Files
UA-.NETStandard/Applications/ConsoleReferenceClient/Program.cs
T
Marc Schier 712e770fbe Restructure core and built in types into base assembly and nuget (#3326)
This change adds a **new Opc.Ua.Types** nuget that contains core types that do not rely on generated code.  Why the name?  Because almost all code that was in the Types subfolder is part of it, and because we do not want to change the name of the Opc.Ua.Core nuget/assembly because code relies on it.  Any other name like base or bootstrap felt out of place due to the current structure already defining the name "types".  Key design is to depend on only a small set of libraries with limited transitive dependencies, that includes hashcode, logging.abstraction, and for non standard20 builds System.Text.Json (needed for localizedText mul parsing).  Also, key is to support .netstd 2.0 to support source generators and to allow removal of EEC_SUPPORT defines by removing std2.0 from core and all libraries.

The changes are mostly restructuring, and thus small but contain some key changes:

- **Status code** struct now comes with a Symbol field, which is used to carry symbols in case the code is not generated.  Currently (until generated) the status code struct must be manually created with a symbol or the ToSymbolicId extension must be called in the core project.  Future will generate Status code constants just like NodeId that contain the symbol which also removes the reflection-based lookup.  Several tests needed to be adjusted as they checked the status code symbol strings instead of the code.
- **Core identifiers** are copied as they were needed for code to compile, that includes attributes, a subset of status codes and node identifiers.  These will never change so no need to generate them.
- The types folder now contains **encoders**, except for json which is still in core.  Once the json encoder is ported to system.text.json it will also be included and Newtonsoft.Json dropped as dependency (-> #3329).  
- Since types relies on **IOperationContext** and **ISystemContext**, and these export IUserIdentity which relies on crypto, these were split and extended in core with ISessionOperationContext and ISessionSystemContext, which mean changes to ServerSystemContext and introduction of SessionOperationContext and SessionSystemContext classes that extend OperationContext and SystemContext.  Some runtime checks in the server are therefore needed to get at the session and auth info, however, those are anyway optional fields and are not on the critical paths, and thus a type check is in order (and was done in the past already, but against OperationContext class).
- **Manifest resources** are now split between Core (nodeset zip, some generated resoures) and Types (built in bsd/xsds).  This needs to be revisited later if the bsd/xsd need to be regenerated during type generation.  Note that the embedded resource names changed as a result. Since these are only used internally and do not constitute public API this feels reasonable vs duplication of resources in 2 assemblies.
- Reflection however now needs to load not just the built in **encodeables** from Opc.Ua.Types assembly, but also the generated encodeables from Opc.Ua.Core assembly.  For this a new helper Utils method was added to get the Core assembly when linked against Opc.Ua.Core otherwise null.
- Whatever utils methods needed to be split out into the new Opc.Ua.Types assembly, they are now in **CoreUtils** static class in Opc.Ua.Types, and Utils.xxxx forwards to them to ensure minimal changes.  Later we would want to obsolete them in favor of CoreUtils, although it might make sense to split them again into domain specific utilities, such as networking, files, etc
2025-11-10 19:33:24 +01:00

877 lines
38 KiB
C#

/* ========================================================================
* Copyright (c) 2005-2021 The OPC Foundation, Inc. All rights reserved.
*
* OPC Foundation MIT License 1.00
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* The complete license agreement can be found here:
* http://opcfoundation.org/License/MIT/1.00/
* ======================================================================*/
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Opc.Ua;
using Opc.Ua.Client;
using Opc.Ua.Configuration;
namespace Quickstarts.ConsoleReferenceClient
{
/// <summary>
/// The program.
/// </summary>
public static class Program
{
/// <summary>
/// Main entry point.
/// </summary>
/// <exception cref="ErrorExitException"></exception>
public static async Task Main(string[] args)
{
Console.WriteLine("OPC UA Console Reference Client");
Console.WriteLine(
"OPC UA library: {0} @ {1} -- {2}",
Utils.GetAssemblyBuildNumber(),
Utils.GetAssemblyTimestamp().ToString("G", CultureInfo.InvariantCulture),
Utils.GetAssemblySoftwareVersion()
);
// The application name and config file names
const string applicationName = "ConsoleReferenceClient";
const string configSectionName = "Quickstarts.ReferenceClient";
string usage = $"Usage: dotnet {applicationName}.dll [OPTIONS]";
// command line options
bool showHelp = false;
bool autoAccept = false;
string username = null;
byte[] userpassword = null;
string userCertificateThumbprint = null;
byte[] userCertificatePassword = null;
bool logConsole = false;
bool appLog = false;
bool fileLog = false;
bool renewCertificate = false;
bool loadTypes = false;
bool managedbrowseall = false;
bool browseall = false;
bool fetchall = false;
bool jsonvalues = false;
bool verbose = false;
bool subscribe = false;
bool noSecurity = false;
byte[] pfxPassword = null;
int timeout = Timeout.Infinite;
string logFile = null;
string reverseConnectUrlString = null;
bool leakChannels = false;
bool forever = false;
bool enableDurableSubscriptions = false;
var options = new Mono.Options.OptionSet
{
usage,
{ "h|help", "show this message and exit", h => showHelp = h != null },
{
"a|autoaccept",
"auto accept certificates (for testing only)",
a => autoAccept = a != null },
{
"nsec|nosecurity",
"select endpoint with security NONE, least secure if unavailable",
s => noSecurity = s != null
},
{
"un|username=",
"the name of the user identity for the connection",
u => username = u },
{
"up|userpassword=",
"the password of the user identity for the connection",
u => userpassword = Encoding.UTF8.GetBytes(u) },
{
"uc|usercertificate=",
"the thumbprint of the user certificate for the user identity",
u => userCertificateThumbprint = u
},
{
"ucp|usercertificatepassword=",
"the password of the user certificate for the user identity",
u => userCertificatePassword = Encoding.UTF8.GetBytes(u)
},
{ "c|console", "log to console", c => logConsole = c != null },
{ "l|log", "log app output", c => appLog = c != null },
{ "f|file", "log to file", f => fileLog = f != null },
{
"p|password=",
"optional password for private key",
p => pfxPassword = Encoding.UTF8.GetBytes(p)
},
{ "r|renew", "renew application certificate", r => renewCertificate = r != null },
{
"t|timeout=",
"timeout in seconds to exit application",
(int t) => timeout = t * 1000 },
{
"logfile=",
"custom file name for log output",
l =>
{
if (l != null)
{
logFile = l;
}
}
},
{
"lt|loadtypes",
"Load custom types",
lt =>
{
if (lt != null)
{
loadTypes = true;
}
}
},
{
"m|managedbrowseall",
"Browse all references using the MangedBrowseAsync method",
m =>
{
if (m != null)
{
managedbrowseall = true;
}
}
},
{
"b|browseall",
"Browse all references",
b =>
{
if (b != null)
{
browseall = true;
}
}
},
{
"f|fetchall",
"Fetch all nodes",
f =>
{
if (f != null)
{
fetchall = true;
}
}
},
{
"j|json",
"Output all Values as JSON",
j =>
{
if (j != null)
{
jsonvalues = true;
}
}
},
{
"v|verbose",
"Verbose output",
v =>
{
if (v != null)
{
verbose = true;
}
}
},
{
"s|subscribe",
"Subscribe",
s =>
{
if (s != null)
{
subscribe = true;
}
}
},
{
"rc|reverseconnect=",
"Connect using the reverse connect endpoint. (e.g. rc=opc.tcp://localhost:65300)",
url => reverseConnectUrlString = url
},
{
"forever",
"run inner connect/disconnect loop forever",
f =>
{
if (f != null)
{
forever = true;
}
}
},
{
"leakchannels",
"Leave a channel leak open when disconnecting a session.",
l =>
{
if (l != null)
{
leakChannels = true;
}
}
},
{
"ds|durablesubscription",
"SetDurableSubscription example",
ds =>
{
if (ds != null)
{
enableDurableSubscriptions = true;
}
}
}
};
ReverseConnectManager reverseConnectManager = null;
using var telemetry = new ConsoleTelemetry();
ILogger logger = LoggerUtils.Null.Logger;
try
{
// parse command line and set options
string extraArg = ConsoleUtils.ProcessCommandLine(
args,
options,
ref showHelp,
"REFCLIENT",
false
);
// connect Url?
