public event NotifyCollectionChangedEventHandler LogEntriesChanged (#355)

src/WireMock.Net/Server/FluentMockServer.LogEntries.cs

@@ -19,7 +19,21 @@ namespace WireMock.Server
         [PublicAPI]
         public event NotifyCollectionChangedEventHandler LogEntriesChanged
         {
-            add => _options.LogEntries.CollectionChanged += value;
+            add
+            {
+                _options.LogEntries.CollectionChanged += (sender, eventRecordArgs) =>
+                {
+                    try
+                    {
+                        value(sender, eventRecordArgs);
+                    }
+                    catch (Exception exception)
+                    {
+                        _options.Logger.Error("Error calling the LogEntriesChanged event handler: {0}", exception.Message);
+                    }
+                };
+            }
+
             remove => _options.LogEntries.CollectionChanged -= value;
         }
 

test/WireMock.Net.Tests/ObservableLogEntriesTest.cs

@@ -5,16 +5,48 @@ using System.Net;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Moq;
 using NFluent;
+using WireMock.Logging;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
+using WireMock.Settings;
 using Xunit;
 
 namespace WireMock.Net.Tests
 {
     public class ObservableLogEntriesTest
     {
+        [Fact]
+        public async void FluentMockServer_LogEntriesChanged_WithException_Should_LogError()
+        {
+            // Assign
+            string path = $"/log_{Guid.NewGuid()}";
+            var loggerMock = new Mock<IWireMockLogger>();
+            loggerMock.Setup(l => l.Error(It.IsAny<string>(), It.IsAny<object[]>()));
+            var settings = new FluentMockServerSettings
+            {
+                Logger = loggerMock.Object
+            };
+            var server = FluentMockServer.Start(settings);
+            
+            server
+                .Given(Request.Create()
+                    .WithPath(path)
+                    .UsingGet())
+                .RespondWith(Response.Create()
+                    .WithBody(@"{ msg: ""Hello world!""}"));
+
+            server.LogEntriesChanged += (sender, args) => throw new Exception();
+
+            // Act
+            await new HttpClient().GetAsync($"http://localhost:{server.Ports[0]}{path}");
+
+            // Assert
+            loggerMock.Verify(l => l.Error(It.IsAny<string>(), It.IsAny<object[]>()), Times.Once);
+        }
+
         [Fact]
         public async void FluentMockServer_LogEntriesChanged()
         {