NLog.Targets.Teams

Simple NLog logging target for Microsoft TEAMS.

The Target uses the TEAMS Incoming webhook.

For more Information about webhooks in Teams read:

• https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/what-are-webhooks-and-connectors
• https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/add-incoming-webhook

The target has a built in layout for the Teams card so you don't have to design it by yourself.

Installation

Simply add the nuget dependency. NLog will do th rest (see: Configuration - NLog).

Configuration

NLog

See: https://github.com/NLog/NLog/wiki/Register-your-custom-component#separate-dll-and-auto-register-non-net-core

MS Teams

Create a incoming Webhook in a Teams channel.
See: https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/add-incoming-webhook

Your Application

Configure the target in your nlog.config. The NLog type of the Target is: MsTeams

Parameters

Parameter	Required	Type	Description
Url	true	string (layout)	Ms Teams incoming webhook URL
ApplicationName	true	string (layout)	the name of your application
Environment	true	string (layout)	the stage your application runs in (e.g. develop, staging, production )
UseLayout			Deprecated
CardImpl	false	string	Fully qualified name of the custom messageCard implementation. If omitted, the internal default implementation will be used.
CardAssembly	false	string	Name of the assembly which holds the CardImpl. Required if you use a cutom messageCard implementation.

Sample Configuration

<target xsi:type="MsTeams" 
            name="whatever"             
            Url="<your TEAMS incoming webhook url>"          
            ApplicationName="<your application name>"
            Environment="<executing environment>" />

Default Teams Message Card

The package provides an interface for implementing Teams message cards (IMessageCard).
If the Parameters CardImpl and CardAssembly ar omitted, the default (built in) IMessageCard implementation will be used. The screenshot shows the built in Teams message card. The color schema of the upper separator line will change according to the log level. The colors are:

Trace	Debug	Info	Warning	Error	Fatal
White	Green	Blue	Yellow	Red	Black

The exception section will only be visible, when an exception is logged.

Custom Teams Message Card

To use your own message card, implement the Interface IMessageCard (provided by the Package) and set the Parameters CardImpl and CardAssembly in the NLog config.
For more information about the Teams message card formatting please read https://docs.microsoft.com/en-us/outlook/actionable-messages/message-card-reference .

Test App

This solution includes a console App for testing.
Bevor you run it, you must add yout Teams webhook Url in the nlog.config inluded in the App (marked with: 'XXX PUT YOUR URL IN HERE XXX').
The demo app also inlcudes a custom IMessageCard implementation (and NLog config), but its very similar to the default implementation. I've only changed the colors.

Changelog

2.0.0

• breaking change: removed parameter UseLayout
• breaking change: NLog Layout parameter will be ignored
• Parameters (Url, ApplicationName, Environment) are now NLog layouts, which enables variable support
• new optional parameters: CardImpl and CardAssembly for easier custom message Card implementation
• added interface IMessageCard for easier custom message Card implementation
• Demo app updated to net5.0
• Demo app updated for easier adaption