log4net：保存自定义参数到数据库

1. log4net:保存日志到数据库
2. 自定义参数
   1. 新建一个类，继承于PatternLayoutConverter

      public class CustomerPatternConverter : PatternLayoutConverter
          {
              protected override void Convert(System.IO.TextWriter writer, log4net.Core.LoggingEvent loggingEvent)
              {
                  if (Option != null)
                  {
                      // Write the value for the specified key
                      WriteObject(writer, loggingEvent.Repository, LookupProperty(Option, loggingEvent));
                  }
                  else
                  {
                      // Write all the key value pairs
                      WriteDictionary(writer, loggingEvent.Repository, loggingEvent.GetProperties());
                  }
              }
      
              /// <summary>
              /// 通过反射获取传入的日志对象的某个属性的值
              /// </summary>
              /// <param name="property"></param>
              /// <returns></returns>
              private object LookupProperty(string property, log4net.Core.LoggingEvent loggingEvent)
              {
                  object propertyValue = string.Empty;
      
                  PropertyInfo propertyInfo = loggingEvent.MessageObject.GetType().GetProperty(property);
                  if (propertyInfo != null)
                      propertyValue = propertyInfo.GetValue(loggingEvent.MessageObject, null);
      
                  return propertyValue;
              }
          }
      

   2. 创建自定义Layout

      public class MyLayout:log4net.Layout.PatternLayout
      {
          public MyLayout()
          {
              this.AddConverter("Customer",typeof(CustomerPatternConverter));
          }
      }

   3. 创建一个类，用来保存需要保存到数据库中的数据

      public class LogContent
      {
      
          public string CustomerCol { get; set; }
      
          public string Test { get; set; }
      }

   4. 修改数据库的表结构

      alter table dbo.[log] add customerCol nvarchar(max)
      alter table dbo.[log] add Test nvarchar(max)

   5. 修改配置文档，在文档中添加如下parameter

      <parameter>
              <parameterName value="@customerCol"/>
              <dbtype value="String"/>
              <size value="4000"/>
              <Layout type="Tospur.Test.Log4net.MyLayout">
                <param name="ConversionPattern" value="%Customer{CustomerCol}"></param>
              </Layout>
            </parameter>
            <parameter>
              <parameterName value="@Test"/>
              <dbtype value="String"/>
              <size value="4000"/>
              <Layout type="Tospur.Test.Log4net.MyLayout">
                <param name="ConversionPattern" value="%Customer{Test}"></param>
              </Layout>
            </parameter>

   6. 修改配置文件中的sql语

      <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[customerCol],[Test]) 
      VALUES (@log_date, @thread, @log_level, @logger, @message,@customerCol,@Test)" />

   7. 运行代码

      static void Main(string[] args)
      {
          log4net.ILog log = log4net.LogManager.GetLogger("logdb");
          log.Info(new LogContent { CustomerCol="1234", Test="TEst" });
          Console.ReadKey();
      }

3. 运行程序，查看结果

http://www.cnblogs.com/MQNH/articles/5603326.html