Question

因此，根据MS documentation，我们可以将EvventLog添加为日志记录提供程序之一。但是当我在我的.NET Core 2 Web Api应用程序中添加Microsoft.Extensions.Logging.EventLog包时，我看到如下的黄色解释标记

有了这样的警告，我仍然能够在BuildWebHost方法中添加EventLog

public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseApplicationInsights()
                .UseUrls("http://*:40006")                
            .ConfigureLogging((hostingContext,logging)=> 
            {
                logging.AddEventLog(new Microsoft.Extensions.Logging.EventLog.EventLogSettings()
                {                    
                    SourceName = "MySource",
                });
            })
            .Build();

然而，当我运行应用程序时，我收到错误

无法加载类型＆＃39; System.Diagnostics.EventLog＆＃39;从装配＆＃39;系统，版本= 4.0.0.0，文化=中立，公钥= b77a5c561934e089＆＃39;＆＃39;

和警告

严重级代码描述项目文件行抑制状态警告NU1701软件包＆＃39; Microsoft.Extensions.Logging.EventLog 2.0.0＆＃39; 使用＆＃39; .NETFramework，Version = v4.6.1＆＃39;进行了恢复。而不是项目目标框架＆＃39; .NETCoreApp，Version = v2.0＆＃39;。这个包可能与您的项目不完全兼容。

Answer 1

我在.NET Core 2.x中取得了一些成功：

using System;
using System.Runtime.InteropServices;

namespace Foo
{
    public enum EventLogType
    {
        EVENTLOG_SUCCESS = 0x000,
        EVENTLOG_AUDIT_FAILURE = 0x0010,
        EVENTLOG_AUDIT_SUCCESS = 0x0008,
        EVENTLOG_ERROR = 0x0001,
        EVENTLOG_INFORMATION = 0x0004,
        EVENTLOG_WARNING = 0x0002
    }

    public static class EventLog
    {
        [DllImport("advapi32.dll", EntryPoint = "RegisterEventSource", SetLastError = true)]
        public static extern long RegisterEventSource(string lpUNCServerName, string lpSourceName);

        [DllImport("advapi32.dll", EntryPoint = "DeregisterEventSource", SetLastError = true)]
        public static extern int DeregisterEventSource(IntPtr hHandle);

        [DllImport("advapi32.dll", SetLastError = true)]
        static extern int ReportEvent(IntPtr hHandle, ushort wType, ushort wCategory, uint dwEventID, IntPtr uSid, ushort wStrings, uint dwDataSize, string[] lpStrings, byte bData);

        public static void Write(string source, string message, EventLogType type)
        {
            int lastError = -1;
            IntPtr handle = IntPtr.Zero;
            string[] strs = new string[2];

            long rawHandle64 = RegisterEventSource(null, source);
            handle = new IntPtr(rawHandle64);

            lastError = Marshal.GetLastWin32Error();

            if (lastError == 0)
            {
                strs[0] = source;
                strs[1] = message;

                int res = ReportEvent(handle, (ushort)type, 0, 0, IntPtr.Zero, 2, 0, strs, 0);

                lastError = Marshal.GetLastWin32Error();

                DeregisterEventSource(handle);

                lastError = Marshal.GetLastWin32Error();
            }
        }
    }
}

Answer 2

如果使用2.0，则需要按照ASP.NET Core and Windows Event Log中的说明添加对软件包Microsoft.Windows.Compatibility的引用。

无法使用.NET Core 2应用程序添加Microsoft.Extensions.Logging.EventLog包

2 个答案: