Question

我浏览了所有相关主题，但我没有找到答案。我正在运行WMI查询以检索应用程序日志中最早事件的日期时间。不幸的是，下面的查询总是返回0值，但显然语法是正确的，因为没有返回错误消息。知道为什么会这样吗？实际上c＃嵌入式解决方案下载整个Eventviewer，因为我连接到远程机器，性能很糟糕。因此我选择了WMI查询

SelectQuery query = new SelectQuery("select * from Win32_NtLogEvent where Logfile ='" + logFileName + "' and RecordNumber = '1'");

using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query, opt)) {
    foreach (ManagementObject mo in searcher.Get()) {
         DateTime firstEventTime;
         DateTime.TryParseExact(mo["TimeGenerated"].ToString().Substring(0, 12), "yyyyMMddHHmm", null, DateTimeStyles.None, out firstEventTime);
         // if the time of the first entry of the application log is older that the dayback to check date
         // set dayback to check to first app log entry date
         logbox.writetoLogFile(this.GetType().Name, "First event time is " + firstEventTime, LogLevel.Debug);
             if (firstEventTime > endDate) {
                 endDate = firstEventTime;
                 logbox.writetoLogTextbox("First eventviewer entry has date " + firstEventTime + ". Check log will stop at this date", Color.Black);
                 logbox.writetoLogFile(this.GetType().Name, "First eventviewer entry has date " + firstEventTime + ". Check log will stop at this date", LogLevel.Info);
             }
     }
}

不幸的是我现在想出来了。记录号未被重置，因此事件1自年龄以来已消失。 :(知道如何收集这些信息吗？

谢谢，马可

Answer 1

RecordNumber是唯一标识符，并且不一定与您使用的LogFile匹配，类似于主键，并且您为每台计算机获取不同的数字msdn RecordNumber的定义}：

标识Windows NT事件日志文件中的事件。这是特定于日志文件并与日志文件名一起使用唯一地标识该类的实例。

所以你应该做的是获取具有特定LogFile的所有事件，按TimeGenerated排序并获取旧事件并再次搜索旧事件的编号：即：

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Management;

namespace WmiEventQuery
{
    class Program
    {
        static void Main(string[] args)
        {
            SelectQuery query = new SelectQuery("select * from Win32_NtLogEvent where LogFile = 'Application' ");
            //execute the query using WMI
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
            //loop through each log found
            List<EventDateTime> datetimesEvents = new List<EventDateTime>();
            foreach (ManagementObject mo in searcher.Get())
            {
                DateTime firstEventTime;
                DateTime.TryParseExact(mo["TimeGenerated"].ToString().Substring(0, 12), "yyyyMMddHHmm", null, DateTimeStyles.None, out firstEventTime);

                datetimesEvents.Add(new EventDateTime
                {
                    RecordNumber = Convert.ToInt32(mo["RecordNumber"]),
                    TimeGenerated = firstEventTime
                });
            }

            int olderRecordNumber = datetimesEvents.OrderBy(p => p.RecordNumber).FirstOrDefault().RecordNumber;

            SelectQuery queryUnique = new SelectQuery(
                System.String.Format("select * from Win32_NtLogEvent where RecordNumber = {0}", olderRecordNumber)
                );

            ManagementObjectSearcher searcherUnique = new ManagementObjectSearcher(queryUnique);

            foreach (ManagementObject mo in searcherUnique.Get())
            {
                //get the older event
                Console.WriteLine(mo["Message"]);
                Console.WriteLine(mo["RecordNumber"]);
            }

            Console.Read();

        }
    }

    public class EventDateTime
    {
        public DateTime TimeGenerated { get; set; }
        public int RecordNumber { get; set; }
    }

}

WMI查询 - 查找最早的应用程序日志事件

1 个答案: