Hello,

After switching to latest version (4.2), I'm not able to build anymore:

I've some remarks on the latest release of DO.Net 4.2 :

• AddUpgradeHint not up to date in manual

Signature has changed : manual needs to be updated accordingly

• Key.ToTypedKey<t> is gone How can I get an entity from its Key instance?

Scenario : I'm using Key.Parse() with a string, and I want to get My Entity instance from the key I get from Key.Parse()

• Extensions methods in System namespace : this is a real problem

I'm not able to compile, because we have our own Stream.CopyTo() extension method.

Every C# file has an 'using System' at the start : we can't remove it. So the use of your extension methods is mandatory, if we have a reference to Xtensive.Core This not acceptable for a library : how are we supposed to do if every third party library has it own extensions methods in System?

This is very confusing: if I want to have my own extension method, I will not be able to tell explicitly in my code to the other devs in the team that this is the method to use, not your method.

Worse : you are actually potentially incompatible with other third party libraries. If they define exactly the same extension methods with the same signature, this will prevent compilation.

I suggest :

• That you put extension methods concerning your own types (like TupleExtensions, ...) in some namespace you own (Xtensive.Core ?)
• That you put extension methods concerning framework types (like StreamExtensions, StringExtensions, ...) in some special namespace (Xtensive.Core.Extension ?)

I'm waiting for your feedback on those topics.

Regards,

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