The : separator doesn't work with environment variable hierarchical keys on all platforms. Log level can be set by any of the configuration providers. Set log level by command line, environment variables, and other configuration Var logger = loggerFactory.CreateLogger() Using var loggerFactory = LoggerFactory.Create(builder =>īuilder.AddSimpleConsole(i => i.ColorBehavior = LoggerColorBehavior.Disabled) ![]() The following example calls AddSimpleConsole in Program.cs, disables color output, and logs the /Test endpoint: using Logger.LogInformation("Testing logging in Program.cs") Īwait ("Testing") Var logger = LoggerFactory.Create(config => The following example calls AddConsole in Program.cs and logs the /Test endpoint: var builder = WebApplication.CreateBuilder(args) The following example calls in Program.cs and logs informational messages: var builder = WebApplication.CreateBuilder(args) Īpp.Logger.LogInformation("Adding Routes") Īpp.Logger.LogInformation("Starting the app") Each provider defines an alias that can be used in configuration in place of the fully qualified type name. For example, the level in overrides the level in LogLevel.Default. _logger.LogInformation("About page visited at placeholder is the provider name. The Log level indicates the severity of the logged event. Calls LogInformation to log at the Information level.The log category is a string that is associated with each log. Creates a logger, ILogger, which uses a log category of the fully qualified name of the type AboutModel.To create logs, use an ILogger object from dependency injection (DI). The following code overrides the default set of logging providers added by WebApplication.CreateBuilder: var builder = WebApplication.CreateBuilder(args) Īlternatively, the preceding logging code can be written as follows: var builder = WebApplication.CreateBuilder() ![]() The next several sections provide samples based on the ASP.NET Core web app templates, which use the Generic Host. The preceding code shows the Program.cs file created with the ASP.NET Core web app templates. Var builder = WebApplication.CreateBuilder(args)
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