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在DotNetCoreMicrosoft.Extensions.Logging

如果我将日志记录级别设置为信息，将

_logger.LogDebug(JsonConvert.SerializeObject(address));

评价

JsonConvert.SerializeObject(address)

部分？如果是，知道如何防止它不会在生产中使用过多的资源吗？

提前致谢

Answer 1

看了源码稍微想了一下：是的，不管函数是什么，它都会一直求值。你所做的与此类似：

string json = JsonConvert.SerializeObject(address); 
_logger.LogDebug(json);

因为参数是在调用函数之前求值的。

在生产中不会发生的是该函数不会执行任何操作。

Answer 2

实现具有 "conditional" 属性的扩展方法达到目的。
我还确认他们到目前为止没有任何实施 details

public static class LoggerExtensionsHelper
{
    public const string Debug = "DEBUG";
    public const string Trace = "TRACE";

    /// <summary>Formats and writes a debug log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Debug)]
    public static void LogDebug(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogDebug(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes a debug log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Debug)]
    public static void LogDebug(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogDebug(logger, eventId, message, args);
    }

    /// <summary>Formats and writes a debug log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Debug)]
    public static void LogDebug(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogDebug(logger, message, args);
    }

    /// <summary>Formats and writes a trace log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Trace)]
    public static void LogTrace(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogTrace(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes a trace log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Trace)]
    public static void LogTrace(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogTrace(logger, eventId, message, args);
    }

    /// <summary>Formats and writes a trace log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    [Conditional(Trace)]
    public static void LogTrace(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogTrace(logger, message, args);
    }


    /// <summary>Formats and writes an informational log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogInformation(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogInformation(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes an informational log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogInformation(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogInformation(logger, eventId, message, args);
    }

    /// <summary>Formats and writes an informational log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogInformation(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogInformation(logger, message, args);
    }

    /// <summary>Formats and writes a warning log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogWarning(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogWarning(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes a warning log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogWarning(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogWarning(logger, eventId, message, args);
    }

    /// <summary>Formats and writes a warning log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogWarning(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogWarning(logger, message, args);
    }

    /// <summary>Formats and writes an error log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogError(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogError(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes an error log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogError(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogError(logger, eventId, message, args);
    }

    /// <summary>Formats and writes an error log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogError(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogError(logger, message, args);
    }

    /// <summary>Formats and writes a critical log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="exception">The exception to log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogCritical(this ILogger logger, EventId eventId, Exception exception, string message, params object[] args)
    {
        LoggerExtensions.LogCritical(logger, eventId, exception, message, args);
    }

    /// <summary>Formats and writes a critical log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="eventId">The event id associated with the log.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogCritical(this ILogger logger, EventId eventId, string message, params object[] args)
    {
        LoggerExtensions.LogCritical(logger, eventId, message, args);
    }

    /// <summary>Formats and writes a critical log message.</summary>
    /// <param name="logger">The <see cref="T:Microsoft.Extensions.Logging.ILogger" /> to write to.</param>
    /// <param name="message">Format string of the log message.</param>
    /// <param name="args">An object array that contains zero or more objects to format.</param>
    public static void LogCritical(this ILogger logger, string message, params object[] args)
    {
        LoggerExtensions.LogCritical(logger, message, args);
    }
}

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