Impossible to set up connection string programmatically.

[DenKn]

My config file

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Warn">
  <variable name="azureBlobConnString" value="" />

  <targets>

    <target name="azureLogs"
            xsi:type="AzureBlobStorage"
            layout="${layoutFormat}"
            blobName="myBlob"
            connectionString="${var:azureBlobConnString}"
            container="logs" />
 </targets>

My code
LogManager.Configuration.Variables["azureBlobConnString"] = "DefaultEndpointsProtocol=https;AccountName=*****;AccountKey=*****==;EndpointSuffix=core.windows.net";

But I get 'Connection string required' exception.

[snakefoot]

You need to setup the NLog variable before loading the NLog-config (ex creating NLog-Logger object).

Alternative you can do this:

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Warn">
  <variable name="azureBlobDevConnString" value="UseDevelopmentStorage=true;" />
  <targets>

    <target name="azureLogs"
            xsi:type="AzureBlobStorage"
            layout="${layoutFormat}"
            blobName="myBlob"
            connectionString="${gdc:azureBlobConnString:whenEmpty=${var:azureBlobDevConnString}}"
            container="logs" />
  </targets>
</nlog>

And then do this:

NLog.GlobalDiagnosticsContext.Set("azureBlobConnString", "DefaultEndpointsProtocol=https;AccountName=*****;AccountKey=*****==;EndpointSuffix=core.windows.net");
LogManager.Configuration = LogManager.Configuration.Reload();  // Re-initialize blob-target

See also: https://github.com/NLog/NLog/wiki/Reinitialize-NLog-configuration and #48

[DenKn]

Yes. That works.