客户端类中中记录异常的方法： 使用Log4net

1、首先引用Log4Net 的命名空间

    using log4net;

2、在使用的类中生命静态变量 log

      public class FileService
    {
        static readonly ILog log = LogManager.GetLogger(typeof(FileService));

         .....

         .....

   3、在 try catch 语句中记录异常信息

    

try
			{
				operationHandler(fileName);
				return FileOperationResult.Successful;
			}
			catch (IOException ex)
			{
				log.Info("Unable to save file: " + fileName, ex);
				userMessage = "A problem occured saving the file."; /* TODO: Make localizable resource. */
				ioExceptionOccured = true;
			}
			catch (Exception ex) /* TODO: catch common IO errors and report to user. */
			{
				log.Info("Unable to save file: " + fileName, ex);
				var userMessageException = ex as IUserMessageProvider;
				if (userMessageException != null && userMessageException.UserMessagePresent)
				{
					userMessage = userMessageException.UserMessage;
				}
			}