asp.net core 5 logging code example
Example 1: .net core logging level
namespace Microsoft.Extensions.Logging
{
/// <summary>
/// Defines logging severity levels.
/// </summary>
public enum LogLevel
{
/// <summary>
/// Logs that contain the most detailed messages. These messages may contain sensitive application data.
/// These messages are disabled by default and should never be enabled in a production environment.
/// </summary>
Trace = 0,
/// <summary>
/// Logs that are used for interactive investigation during development. These logs should primarily contain
/// information useful for debugging and have no long-term value.
/// </summary>
Debug = 1,
/// <summary>
/// Logs that track the general flow of the application. These logs should have long-term value.
/// </summary>
Information = 2,
/// <summary>
/// Logs that highlight an abnormal or unexpected event in the application flow, but do not otherwise cause the
/// application execution to stop.
/// </summary>
Warning = 3,
/// <summary>
/// Logs that highlight when the current flow of execution is stopped due to a failure. These should indicate a
/// failure in the current activity, not an application-wide failure.
/// </summary>
Error = 4,
/// <summary>
/// Logs that describe an unrecoverable application or system crash, or a catastrophic failure that requires
/// immediate attention.
/// </summary>
Critical = 5,
/// <summary>
/// Not used for writing log messages. Specifies that a logging category should not write any messages.
/// </summary>
None = 6,
}
}
Example 2: asp.net core logger in startup
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILogger<Startup> logger)
{
logger.LogInformation("Configure called");
// …
}