Question

如何为生成的电子邮件主题指定布局和conversionPattern？

BufferSize需要小于或等于1，因此不会发生缓冲。

Answer 1

CodeProject文章log4net NonBufferedSmtpAppenderWithSubjectLayout看起来很有希望。

通过继承所需的基本appender（在我的情况下为SmtpPickupDirAppender）并添加ILayout属性，可以在Append方法中更改Subject。

public class SmtpSubjectLayoutPickupDirAppender : log4net.Appender.SmtpPickupDirAppender
{
    public SmtpSubjectLayoutPickupDirAppender()
        : base()
    {

    }

    public ILayout SubjectLayout
    {
        get;
        set;
    }

    protected override void Append(log4net.Core.LoggingEvent loggingEvent)
    {
        if (this.BufferSize <= 1 && this.SubjectLayout != null)
        {
            StringWriter subjectWriter = new StringWriter(System.Globalization.CultureInfo.InvariantCulture);
            this.SubjectLayout.Format(subjectWriter, loggingEvent);
            this.Subject = subjectWriter.ToString();
        }

        base.Append(loggingEvent);
    }
}

然后可以通过指定subjectLayout属性来覆盖默认主题。

<appender name="SmtpPickupDirAppender" type="namespace.for.SmtpSubjectLayoutPickupDirAppender">
    <to value="to@domain.com" />
    <from value="from@domain.com" />
    <subject value="test logging message" />

    <subjectLayout type="log4net.Layout.PatternLayout, log4net">
        <conversionPattern value="Logging message - %message"/>
    </subjectLayout>

    <pickupDir value="C:\SmtpPickup" />
    <bufferSize value="1" />
    <lossy value="true" />
    <evaluator type="log4net.Core.LevelEvaluator">
        <threshold value="WARN"/>
    </evaluator>
    <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline%newline%newline" />
    </layout>
</appender>

Answer 2

Here is另一个带自定义主题的SmtpAppender示例。

Answer 3

您可以从Nuget

下载

Source code and example

Answer 4

因为之前的回答建议使用NuGet版本的SmtpAppenderWithSubjectLayout需要log4net版本＆gt; 1.2.1，我使用了NuGet源代码，但修改后使用了log4net 1.2.1

public class SmtpAppenderWithSubjectLayout : SmtpAppender
    {
        public PatternLayout SubjectLayout { get; set; }

        protected override void SendBuffer(LoggingEvent[] events)
        {
            PrepareSubject(events);

            base.SendBuffer(events);
        }

        protected virtual void PrepareSubject(IEnumerable<LoggingEvent> events)
        {
            var subjects = new List<string>();

            foreach (LoggingEvent @event in events)
            {
                if (Evaluator.IsTriggeringEvent(@event))
                {
                    var subjectWriter = new StringWriter(System.Globalization.CultureInfo.InvariantCulture);
                    SubjectLayout.Format(subjectWriter, @event);
                    subjects.Add(subjectWriter.ToString());
                }
            }

            Subject = string.Join(", ", subjects.ToArray());
        }
    }

使用自定义主题配置或扩展log4net SmtpAppender

4 个答案: