EventGridTarget - Added DataFormat-option instead checking JsonLayout (#149)

Author: snakefoot

src/NLog.Extensions.AzureEventGrid/EventGridTarget.cs

@@ -45,7 +45,29 @@ public class EventGridTarget : AsyncTaskTarget
         /// <summary>
         /// Content type of the payload. A content type different from "application/json" should be specified if payload is not JSON.
         /// </summary>
-        public Layout ContentType { get; set; }
+        public Layout ContentType
+        {
+            get => _contentType;
+            set
+            {
+                _contentType = value;
+                if (!_dataFormatJson.HasValue && value?.ToString()?.IndexOf("json", StringComparison.OrdinalIgnoreCase) >= 0)
+                {
+                    _dataFormatJson = true;
+                }
+            }
+        }
+        private Layout _contentType;
+
+        /// <summary>
+        /// The serialize format of the data object. Json / Binary
+        /// </summary>
+        public string DataFormat
+        {
+            get => _dataFormatJson == true ? "Json" : "Binary";
+            set => _dataFormatJson = value?.IndexOf("Json", StringComparison.OrdinalIgnoreCase) >= 0;
+        }
+        private bool? _dataFormatJson;
 
         /// <summary>
         /// The schema version of the data object.
@@ -207,7 +229,7 @@ private CloudEvent CreateCloudEvent(LogEventInfo logEvent)
             var eventType = RenderLogEvent(EventType, logEvent) ?? string.Empty;
             var eventDataSchema = RenderLogEvent(DataSchema, logEvent) ?? string.Empty;
             var eventContentType = RenderLogEvent(ContentType, logEvent) ?? string.Empty;
-            var cloudEventFormat = Layout is JsonLayout ? CloudEventDataFormat.Json : CloudEventDataFormat.Binary;
+            var cloudEventFormat = _dataFormatJson == true ? CloudEventDataFormat.Json : CloudEventDataFormat.Binary;
             var cloudEvent =  new CloudEvent(eventSource, eventType, new BinaryData(EncodeToUTF8(eventDataBody)), eventContentType, cloudEventFormat);
             cloudEvent.Time = logEvent.TimeStamp.ToUniversalTime();
 

src/NLog.Extensions.AzureEventGrid/README.md

@@ -44,6 +44,8 @@ _eventType_ - Type of the event. Ex. "Contoso.Items.ItemReceived". [Layout](http
 
 _contentType_ - Content type of the data-payload. [Layout](https://github.com/NLog/NLog/wiki/Layouts)
 
+_dataFormat_ - Format of the data-payload (Binary / Json). Default Binary. `String`
+
 _dataSchema_ - Schema version of the data-payload. [Layout](https://github.com/NLog/NLog/wiki/Layouts)
 
 _tenantIdentity_ - Input for DefaultAzureCredential. [Layout](https://github.com/NLog/NLog/wiki/Layouts)