[shouldbworking]

Since Java is the most similar language and what I'm familiar with, here's some things where no C# equivalent exists:

Lucene, Guava, Apache Commons, Redis driver, Postgres driver, Cassandra driver, Kafka driver, gRPC, Http2 support(on all platforms, not just windows 10)

Notice I said "equivalent". C# ports exist for some of these but they're unofficial, unmaintained, or both. The most heinous thing I've seen MS do recently is only support Http2 on newer versions of Windows. Http2 is a high level protocol and there's absolutely no reason for this. In Java you can use Http2 on any platform using Jetty, Netty, or soon built into Java 9.

[voltagex_]

I think you're being a bit unfair.

I am not properly familiar with Guava, but aren't most things available in .NET's collections classes?

A lot of what's in Commons is available in the .NET BCL.

https://redis.io/clients#c looks fine to me (I'd probably pick the StackExchange client)

NPgSQL seems to be the recommended library for Postgres.

https://www.nuget.org/packages/CassandraCSharpDriver/ was updated in February.

https://github.com/Microsoft/CSharpClient-for-Kafka starts to show some of the issues you're talking about - Microsoft aren't supporting this one anymore, but they point to https://github.com/confluentinc/confluent-kafka-dotnet which wraps librdkafka - seems sensible

I'll definitely give you a point for the HTTP2/IIS issue - although there might be more technical reasons than you think for that. From what I recall, a lot of NET and Windows HTTP stuff is implemented in http.sys or WinHTTP which is a low level component. They're not going to ship a large update to anything before Win10, so that's probably why it's missing. In this case I'd just run nginx in front of IIS if you needed to, but I'd hope that most people running IIS in production can afford to update to Windows Server 2012 or 2016.

[shouldbworking]

Guava/Commons contains a lot more than collections. The standard class library in .NET has maybe a third of what's in Guava. Keep in mind that Java's built in library is probably just as big as C#. I won't bore everyone going over the list but check out the summary https://github.com/google/guava/wiki

Things I've used recently include Guavas automatic argument tester, in memory caches/queues, high speed hashing algorithms, and Bloom filter. None of that stuff has real equivalents in C#.

That redis client looks solid, so I may got a bit carried trying to prove a point. The Postgres driver looks good too, but is not officially maintain by the PG team so it could evaporate some day. The Java equivalent IS an official Postgres driver. I see this with C# frequently, it's treated as second class by a lot of OSS projects.

You didn't make a counterpoint to Lucene, I assume because there was really no equal out there for C#.

These days tying your language to Windows, visual studio, and IIS is unforgivable. MS is trying to undo this with .NET core but for the time being I find it rediculous to need to pay for all these licenses. If my employer wasn't paying for my enterprise edition of VS and copies of IIS, Windows Server, and SQL Server I wouldn't be touching C# at all.

At home I use OpenJDK with eclipse and Dropwizard running on Linux with Postgres. The quality of the tech is the same and everything is free and open source.

[maxxxxx]

That's the thing. With .NET and windows you are second class citizen for a lot of open source stuff. A lot of the latest and best stuff is done on Linux and often on Java.