fixed stringify support in logger scope

Author: bicj-leica

src/Serilog.Extensions.Logging/Extensions/Logging/SerilogLoggerScope.cs

@@ -71,6 +71,7 @@ public void EnrichAndCreateScopeItem(LogEvent logEvent, ILogEventPropertyFactory
 
                     var key = stateProperty.Key;
                     var destructureObject = false;
+                    var value = stateProperty.Value;
 
                     if (key.StartsWith("@"))
                     {
@@ -81,9 +82,10 @@ public void EnrichAndCreateScopeItem(LogEvent logEvent, ILogEventPropertyFactory
                     if (key.StartsWith("$"))
                     {
                         key = key.Substring(1);
+                        value = value?.ToString();
                     }
 
-                    var property = propertyFactory.CreateProperty(key, stateProperty.Value, destructureObject);
+                    var property = propertyFactory.CreateProperty(key, value, destructureObject);
                     logEvent.AddPropertyIfAbsent(property);
                 }
             }

test/Serilog.Extensions.Logging.Tests/SerilogLoggerTests.cs

@@ -162,6 +162,21 @@ public void SingleScopeProperty()
             Assert.Equal("\"pizza\"", sink.Writes[0].Properties["Name"].ToString());
         }
 
+        [Fact]
+        public void StringifyScopeProperty()
+        {
+            var (logger, sink) = SetUp(LogLevel.Trace);
+
+            using (logger.BeginScope("{$values}", new int[] { 1, 2, 3, 4 }))
+            {
+                logger.Log(LogLevel.Information, 0, TestMessage, null, null);
+            }
+
+            Assert.Equal(1, sink.Writes.Count);
+            Assert.True(sink.Writes[0].Properties.ContainsKey("values"));
+            Assert.Equal("\"System.Int32[]\"", sink.Writes[0].Properties["values"].ToString());
+        }
+
         [Fact]
         public void NestedScopeSameProperty()
         {