在ASP.NET Core 2.2中使用InProcess宿主模型时，Serilog不会将日志写入文件

Question

如果我在ASP.NET Core 2.2中使用新引入的InProcess托管模型，如下所示：

<PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework>
<AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

Serilog不将日志写入文件。但是如果我从CCD_ 5中移除CCD_。

我在Program类中的Serilog配置如下：

public class Program
{
public static void Main(string[] args)
{
Log.Logger = new LoggerConfiguration()
.MinimumLevel.Information() // Set the minimun log level
.WriteTo.File("Logs\log-.txt", rollingInterval: RollingInterval.Day, retainedFileCountLimit: 7) // this is for logging into file system
.CreateLogger();
try
{
Log.Information("Starting web host");
CreateWebHostBuilder(args).Build().Run();
}
catch (Exception ex)
{
Log.Fatal(ex, "Host terminated unexpectedly");
}
finally
{
Log.CloseAndFlush();
}
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.ConfigureLogging(logging => { logging.ClearProviders(); }) // clearing all other logging providers
.UseSerilog(); // Using serilog 
}

专家有什么想法吗！

Answer 1

正如对问题本身的评论中所建议的，当使用InProcess托管模型运行时，应用程序的当前目录与OutOfProcess托管模型不同。对于InProcess，此目录是IIS本身的位置，例如C:Program FilesIIS Express，这意味着您的日志文件正在写入C:Program FilesIIS ExpressLogslog-.txt(假设设置了相关权限(。

这个GitHub问题详细介绍了解决方法，它提供了一个帮助类(CurrentDirectoryHelpers(来设置正确的当前目录。SetCurrentDirectory静态方法使用PInvoke，确定应用程序是否在IIS中运行，如果是，则根据完整的应用程序路径设置当前目录。使用这种方法看起来像这样：

public class Program
{
public static void Main(string[] args)
{
CurrentDirectoryHelpers.SetCurrentDirectory();
Log.Logger = new LoggerConfiguration()
.MinimumLevel.Information() // Set the minimun log level
.WriteTo.File("Logs\log-.txt", rollingInterval: RollingInterval.Day, retainedFileCountLimit: 7) // this is for logging into file system
.CreateLogger();
...
}
}

以下是完整性的CurrentDirectoryHelpers：

using System;
namespace SampleApp
{
internal class CurrentDirectoryHelpers
{
internal const string AspNetCoreModuleDll = "aspnetcorev2_inprocess.dll";
[System.Runtime.InteropServices.DllImport("kernel32.dll")]
private static extern IntPtr GetModuleHandle(string lpModuleName);
[System.Runtime.InteropServices.DllImport(AspNetCoreModuleDll)]
private static extern int http_get_application_properties(ref IISConfigurationData iiConfigData);
[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
private struct IISConfigurationData
{
public IntPtr pNativeApplication;
[System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)]
public string pwzFullApplicationPath;
[System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)]
public string pwzVirtualApplicationPath;
public bool fWindowsAuthEnabled;
public bool fBasicAuthEnabled;
public bool fAnonymousAuthEnable;
}
public static void SetCurrentDirectory()
{
try
{
// Check if physical path was provided by ANCM
var sitePhysicalPath = Environment.GetEnvironmentVariable("ASPNETCORE_IIS_PHYSICAL_PATH");
if (string.IsNullOrEmpty(sitePhysicalPath))
{
// Skip if not running ANCM InProcess
if (GetModuleHandle(AspNetCoreModuleDll) == IntPtr.Zero)
{
return;
}
IISConfigurationData configurationData = default(IISConfigurationData);
if (http_get_application_properties(ref configurationData) != 0)
{
return;
}
sitePhysicalPath = configurationData.pwzFullApplicationPath;
}
Environment.CurrentDirectory = sitePhysicalPath;
}
catch
{
// ignore
}
}
}
}

Answer 2

尝试升级.Net Core版本。这个问题似乎在2.2.3中得到了解决。