var serverUrl = new Uri("opc.tcp://localhost:62541/Quickstarts/ReferenceServer");
if (!string.IsNullOrEmpty(extraArg))
{
serverUrl = new Uri(extraArg);
}
// log console output to logger
if (logConsole && appLog)
{
logger = telemetry.CreateLogger("Main");
}
// Define the UA Client application
ApplicationInstance.MessageDlg = new ApplicationMessageDlg();
var passwordProvider = new CertificatePasswordProvider(pfxPassword);
var application = new ApplicationInstance(telemetry)
{
ApplicationName = applicationName,
ApplicationType = ApplicationType.Client,
ConfigSectionName = configSectionName,
CertificatePasswordProvider = passwordProvider
};
// load the application configuration.
ApplicationConfiguration config = await application
.LoadApplicationConfigurationAsync(silent: false)
.ConfigureAwait(false);
// override logfile
if (logFile != null)
{
string logFilePath = config.TraceConfiguration.OutputFilePath;
string filename = Path.GetFileNameWithoutExtension(logFilePath);
config.TraceConfiguration.OutputFilePath = logFilePath.Replace(
filename,
logFile,
StringComparison.Ordinal
);
config.TraceConfiguration.DeleteOnLoad = true;
#pragma warning disable CS0618 // Type or member is obsolete
config.TraceConfiguration.ApplySettings();
#pragma warning restore CS0618 // Type or member is obsolete
}
// setup the logging
telemetry.ConfigureLogging(
config,
applicationName,
logConsole,
fileLog,
appLog,
LogLevel.Information);
// delete old certificate
if (renewCertificate)
{
await application.DeleteApplicationInstanceCertificateAsync()
.ConfigureAwait(false);
}
// check the application certificate.
bool haveAppCertificate = await application
.CheckApplicationInstanceCertificatesAsync(false)
.ConfigureAwait(false);
if (!haveAppCertificate)
{
throw new ErrorExitException(
"Application instance certificate invalid!",
ExitCode.ErrorCertificate
);
}
if (reverseConnectUrlString != null)
{
// start the reverse connection manager
logger.LogInformation(
"Create reverse connection endpoint at {Url}.",
reverseConnectUrlString);
reverseConnectManager = new ReverseConnectManager(telemetry);
reverseConnectManager.AddEndpoint(new Uri(reverseConnectUrlString));
reverseConnectManager.StartService(config);
}
// wait for timeout or Ctrl-C
var quitCTS = new CancellationTokenSource();
CancellationToken ct = quitCTS.Token;
ManualResetEvent quitEvent = ConsoleUtils.CtrlCHandler(quitCTS);
var userIdentity = new UserIdentity();
// set user identity of type username/pw
if (!string.IsNullOrEmpty(username))
{
if (userpassword == null)
{
logger.LogInformation(
"No password provided for user {Username}, using empty password.",
username);
}
userIdentity = new UserIdentity(username, userpassword ?? ""u8);
logger.LogInformation(
"Connect with user identity for user {Username}",
username);
}
// set user identity of type certificate
if (!string.IsNullOrEmpty(userCertificateThumbprint))
{
CertificateIdentifier userCertificateIdentifier
= await FindUserCertificateIdentifierAsync(
userCertificateThumbprint,
application.ApplicationConfiguration.SecurityConfiguration
.TrustedUserCertificates,
telemetry,
ct
)
.ConfigureAwait(true);
if (userCertificateIdentifier != null)
{
userIdentity = UserIdentity.CreateAsync(
userCertificateIdentifier,
new CertificatePasswordProvider(userCertificatePassword),
telemetry,
ct
).GetAwaiter().GetResult();
logger.LogInformation(
"Connect with user certificate with Thumbprint {UserCertificateThumbprint}",
userCertificateThumbprint);
}
else
{
logger.LogInformation(
"Failed to load user certificate with Thumbprint {UserCertificateThumbprint}",
userCertificateThumbprint);
}
}
// connect to a server until application stops
bool quit = false;
DateTime start = DateTime.UtcNow;
int waitTime = int.MaxValue;
do
{
if (timeout > 0)
{
waitTime = timeout - (int)DateTime.UtcNow.Subtract(start).TotalMilliseconds;
if (waitTime <= 0)
{
if (!forever)
{
break;
}
waitTime = 0;
}
if (forever)
{
start = DateTime.UtcNow;
}
}
// create the UA Client object and connect to configured server.
