随着最近对2018年9月Azure功能应用程序版本2的更改，我的功能应用程序代码被重构。但是，似乎：
在LogWithILogger（）调用中，下面的示例应用程序中重复了该问题。另外两点：
（1）我注意到默认的过滤器跟踪级别似乎是硬编码的。可以添加另一个过滤器以允许LogTrace（）工作，还是不再使用LogTrace（）？如果可以添加另一个过滤器，如何将必要的对象注入功能应用程序以允许这样做？
public static void Microsoft.Extensions.Logging.AddDefaultWebJobsFilter(this ILoggingBuilder builder)
{
builder.SetMinimumLevel(LogLevel.None);
builder.AddFilter((c,l) => Filter(c, l, LogLevel.Information));
}
（2）LogLevel周围的Intellisense指示：
包含最详细消息的日志。这些消息可能包含敏感的应用程序数默认情况下禁用这些消息，并且永远不应在生产环境中启用这些消息。
我希望在调试时可以将LogTrace用于控制台窗口 - 并且可以通过categoryLevel设置进行控制。
那么，在使用ILogger为V2 Function应用程序编写跟踪消息方面应该做些什么呢？感谢您的建议！
样品申请
Function1.cs
using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.WebJobs.Description;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
namespace FunctionAppTestLogging
{
[AttributeUsage(AttributeTargets.Parameter)]
[Binding]
public class InjectAttribute : Attribute
{
public InjectAttribute(Type type)
{
Type = type;
}
public Type Type { get; }
}
public class WebJobsExtensionStartup : IWebJobsStartup
{
public void Configure(IWebJobsBuilder webjobsBuilder)
{
webjobsBuilder.Services.AddLogging(builder => builder.SetMinimumLevel(LogLevel.Trace).AddFilter("Function", LogLevel.Trace));
ServiceCollection serviceCollection = (ServiceCollection) webjobsBuilder.Services;
IServiceProvider serviceProvider = webjobsBuilder.Services.BuildServiceProvider();
// webjobsBuilder.Services.AddLogging();
// webjobsBuilder.Services.AddSingleton(new LoggerFactory());
// loggerFactory.AddApplicationInsights(serviceProvider, Extensions.Logging.LogLevel.Information);
}
}
public static class Function1
{
private static string _configuredLoggingLevel;
[FunctionName("Function1")]
public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequest req, ILogger log, ExecutionContext context) // , [Inject(typeof(ILoggerFactory))] ILoggerFactory loggerFactory) // , [Inject(typeof(ILoggingBuilder))] ILoggingBuilder loggingBuilder)
{
LogWithILogger(log);
LogWithSeriLog();
SetupLocalLoggingConfiguration(context, log);
LogWithWrappedILogger(log);
return await RunStandardFunctionCode(req);
}
private static void SetupLocalLoggingConfiguration(ExecutionContext context, ILogger log)
{
var config = new ConfigurationBuilder()
.SetBasePath(context.FunctionAppDirectory)
.AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables()
.Build();
// Access AppSettings when debugging locally.
string loggingLevel = config["LoggingLevel"]; // This needs to be set in the Azure Application Settings for it to work in the cloud.
_configuredLoggingLevel = loggingLevel;
}
private static void LogWithWrappedILogger(ILogger log)
{
LogWithWrappedILoggerHelper("This is Critical information from WrappedILogger", LogLevel.Critical, log);
LogWithWrappedILoggerHelper("This is Error information from WrappedILogger", LogLevel.Error, log);
LogWithWrappedILoggerHelper("This is Information information from WrappedILogger", LogLevel.Information, log);
LogWithWrappedILoggerHelper("This is Debug information from WrappedILogger", LogLevel.Debug, log);
LogWithWrappedILoggerHelper("This is TRACE information from WrappedILogger", LogLevel.Trace, log);
}
private static void LogWithWrappedILoggerHelper(string message, LogLevel messageLogLevel, ILogger log)
{
// This works as expected - Is the host.json logger section not being respected?
Enum.TryParse(_configuredLoggingLevel, out LogLevel logLevel);
if (messageLogLevel >= logLevel)
{
log.LogInformation(message);
}
}
private static void LogWithILogger(ILogger log)
{
var logger = log;
// Microsoft.Extensions.Logging.Logger _logger = logger; // Logger is protected - so not accessible.
log.LogCritical("This is critical information!!!");
log.LogDebug("This is debug information!!!");
log.LogError("This is error information!!!");
log.LogInformation("This is information!!!");
log.LogWarning("This is warning information!!!");
log.LogTrace("This is TRACE information!! from LogTrace");
log.Log(LogLevel.Trace, "This is TRACE information from Log", null);
}
private static void LogWithSeriLog()
{
// Code using the Serilog.Sinks.AzureTableStorage package per https://docs.microsoft.com/en-us/sandbox/functions-recipes/logging?tabs=csharp
/*
var serilog = new LoggerConfiguration()
.WriteTo.AzureTableStorage(connectionString, storageTableName: tableName, restrictedToMinimumLevel: LogEventLevel.Verbose)
.CreateLogger();
log.Debug("Here is a debug message {message}", "with some structured content");
log.Verbose("Here is a verbose log message");
log.Warning("Here is a warning log message");
log.Error("Here is an error log message");
*/
}
private static async Task<IActionResult> RunStandardFunctionCode(HttpRequest req)
{
string name = req.Query["name"];
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
name = name ?? data?.name;
return name != null
? (ActionResult)new OkObjectResult($"Hello, {name}")
: new BadRequestObjectResult("Please pass a name on the query string or in the request body");
}
}
}
host.json
{
"version": "2.0",
// The Azure Function App DOES appear to read from host.json even when debugging locally thru VS, since it complains if you do not use a valid level.
"logger": {
"categoryFilter": {
"defaultLevel": "Trace", // Trace, Information, Error
"categoryLevels": {
"Function": "Trace"
}
}
}
对于v2函数，log setting中的host.json具有不同的格式。
{
"version": "2.0",
"logging": {
"fileLoggingMode": "debugOnly",
"logLevel": {
// For specific function
"Function.Function1": "Trace",
// For all functions
"Function":"Trace",
// Default settings, e.g. for host
"default": "Trace"
}
}
}