1.MongoDB Driver Exception in Preview 4
I installed .NET Core Preview 4, startup my app, and received this exception. This is a .NET Core Console Application that is referencing an object in a .NET Standard Library. The types all appear appear in the debugger however the mongo driver throws this exception.
I moved back to .NET Core Preview 3, recompiled, and there is no issue.
System.TypeInitializationException
HResult=0x80131534
Message=The type initializer for 'MongoDB.Bson.Serialization.BsonClassMap' threw an exception.
Source=MongoDB.Bson
StackTrace:
at MongoDB.Bson.Serialization.BsonClassMap.LookupClassMap(Type classType)
at MongoDB.Bson.Serialization.BsonClassMapSerializationProvider.GetSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
at MongoDB.Bson.Serialization.BsonSerializerRegistry.CreateSerializer(Type type)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at MongoDB.Bson.Serialization.BsonSerializerRegistry.GetSerializer[T]()
at MongoDB.Driver.MongoCollectionImpl`1..ctor(IMongoDatabase database, CollectionNamespace collectionNamespace, MongoCollectionSettings settings, ICluster cluster, IOperationExecutor operationExecutor)
at MongoDB.Driver.MongoDatabaseImpl.GetCollection[TDocument](String name, MongoCollectionSettings settings)
...
Inner Exception 1:
ArgumentNullException: Value cannot be null.
Parameter name: typehttps://github.com/dotnet/core/issues/2611
2.MongoDB driver needs a reference to System.Runtime.Serialization.Formatters.
3.Fix initialization on .NET Core 3.0 preview 4
3.1 src/MongoDB.Bson/MongoDB.Bson.csproj
<PackageReference Include="System.Diagnostics.Process" Version="4.1.0" />
<PackageReference Include="System.Dynamic.Runtime" Version="4.0.11" />
<PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.3.0" />
+ <PackageReference Include="System.Runtime.Serialization.Formatters" Version="4.3.0" />
</ItemGroup>
3.2 src/MongoDB.Bson/Serialization/BsonClassMap.cs
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;
-#if NET452
using System.Runtime.Serialization;
-#endif
using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization.Conventions;
src/MongoDB.Bson/Serialization/BsonClassMap.cs
@@ -38,10 +38,7 @@ public class BsonClassMap
private readonly static Queue<Type> __knownTypesQueue = new Queue<Type>();
private static readonly MethodInfo __getUninitializedObjectMethodInfo =
- typeof(string)
- .GetTypeInfo()
- .Assembly
- .GetType("System.Runtime.Serialization.FormatterServices")
+ GetFormatterServicesType()
.GetTypeInfo()
?.GetMethod("GetUninitializedObject", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
@@ -1306,7 +1303,21 @@ private void ThrowNotFrozenException()
var message = string.Format("Class map for {0} has been not been frozen yet.", _classType.FullName);
throw new InvalidOperationException(message);
}
}
private static Type GetFormatterServicesType()
{
#if NET452
return typeof(string)
.GetTypeInfo()
.Assembly
.GetType("System.Runtime.Serialization.FormatterServices");
#else
return
Assembly.Load(new AssemblyName("System.Runtime.Serialization.Formatters"))
.GetType("System.Runtime.Serialization.FormatterServices");
#endif
}
}