using var uaClient = new UAClient(
application.ApplicationConfiguration,
reverseConnectManager,
telemetry,
ClientBase.ValidateResponse
)
{
AutoAccept = autoAccept,
SessionLifeTime = 60_000,
UserIdentity = userIdentity
};
if (enableDurableSubscriptions)
{
uaClient.ReconnectPeriodExponentialBackoff = 60000;
}
bool connected = await uaClient
.ConnectAsync(serverUrl.ToString(), !noSecurity, ct)
.ConfigureAwait(false);
if (connected)
{
logger.LogInformation("Connected! Ctrl-C to quit.");
// enable subscription transfer
uaClient.ReconnectPeriod = 1000;
uaClient.ReconnectPeriodExponentialBackoff = 10000;
uaClient.Session.MinPublishRequestCount = 3;
uaClient.Session.TransferSubscriptionsOnReconnect = true;
var samples = new ClientSamples(
telemetry,
ClientBase.ValidateResponse,
quitEvent,
verbose);
if (loadTypes)
{
Opc.Ua.Client.ComplexTypes.ComplexTypeSystem complexTypeSystem
= await samples
.LoadTypeSystemAsync(uaClient.Session, ct)
.ConfigureAwait(false);
}
if (browseall || fetchall || jsonvalues || managedbrowseall)
{
NodeIdCollection variableIds = null;
NodeIdCollection variableIdsManagedBrowse = null;
ReferenceDescriptionCollection referenceDescriptions = null;
ReferenceDescriptionCollection referenceDescriptionsFromManagedBrowse
= null;
if (browseall)
{
logger.LogInformation("Browse the full address space.");
referenceDescriptions = await samples
.BrowseFullAddressSpaceAsync(uaClient, Objects.RootFolder, ct: ct)
.ConfigureAwait(false);
variableIds =
[
.. referenceDescriptions
.Where(r =>
r.NodeClass == NodeClass.Variable &&
r.TypeDefinition.NamespaceIndex != 0
)
.Select(r => ExpandedNodeId.ToNodeId(
r.NodeId,
uaClient.Session.NamespaceUris))
];
}
if (managedbrowseall)
{
logger.LogInformation("ManagedBrowse the full address space.");
referenceDescriptionsFromManagedBrowse = await samples
.ManagedBrowseFullAddressSpaceAsync(
uaClient,
Objects.RootFolder,
ct: ct)
.ConfigureAwait(false);
variableIdsManagedBrowse =
[
.. referenceDescriptionsFromManagedBrowse
.Where(r =>
r.NodeClass == NodeClass.Variable &&
r.TypeDefinition.NamespaceIndex != 0
)
.Select(r => ExpandedNodeId.ToNodeId(
r.NodeId,
uaClient.Session.NamespaceUris))
];
}
// treat managedBrowseall result like browseall results if the latter is missing
if (!browseall && managedbrowseall)
{
referenceDescriptions = referenceDescriptionsFromManagedBrowse;
browseall = managedbrowseall;
}
IList<INode> allNodes = null;
if (fetchall)
{
allNodes = await samples
.FetchAllNodesNodeCacheAsync(
uaClient,
Objects.RootFolder,
true,
true,
false,
ct: ct)
.ConfigureAwait(false);
variableIds =
[
.. allNodes
.Where(r =>
