自定义DataContractResolver ResolveName DataContractResolver参数不应为null

Question

我正在使用自定义DataContractResolver

 public override Type ResolveName(string typeName, string typeNamespace, Type declaredType, DataContractResolver knownTypeResolver)
        {
            Type knownType = knownTypeResolver.ResolveName(typeName, typeNamespace, declaredType, null);

            if (knownType != null)
            {
                return knownType;
            }...

同样的情况是使用TryResolve方法（我不需要）

public override bool TryResolveType(Type type, Type declaredType, DataContractResolver knownTypeResolver, out XmlDictionaryString typeName, out XmlDictionaryString typeNamespace)
        {
           return knownTypeResolver.TryResolveType(type, declaredType, null, out typeName, out typeNamespace);

Resharper告诉我，最后一个参数不应为null，因为它标有[NotNull]属性。

ResolveName方法也被System.Runtime.Serialization.KnownTypeDataContractResolver类覆盖。

这是实施：

public override Type ResolveName(string typeName, string typeNamespace, Type declaredType, DataContractResolver knownTypeResolver)
    {
      if (typeName == null || typeNamespace == null)
        return (Type) null;
      else
        return this.context.ResolveNameFromKnownTypes(new XmlQualifiedName(typeName, typeNamespace));
    }

甚至没有使用参数knownTypeResolver！

我看到的所有例子都像我一样使用它。 什么是正确的实施？