTracer = host.Services.GetRequiredService <IManagedTracer>();
currentTracer.RunInSpan(
() => Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app"),
"testing_tracing");
// End sample
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "testing_tracing");
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}