WebApplication.CreateBuilder ignores Logging:EventLog:SourceName

[KeithHenry]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

WebApplication.CreateBuilder checks for whether it is running on Windows, and if it is then it calls AddEventLog() with settings from Logging:EventLog

If you set Logging:EventLog:LogLevel those settings are honoured.

If you set Logging:EventLog:SourceName in appsettings.json it is ignored, logs write as ".NET Runtime".

I can work around this by manually re-registering the event logger provider:

    [System.Runtime.Versioning.SupportedOSPlatform("windows")]
    public static void SetEventLogConfig(WebApplicationBuilder builder) {
        string? eventLog = builder.Configuration["Logging:EventLog:SourceName"];
        if(eventLog is not null)
            builder.Logging.AddEventLog(c => c.SourceName = eventLog);
    }

// then in program.cs
var builder = WebApplication.CreateBuilder(args);
...
if(RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
    SetEventLogConfig(builder);

Expected Behavior

If you set Logging:EventLog:SourceName it should be used by the logging provider.

Either WebApplication.CreateBuilder should pick up the appsettings.json for AddEventLog(), or it should not call it at all.

Some better documentation on what is supported in this logger would be extremely helpful.

Steps To Reproduce

• Create any basic project with .NET 6 or above's WebApplication.CreateBuilder
• Add a call after app = builder.Build() to app.Logger.LogCritical("test message").
• Add this to appsettings.json:

  "Logging": {
  "EventLog": {
    "LogLevel": {
      "Default": "Warning"
    },
    "SourceName": "testLog"
  }
  }

• Register the new log source on the server with:

  new-eventlog -LogName Application -source testLog

• Run your app
• Check Event Viewer > Application and the "test message" will be under ".NET Runtime", they should be under source "testLog"

Exceptions (if any)

None

.NET Version

7.0.101

Anything else?

Tested with VS 2022 and VSCode on different machines, but mine has:

dotnet --info
.NET SDK:
 Version:   7.0.101
 Commit:    bb24aafa11

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19045
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\7.0.101\

Host:
  Version:      7.0.1
  Architecture: x64
  Commit:       97203d38ba

.NET SDKs installed:
  2.1.700 [C:\Program Files\dotnet\sdk]
  2.1.701 [C:\Program Files\dotnet\sdk]
  2.1.818 [C:\Program Files\dotnet\sdk]
  2.2.401 [C:\Program Files\dotnet\sdk]
  5.0.100 [C:\Program Files\dotnet\sdk]
  6.0.304 [C:\Program Files\dotnet\sdk]
  6.0.307 [C:\Program Files\dotnet\sdk]
  7.0.100 [C:\Program Files\dotnet\sdk]
  7.0.101 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  arm64 [C:\Program Files\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation]
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

[dotnet-issue-labeler[bot]]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[KeithHenry]

@dotnet-issue-labeler I don't, but I'd guess [area-Extensions-Logging]

[ghost]

Tagging subscribers to this area: @dotnet/area-extensions-logging See info in area-owners.md if you want to be subscribed.

Issue Details

---

### Is there an existing issue for this? - [X] I have searched the existing issues ### Describe the bug `WebApplication.CreateBuilder` checks for whether it is running on Windows, and if it is then it calls `AddEventLog()` with settings from `Logging:EventLog` If you set `Logging:EventLog:LogLevel` those settings are honoured. If you set `Logging:EventLog:SourceName` in `appsettings.json` it is ignored, logs write as `".NET Runtime"`. I can work around this by manually re-registering the event logger provider: ```c# [System.Runtime.Versioning.SupportedOSPlatform("windows")] public static void SetEventLogConfig(WebApplicationBuilder builder) { string? eventLog = builder.Configuration["Logging:EventLog:SourceName"]; if(eventLog is not null) builder.Logging.AddEventLog(c => c.SourceName = eventLog); } // then in program.cs var builder = WebApplication.CreateBuilder(args); ... if(RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) SetEventLogConfig(builder); ``` ### Expected Behavior If you set `Logging:EventLog:SourceName` it should be used by the logging provider. Either `WebApplication.CreateBuilder` should pick up the `appsettings.json` for `AddEventLog()`, or it should not call it at all. Some better documentation on what is supported in this logger would be extremely helpful. ### Steps To Reproduce - Create any basic project with .NET 6 or above's `WebApplication.CreateBuilder` - Add a call after `app = builder.Build()` to `app.Logger.LogCritical("test message")`. - Add this to `appsettings.json`: ```json "Logging": { "EventLog": { "LogLevel": { "Default": "Warning" }, "SourceName": "testLog" } } ``` - Register the new log source on the server with: ```powershell new-eventlog -LogName Application -source testLog ``` - Run your app - Check Event Viewer > Application and the _"test message"_ will be under `".NET Runtime"`, they should be under source `"testLog"` ### Exceptions (if any) None ### .NET Version 7.0.101 ### Anything else? Tested with VS 2022 and VSCode on different machines, but mine has: ``` dotnet --info .NET SDK: Version: 7.0.101 Commit: bb24aafa11 Runtime Environment: OS Name: Windows OS Version: 10.0.19045 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\7.0.101\ Host: Version: 7.0.1 Architecture: x64 Commit: 97203d38ba .NET SDKs installed: 2.1.700 [C:\Program Files\dotnet\sdk] 2.1.701 [C:\Program Files\dotnet\sdk] 2.1.818 [C:\Program Files\dotnet\sdk] 2.2.401 [C:\Program Files\dotnet\sdk] 5.0.100 [C:\Program Files\dotnet\sdk] 6.0.304 [C:\Program Files\dotnet\sdk] 6.0.307 [C:\Program Files\dotnet\sdk] 7.0.100 [C:\Program Files\dotnet\sdk] 7.0.101 [C:\Program Files\dotnet\sdk] .NET runtimes installed: Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 7.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Other architectures found: arm64 [C:\Program Files\dotnet] registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation] x86 [C:\Program Files (x86)\dotnet] registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation] ```

Author:	KeithHenry
Assignees:	-
Labels:	`untriaged`, `area-Extensions-Logging`
Milestone:	-

[KeithHenry]

What's happening on this? It's been 6 months.

[tramhuynhtd]

Hi, Is there any update on this?