r.NodeClass == NodeClass.Variable &&
r is VariableNode v &&
v.DataType.NamespaceIndex != 0
)
.Select(r => ExpandedNodeId.ToNodeId(
r.NodeId,
uaClient.Session.NamespaceUris))
];
}
if (jsonvalues && variableIds != null)
{
(
IReadOnlyList<DataValue> allValues,
IReadOnlyList<ServiceResult> results
) = await samples
.ReadAllValuesAsync(uaClient, variableIds, ct)
.ConfigureAwait(false);
}
if (subscribe && (browseall || fetchall))
{
// subscribe to 1000 random variables
const int maxVariables = 1000;
var variables = new NodeCollection();
var random = new Random(62541);
if (fetchall)
{
variables.AddRange(
allNodes
.Where(r =>
r.NodeClass == NodeClass.Variable &&
r.NodeId.NamespaceIndex > 1
)
.Cast<VariableNode>()
.OrderBy(o => random.Next())
.Take(maxVariables)
);
}
else if (browseall)
{
var variableReferences = referenceDescriptions
.Where(r => r.NodeClass == NodeClass.Variable &&
r.NodeId.NamespaceIndex > 1)
.Select(r => r.NodeId)
.OrderBy(o => random.Next())
.Take(maxVariables)
.ToList();
variables.AddRange(
(await uaClient.Session.NodeCache.FindAsync(variableReferences, ct)
.ConfigureAwait(false))
.Cast<Node>()
);
}
await samples
.SubscribeAllValuesAsync(
uaClient,
variableIds: [.. variables],
samplingInterval: 100,
publishingInterval: 1000,
queueSize: 10,
lifetimeCount: 60,
keepAliveCount: 2,
ct: ct
)
.ConfigureAwait(false);
// Wait for DataChange notifications from MonitoredItems
logger.LogInformation(
"Subscribed to {Count} variables. Press Ctrl-C to exit.",
maxVariables);
// free unused memory
uaClient.Session.NodeCache.Clear();
waitTime = timeout -
(int)DateTime.UtcNow.Subtract(start).TotalMilliseconds;
DateTime endTime =
waitTime > 0
? DateTime.UtcNow.Add(TimeSpan.FromMilliseconds(waitTime))
: DateTime.MaxValue;
List<Node>.Enumerator variableIterator = variables.GetEnumerator();
while (!quit && endTime > DateTime.UtcNow)
{
if (variableIterator.MoveNext())
{
try
{
DataValue value = await uaClient
.Session.ReadValueAsync(
variableIterator.Current.NodeId, ct)
.ConfigureAwait(false);
logger.LogInformation(
"Value of {NodeId} is {Value}",
variableIterator.Current.NodeId,
value
);
}
catch (Exception ex)
{
logger.LogInformation(ex,
"Error reading value of {NodeId}",
variableIterator.Current.NodeId
);
}
}
else
{
variableIterator = variables.GetEnumerator();
}
quit = quitEvent.WaitOne(500);
}
}
else
{
quit = true;
}
}
else
{
int quitTimeout = 65_000;
if (enableDurableSubscriptions)
{
quitTimeout = 150_000;
uaClient.ReconnectPeriod = 500_000;
}
NodeId sessionNodeId = uaClient.Session.SessionId;
// Run tests for available methods on reference server.
