以编程方式设置 NLog 目标属性

Question

I am using NLog Azure Storage Logger . My config is as below, I don't want to put the storage key in the target. Instead, I will use it from app settings so that I can set the Azure website "Application Settings" in the deployment environment. How can I programmatically set the connectionString for this target?

 <nlog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform"
   xmlns="http://www.nlog-project.org/schemas/NLog.xsd">

<target type="AzureAppendBlob"
           name="azure"
           layout="${longdate} ${level:uppercase=true} - ${message}"
           connectionString="DefaultEndpointsProtocol=https;AccountName=mylogs;AccountKey=xxxoxxx=="
           container="myappcontainer"
           blobName="${date:format=yyyy-MM-dd}.log" />

Looking for something like,

public class NLogService: IMyLogService
{
   ....

    public NLogService()
    {
        Logger azureLogger = LogManager.GetLogger("AzureAppendBlob");
        AzureAppendBlobTarget t = dbLogger.????;
        t.ConnectionString = "..."; 
    }
}

Answer 1

The recommended way:

var azureBlobTarget = LogManager.Configuration.FindTargetByName<AzureAppendBlobTarget>("azure");
azureBlobTarget.ConnectionString = "DefaultEndpointsProtocol=https;AccountName=mylogs;AccountKey=xxx";

This also works if NLog is configured with a xml file.

Answer 2

Figured out how to do it,

    public NLogService()
    {
        var config = new LoggingConfiguration();
        var azureBlobTarget = new AzureAppendBlobTarget();
        config.AddTarget("azureAppender", azureBlobTarget);

        azureBlobTarget.BlobName = "${date:format=yyyy-MM-dd}.log";  
        azureBlobTarget.ConnectionString = "DefaultEndpointsProtocol=https;AccountName=mylogs;AccountKey=xxx";
        azureBlobTarget.Container = "myapp";
        azureBlobTarget.Layout = @"${longdate} ${level:uppercase=true} - ${message}";            

        var rule1 = new LoggingRule("*", LogLevel.Debug, azureBlobTarget);
        config.LoggingRules.Add(rule1);

        // Step 5. Activate the configuration
        LogManager.Configuration = config;
    }