Logism 4 ILoggerFacade for Log4Net？

Question

我正在从Prism 2.1转换为Prism 4,我需要为Log4Net编写一个ILoggerFacade类.我从Prism 2.1获取的旧代码不再有效.有没有人有他们愿意分享的ILoggerFacade类的示例代码？谢谢你的帮助.

Answer 1

我想到了.与Prism 2非常相似.首先,创建一个实现ILoggerFacade的自定义记录器类.这是我的班级:

using log4net;
using Microsoft.Practices.Prism.Logging;

namespace FsNoteMaster3
{
    class Log4NetLogger : ILoggerFacade
    {
        #region Fields

        // Member variables
        private readonly ILog m_Logger = LogManager.GetLogger(typeof(Log4NetLogger)); 

        #endregion

        #region ILoggerFacade Members

        /// <summary>
        /// Writes a log message.
        /// </summary>
        /// <param name="message">The message to write.</param>
        /// <param name="category">The message category.</param>
        /// <param name="priority">Not used by Log4Net; pass Priority.None.</param>
        public void Log(string message, Category category, Priority priority)
        {
            switch (category)
            {
                case Category.Debug:
                    m_Logger.Debug(message);
                    break;
                case Category.Warn:
                    m_Logger.Warn(message);
                    break;
                case Category.Exception:
                    m_Logger.Error(message);
                    break;
                case Category.Info:
                    m_Logger.Info(message);
                    break;
            }
        }

        #endregion
    }
}

然后,在Prism 4 Bootstrapper类中,向CreateLogger()返回自定义记录器类的新实例的方法添加覆盖:

protected override Microsoft.Practices.Prism.Logging.ILoggerFacade CreateLogger()
{
    return new Log4NetLogger();
}

请注意,在自定义记录器类中,ILog是Log4Net接口,并且LogManager是Log4Net对象.

从您自己的代码写入自定义记录器(Prism负责自己的日志条目)与Prism 2.1略有不同.您可以直接从IoC容器解析记录器,也可以使用ServiceLocator.将ServiceLocator有被容器无关,这意味着潜在的容器不真正重要的优势.以下是使用ServiceLocator解析记录器的示例:

var logger = (Log4NetLogger)ServiceLocator.Current.GetInstance(typeof(ILoggerFacade));
logger.Log("App.OnStartup() completed", Category.Info ,Priority.None);

该ServiceLocator要求主机项目必须Microsoft.Practices.ServiceLocation.dll参考和匹配using声明.