c# - How to set app settings value programmatically in Blazor server-side - Stack Overflow

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I need to pass UserId as part of Serilog logging. For this I created a new variable UserId with empty value in app settings, and set the value programmatically in index.razor.

This code shown here is not working. How do I set the value for userId in appsettings.json?

Appsettings.json:

"Serilog": {
   "Using": [],
   "MinimumLevel": {
     "Default": "Information",
     "Override": {
       "Microsoft": "Warning",
       "System": "Warning"
     }
   },
   "WriteTo": [
     {
       "Name": "Seq",
       "Args": { "serverUrl": "; }
     }
   ],   
   "Properties": {
     "ApplicationName": "TESTApp",
     "Environment": "DEV"
     "UserId": ""
   }
}

index.razor:

protected override async Task OnInitializedAsync()
{     
     UserName = GetUserId();
     Configuration["Serilog:Properties:UserId"] = UserName;     
}

I need to pass UserId as part of Serilog logging. For this I created a new variable UserId with empty value in app settings, and set the value programmatically in index.razor.

This code shown here is not working. How do I set the value for userId in appsettings.json?

Appsettings.json:

"Serilog": {
   "Using": [],
   "MinimumLevel": {
     "Default": "Information",
     "Override": {
       "Microsoft": "Warning",
       "System": "Warning"
     }
   },
   "WriteTo": [
     {
       "Name": "Seq",
       "Args": { "serverUrl": "https://logging.mysite" }
     }
   ],   
   "Properties": {
     "ApplicationName": "TESTApp",
     "Environment": "DEV"
     "UserId": ""
   }
}

index.razor:

protected override async Task OnInitializedAsync()
{     
     UserName = GetUserId();
     Configuration["Serilog:Properties:UserId"] = UserName;     
}

• c#
• json
• asp-core
• -core
• blazor-server-side

Share Improve this question Follow edited Nov 21, 2024 at 4:48 marc_s 757k184184 gold badges1.4k1.4k silver badges1.5k1.5k bronze badges asked Nov 21, 2024 at 0:17 HenryHenry 88366 gold badges2525 silver badges5353 bronze badges 1

• Don't try to change the configuration, inject any extra context like stackoverflow/questions/51261177/add-username-into-serilog – Jeremy Lakeman Commented Nov 21, 2024 at 2:18

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1 Answer 1

Sorted by: Reset to default 1

I think you want changing the json file. You could try use "JsonObject" for easily modify the json text.

@using System.Text.Json
@using System.Text.Json.Nodes

        var filePath = "appsettings.json";
        var oldjson = File.ReadAllText(filePath);
        var jsonobject = JsonObject.Parse(oldjson);
        jsonobject["Serilog"]["Properties"]["UserId"] = UserName;
        var newjson = jsonobject.ToString();
        File.WriteAllText(filePath, newjson);

After the file has changed , builder.Configuration will change automatically. Or you could make sure the configuration is reloaded when file change.

builder.Configuration.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

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