Merge pull request #18 from followynne/hotfix/mongodb-client-registration

Use TryAddSigleton to prevent service override in clients.

Author: mo-esmp

src/Serilog.Ui.MongoDbProvider/Extensions/SerilogUiOptionBuilderExtensions.cs

@@ -1,4 +1,5 @@
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
 using MongoDB.Driver;
 using Serilog.Ui.Core;
 using System;
@@ -38,7 +39,7 @@ string collectionName
             };
 
             ((ISerilogUiOptionsBuilder)optionsBuilder).Services.AddSingleton(mongoProvider);
-            ((ISerilogUiOptionsBuilder)optionsBuilder).Services.AddSingleton<IMongoClient>(o => new MongoClient(connectionString));
+            ((ISerilogUiOptionsBuilder)optionsBuilder).Services.TryAddSingleton<IMongoClient>(o => new MongoClient(connectionString));
             ((ISerilogUiOptionsBuilder)optionsBuilder).Services.AddScoped<IDataProvider, MongoDbDataProvider>();
         }