await samples.ReadNodesAsync(
uaClient.Session,
ct).ConfigureAwait(false);
await samples.WriteNodesAsync(
uaClient.Session,
ct).ConfigureAwait(false);
await samples.BrowseAsync(
uaClient.Session,
ct).ConfigureAwait(false);
await samples.CallMethodAsync(
uaClient.Session,
ct).ConfigureAwait(false);
await samples.EnableEventsAsync(
uaClient.Session,
(uint)quitTimeout,
ct).ConfigureAwait(false);
await samples.SubscribeToDataChangesAsync(
uaClient.Session,
60_000,
enableDurableSubscriptions,
ct).ConfigureAwait(false);
logger.LogInformation("Waiting...");
// Wait for some DataChange notifications from MonitoredItems
int waitCounters = 0;
const int checkForWaitTime = 1000;
const int closeSessionTime = checkForWaitTime * 15;
const int restartSessionTime = checkForWaitTime * 45;
const bool stopNotQuit = false;
int stopCount = 0;
while (!quit && !stopNotQuit && waitCounters < quitTimeout)
{
quit = quitEvent.WaitOne(checkForWaitTime);
waitCounters += checkForWaitTime;
if (enableDurableSubscriptions)
{
if (waitCounters == closeSessionTime &&
uaClient.Session.SubscriptionCount == 1)
{
logger.LogInformation(
"Closing Session (CurrentTime: {Time})",
DateTime.Now.ToLongTimeString());
await uaClient.Session.CloseAsync(closeChannel: false, ct: ct)
.ConfigureAwait(false);
}
if (waitCounters == restartSessionTime)
{
logger.LogInformation("Restarting Session (CurrentTime: {Time})",
DateTime.Now.ToLongTimeString());
await uaClient
.DurableSubscriptionTransferAsync(
serverUrl.ToString(),
useSecurity: !noSecurity,
ct
)
.ConfigureAwait(true);
}
if (waitCounters is > closeSessionTime and < restartSessionTime)
{
Console.WriteLine(
"No Communication Interval " +
stopCount.ToString(CultureInfo.InvariantCulture)
);
stopCount++;
}
}
}
}
logger.LogInformation("Client disconnected.");
await uaClient.DisconnectAsync(leakChannels, ct).ConfigureAwait(false);
}
else
{
logger.LogInformation(
"Could not connect to server! Retry in 10 seconds or Ctrl-C to quit.");
quit = quitEvent.WaitOne(Math.Min(10_000, waitTime));
}
} while (!quit);
logger.LogInformation("Client stopped.");
}
catch (Exception ex)
{
logger.LogInformation("{Error}", ex.Message);
}
finally
{
Utils.SilentDispose(reverseConnectManager);
}
}
/// <summary>
/// returns a CertificateIdentifier of the Certificate with the specified thumbprint
/// if it is found in the trustedUserCertificates TrustList
/// </summary>
/// <param name="thumbprint">the thumbprint of the certificate to select</param>
/// <param name="trustedUserCertificates">the trustlist of the user certificates</param>
/// <param name="ct">the cancellation token</param>
/// <returns>Certificate Identifier</returns>
private static async Task<CertificateIdentifier> FindUserCertificateIdentifierAsync(
string thumbprint,
CertificateTrustList trustedUserCertificates,
ITelemetryContext telemetry,
CancellationToken ct = default)
{
CertificateIdentifier userCertificateIdentifier = null;
X509Certificate2Collection userCertificatesWithMatchingThumbprint =
await trustedUserCertificates.GetCertificatesAsync(telemetry, ct).ConfigureAwait(false);
// get user certificate with matching thumbprint
userCertificatesWithMatchingThumbprint =
userCertificatesWithMatchingThumbprint.Find(X509FindType.FindByThumbprint, thumbprint, false);
// create Certificate Identifier
if (userCertificatesWithMatchingThumbprint.Count == 1)
{
userCertificateIdentifier = new CertificateIdentifier(
userCertificatesWithMatchingThumbprint[0])
{
StorePath = trustedUserCertificates.StorePath,
StoreType = trustedUserCertificates.StoreType
};
}
return userCertificateIdentifier;
}
/// <summary>
/// A dialog which asks for user input.
/// </summary>
public class ApplicationMessageDlg : IApplicationMessageDlg
{
private readonly TextWriter m_output;
private string m_message = string.Empty;
private bool m_ask;
public ApplicationMessageDlg(TextWriter output = null)
{
m_output = output ?? Console.Out;
}
public override void Message(string text, bool ask)
{
m_message = text;
m_ask = ask;
}
public override async Task<bool> ShowAsync()
{
if (m_ask)
{
var message = new StringBuilder(m_message);
message.Append(" (y/n, default y): ");
m_output.Write(message.ToString());
try
{
ConsoleKeyInfo result = Console.ReadKey();
m_output.WriteLine();
return await Task.FromResult(result.KeyChar is 'y' or 'Y' or '\r')
.ConfigureAwait(false);
}
catch
{
// intentionally fall through
}
}
else
{
m_output.WriteLine(m_message);
}
return await Task.FromResult(true).ConfigureAwait(false);
}
}
}
}